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Liu S, Luo H, Trevathan-Tackett SM, Liang J, Wang L, Zhang X, Ren Y, Jiang Z, Wu Y, Zhao C, Huang X. Nutrient-loaded seagrass litter experiences accelerated recalcitrant organic matter decay. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 953:176251. [PMID: 39277004 DOI: 10.1016/j.scitotenv.2024.176251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2024] [Revised: 09/11/2024] [Accepted: 09/11/2024] [Indexed: 09/17/2024]
Abstract
High coastal nutrient loading can cause changes in seagrass chemistry traits that may lead to variability in seagrass litter decomposition processes. Such changes in decomposition have the potential to alter the carbon (C) sequestration capacity within seagrass meadows ('blue carbon'). However, the external and internal factors that drive the variability in decomposition rates of the different organic matter (OM) types of seagrass are poorly understood, especially recalcitrant OM (i.e. cellulose-associated OM and lignin-associated OM), thereby limiting our ability to evaluate the C sequestration potential. It was conducted a laboratory incubation to compare differences in the decomposition of Halophila beccarii litter collected from seagrass meadows with contrasting nutrient loading histories. The exponential decay constants of seagrass litter mass, cellulose-associated OM and lignin-associated OM were 0.009-0.032, 0.014-0.054 and 0.009-0.033 d-1, respectively. The seagrass litter collected from meadows with high nutrient loading exhibited greater losses of mass (25.0-41.2 %), cellulose-associated OM (2.8-18.5 %) and lignin-associated OM (9.6-31.2 %) than litter from relatively low nutrient loading meadows. The initial and temporal changes of the litter nitrogen (N) and phosphorus (P) concentrations, stoichiometric ratios of lignin/N, C/N, and C/P, and cellulose-associated OM content, were strongly correlated with the losses of litter mass and different types of OM. Further, temporal changes of litter C and OM types, particularly the OM and labile OM concentrations, were identified as the main driving factors for the loss of litter mass and loss of different OM types. These results indicated that nutrient-loaded seagrass litter, characterized by elevated nutrient levels and diminished amounts of recalcitrant OM, exhibits an accelerated decay rate for the recalcitrant OM. These differences in litter quality would lead to a reduced contribution of seagrass litter to long-term C stocks in eutrophic meadows, thereby weakening the stability of C sequestration. Considering the expected changes in seagrass litter chemistry traits and decay rates due to long-term nutrient loading, this study provides useful information for improving C sequestration capabilities through effective pollution management.
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Affiliation(s)
- Songlin Liu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongxue Luo
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Stacey M Trevathan-Tackett
- Deakin Marine Research and Innovation Centre, School of Life and Environmental Sciences, Deakin University, Burwood, Victoria 3125, Australia; Biosciences and Food Technology Discipline, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Jiening Liang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lifeng Wang
- Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, School of Life Sciences, Taizhou University, Taizhou 318000, China
| | - Xia Zhang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
| | - Yuzheng Ren
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhijian Jiang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunchao Wu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
| | - Chunyu Zhao
- College of Ecology, Resources and Environment, Dezhou University, Dezhou 253023, China
| | - Xiaoping Huang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Chen H, Luo A, Mi C, Lu Y, Xue Y, Jin L, Zhang H, Yang J. Climate-driven decline in water level causes earlier onset of hypoxia in a subtropical reservoir. WATER RESEARCH 2024; 267:122445. [PMID: 39316965 DOI: 10.1016/j.watres.2024.122445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Revised: 09/11/2024] [Accepted: 09/12/2024] [Indexed: 09/26/2024]
Abstract
Hypoxia, especially in the bottom water, is occurring in deep and stratified reservoirs worldwide, threatening aquatic biodiversity, ecosystem functions and services. However, little is known about the timing of onset and ending of hypoxia, especially in subtropical reservoirs. Based on five-year (from April 2015 to January 2020) sampling of a subtropical monomictic deep reservoir (Tingxi Reservoir) in southeast China, we found the evidence of about 40 days earlier onset of hypolimnion hypoxia during low water level periods in dry years compared to wetter high water level years. We explored the effects of stratification and mixing conditions on hypoxia, cyanobacterial biomass, and nutrient dynamics; and revealed the physical and biochemical conditions that drove hypoxia. The results indicated that 1) The decline in water level increased the intensity of thermal stratification, resulting in 40 days earlier onset of hypolimnion hypoxia in dry years than in wet years; 2) The decline in water level expanded the extent of hypoxia by promoting nutrient accumulation and phytoplankton biomass growth; 3) Warmer climate and less precipitation (drought) significantly promoted the risk of hypoxic expansion and endogenous phosphorus release in subtropical reservoirs. We suggest that more attention needs to be paid to the early onset of hypoxia and its consequences on water quality in subtropical stratified reservoirs during low water level periods in a changing climate.
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Affiliation(s)
- Huihuang Chen
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Anqi Luo
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chenxi Mi
- Helmholtz Centre for Environmental Research, Department of Lake Research, Magdeburg 39114, Germany
| | - Yifan Lu
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuanyuan Xue
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Lei Jin
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Life Sciences, Hebei University, Baoding 071002, China
| | - Hongteng Zhang
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Jun Yang
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
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Chakrawal A, Lindahl BD, Manzoni S. Modelling optimal ligninolytic activity during plant litter decomposition. THE NEW PHYTOLOGIST 2024; 243:866-880. [PMID: 38343140 DOI: 10.1111/nph.19572] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 01/22/2024] [Indexed: 07/05/2024]
Abstract
A large fraction of plant litter comprises recalcitrant aromatic compounds (lignin and other phenolics). Quantifying the fate of aromatic compounds is difficult, because oxidative degradation of aromatic carbon (C) is a costly but necessary endeavor for microorganisms, and we do not know when gains from the decomposition of aromatic C outweigh energetic costs. To evaluate these tradeoffs, we developed a litter decomposition model in which the aromatic C decomposition rate is optimized dynamically to maximize microbial growth for the given costs of maintaining ligninolytic activity. We tested model performance against > 200 litter decomposition datasets collected from published literature and assessed the effects of climate and litter chemistry on litter decomposition. The model predicted a time-varying ligninolytic oxidation rate, which was used to calculate the lag time before the decomposition of aromatic C is initiated. Warmer conditions increased decomposition rates, shortened the lag time of aromatic C oxidation, and improved microbial C-use efficiency by decreasing the costs of oxidation. Moreover, a higher initial content of aromatic C promoted an earlier start of aromatic C decomposition under any climate. With this contribution, we highlight the application of eco-evolutionary approaches based on optimized microbial life strategies as an alternative parametrization scheme for litter decomposition models.
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Affiliation(s)
- Arjun Chakrawal
- Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, 10691, Stockholm, Sweden
| | - Björn D Lindahl
- Swedish University of Agricultural Sciences, Department of Soil and Environment, 75007, Uppsala, Sweden
| | - Stefano Manzoni
- Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, 10691, Stockholm, Sweden
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Yang L, Chen TY, Li ZY, Muhammad I, Chi YX, Zhou XB. Straw incorporation and nitrogen fertilization regulate soil quality, enzyme activities and maize crop productivity in dual maize cropping system. BMC PLANT BIOLOGY 2024; 24:729. [PMID: 39080585 PMCID: PMC11289928 DOI: 10.1186/s12870-024-05451-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Accepted: 07/23/2024] [Indexed: 08/02/2024]
Abstract
BACKGROUND Straw incorporation serves as an effective strategy to enhance soil fertility and soil microbial biomass carbon (SMBC), which in turn improves maize yield and agricultural sustainability. However, our understanding of nitrogen (N) fertilization and straw incorporation into soil microenvironment is still evolving. This study explored the impact of six N fertilization rates (N0, N100, N150, N200, N250, and N300) with and without straw incorporation on soil fertility, SMBC, enzyme activities, and maize yield. RESULTS Results showed that both straw management and N fertilization significantly affected soil organic carbon (SOC), total N, SMBC, soil enzyme activities, and maize yield. Specifically, the N250 treatment combined with straw incorporation significantly increased SOC, total N, and SMBC compared to lower fertilization rates. Additionally, enzyme activities such as urease, cellulase, sucrose, catalase, and acid phosphatase reached their peak during the V6 growth stage in the N200 treatment under for both straw management conditions. Compared to N250 and N300 treatments of traditional planting, the N200 treatment with residue incorporation significantly increased yield by 8.30 and 4.22%, respectively. All measured parameters, except for cellulase activity, were significantly higher in spring than in the autumn across both study years, with notable increases observed in 2021. CONCLUSIONS These findings suggest that optimal levels of SOC, soil total N (STN), and SMBC, along with increased soil enzyme activities, is crucial for sustaining soil fertility and enhancing maize grain yield under straw incorporation and N200 treatments.
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Affiliation(s)
- Li Yang
- Guangxi Key Laboratory of Agro-environment and Agro-products Safety, Key Laboratory of Crop Cultivation and Physiology, College of Agriculture, Guangxi University, Nanning, 530004, China
| | - Teng Yan Chen
- Guangxi Key Laboratory of Agro-environment and Agro-products Safety, Key Laboratory of Crop Cultivation and Physiology, College of Agriculture, Guangxi University, Nanning, 530004, China
| | - Zhong Yi Li
- Agricultural Resources and Environmental Research Institute, Guangxi Key Laboratory of Arable Land Conservation, Guangxi Academy of Agricultural Sciences, Nanning, 530004, China
| | - Ihsan Muhammad
- Guangxi Key Laboratory of Agro-environment and Agro-products Safety, Key Laboratory of Crop Cultivation and Physiology, College of Agriculture, Guangxi University, Nanning, 530004, China
| | - Yu Xin Chi
- Guangxi Key Laboratory of Agro-environment and Agro-products Safety, Key Laboratory of Crop Cultivation and Physiology, College of Agriculture, Guangxi University, Nanning, 530004, China
| | - Xun Bo Zhou
- Guangxi Key Laboratory of Agro-environment and Agro-products Safety, Key Laboratory of Crop Cultivation and Physiology, College of Agriculture, Guangxi University, Nanning, 530004, China.
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Luo C, Wu Y, He Q, Wang J, Bing H. Microbial nutrient limitation and carbon use efficiency changes under different degrees of litter decomposition. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:328. [PMID: 39012544 DOI: 10.1007/s10653-024-02115-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 07/02/2024] [Indexed: 07/17/2024]
Abstract
Alpine ecosystems are important terrestrial carbon (C) pools, and microbial decomposers play a key role in litter decomposition. Microbial metabolic limitations in these ecosystems, however, remain unclear. The objectives of this study aim to elucidate the characteristics of microbial nutrient limitation and their C use efficiency (CUE), and to evaluate their response to environmental factors. Five ecological indicators were utilized to assess and compare the degree of microbial elemental homeostasis and the nutrient limitations of the microbial communities among varying stages of litter decomposition (L, F, and H horizon) along an altitudinal gradient (2800, 3000, 3250, and 3500 m) under uniform vegetation (Abies fabri) on Gongga Mountain, eastern Tibetan Plateau. In this study, microorganisms in the litter reached a strictly homeostatic of C content exclusively during the middle stage of litter decomposition (F horizon). Based on the stoichiometry of soil enzymes, we observed that microbial N- and P-limitation increased during litter degradation, but that P-limitation was stronger than N-limitation at the late stages of degradation (H horizon). Furthermore, an increase in microbial CUE corresponded with a reduction in microbial C-limitation. Additionally, redundancy analysis (RDA) based on forward selection further showed that microbial biomass C (MBC) is closely associated with the enzyme activities and their ratios, and MBC was also an important factor in characterizing changes in microbial nutrient limitation and CUE. Our findings suggest that variations in MBC, rather than N- and P-related components, predominantly influence microbial metabolic processes during litter decomposition on Gongga Mountain, eastern Tibetan Plateau.
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Affiliation(s)
- Chaoyi Luo
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610299, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yanhong Wu
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610299, China.
| | - Qingqing He
- School of Emergency Management, Xihua University, Chengdu, 610039, China
| | - Jipeng Wang
- CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Haijian Bing
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610299, China
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Choreño-Parra EM, Treseder KK. Mycorrhizal fungi modify decomposition: a meta-analysis. THE NEW PHYTOLOGIST 2024; 242:2763-2774. [PMID: 38605488 DOI: 10.1111/nph.19748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Accepted: 03/22/2024] [Indexed: 04/13/2024]
Abstract
It has been proposed that ectomycorrhizal fungi can reduce decomposition while arbuscular mycorrhizal fungi may enhance it. These phenomena are known as the 'Gadgil effect' and 'priming effect', respectively. However, it is unclear which one predominates globally. We evaluated whether mycorrhizal fungi decrease or increase decomposition, and identified conditions that mediate this effect. We obtained decomposition data from 43 studies (97 trials) conducted in field or laboratory settings that controlled the access of mycorrhizal fungi to substrates colonized by saprotrophs. Across studies, mycorrhizal fungi promoted decomposition of different substrates by 6.7% overall by favoring the priming effect over the Gadgil effect. However, we observed significant variation among studies. The substrate C : N ratio and absolute latitude influenced the effect of mycorrhizal fungi on decomposition and contributed to the variation. Specifically, mycorrhizal fungi increased decomposition at low substrate C : N and absolute latitude, but there was no discernable effect at high values. Unexpectedly, the effect of mycorrhizal fungi was not influenced by the mycorrhizal type. Our findings challenge previous assumptions about the universality of the Gadgil effect but highlight the potential of mycorrhizal fungi to negatively influence soil carbon storage by promoting the priming effect.
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Affiliation(s)
- Eduardo M Choreño-Parra
- Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, CA, 92697, USA
| | - Kathleen K Treseder
- Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, CA, 92697, USA
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Tian K, Chen S, Ye R, Xie Y, Yao L, Lin H. Initial microbiome and tree root status structured the soil microbial community discrepancy of the subtropical pine-oak forest in a large urban forest park. Front Microbiol 2024; 15:1391863. [PMID: 38881652 PMCID: PMC11176443 DOI: 10.3389/fmicb.2024.1391863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 05/06/2024] [Indexed: 06/18/2024] Open
Abstract
Plant-microbe-soil interactions control over the forest biogeochemical cycling. Adaptive plant-soil interactions can shape specific microbial taxa in determining the ecosystem functioning. Different trees produce heterogeneous soil properties and can alter the composition of soil microbial community, which is relevant to the forest internal succession containing contrasting stand types such as the pine-oak forests. Considering representative microbial community characteristics are recorded in the original soil where they had adapted and resided, we constructed a soil transplant incubation experiment in a series of in situ root-ingrowth cores in a subtropical pine-oak forest, to simulate the vegetational pine-oak replacement under environmental succession. The responsive bacterial and fungal community discrepancies were studied to determine whether and how they would be changed. The pine and oak forest stands had greater heterogeneity in fungi composition than bacteria. Original soil and specific tree root status were the main factors that determined microbial community structure. Internal association network characters and intergroup variations of fungi among soil samples were more affected by original soil, while bacteria were more affected by receiving forest. Specifically, dominant tree roots had strong influence in accelerating the fungi community succession to adapt with the surrounding forest. We concluded that soil microbial responses to forest stand alternation differed between microbiome groups, with fungi from their original forest possessing higher resistance to encounter a new vegetation stand, while the bacteria community have faster resilience. The data would advance our insight into local soil microbial community dynamics during ecosystem succession and be helpful to enlighten forest management.
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Affiliation(s)
- Kai Tian
- Henan Field Observation and Research Station of Headwork Wetland Ecosystem of the Central Route of South-to-North Water Diversion Project, School of Life Sciences and Agricultural Engineering, Nanyang Normal University, Nanyang, China
| | - Shaoming Chen
- Henan Field Observation and Research Station of Headwork Wetland Ecosystem of the Central Route of South-to-North Water Diversion Project, School of Life Sciences and Agricultural Engineering, Nanyang Normal University, Nanyang, China
| | - Rumeng Ye
- Henan Field Observation and Research Station of Headwork Wetland Ecosystem of the Central Route of South-to-North Water Diversion Project, School of Life Sciences and Agricultural Engineering, Nanyang Normal University, Nanyang, China
| | - Yanghe Xie
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Lunguang Yao
- Henan Field Observation and Research Station of Headwork Wetland Ecosystem of the Central Route of South-to-North Water Diversion Project, School of Life Sciences and Agricultural Engineering, Nanyang Normal University, Nanyang, China
| | - Hong Lin
- School of Food Science, Institute of Applied Ecology, Nanjing Xiaozhuang University, Nanjing, China
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Gao Y, Tariq A, Zeng F, Sardans J, Graciano C, Li X, Wang W, Peñuelas J. Soil microbial functional profiles of P-cycling reveal drought-induced constraints on P-transformation in a hyper-arid desert ecosystem. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 925:171767. [PMID: 38499102 DOI: 10.1016/j.scitotenv.2024.171767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 03/20/2024]
Abstract
Soil water conditions are known to influence soil nutrient availability, but the specific impact of different conditions on soil phosphorus (P) availability through the modulation of P-cycling functional microbial communities in hyper-arid desert ecosystems remains largely unexplored. To address this knowledge gap, we conducted a 3-year pot experiment using a typical desert plant species (Alhagi sparsifolia Shap.) subjected to two water supply levels (25 %-35 % and 65 %-75 % of maximum field capacity, MFC) and four P-supply levels (0, 1, 3, and 5 g P m-2 y-1). Our investigation focused on the soil Hedley-P pool and the four major microbial groups involved in the critical phases of soil microbial P-cycling. The results revealed that the drought (25 %-35 % MFC) and no P-supply treatments reduced soil resin-P and NaHCO3-Pi concentrations by 87.03 % and 93.22 %, respectively, compared to the well-watered (65 %-75 % MFC) and high P-supply (5 g P m-2 y-1) treatments. However, the P-supply treatment resulted in a 12 %-22 % decrease in the soil NH4+-N concentration preferred by microbes compared to the no P-supply treatment. Moreover, the abundance of genes engaged in microbial P-cycling (e.g. gcd and phoD) increased under the drought and no P-supply treatments (p < 0.05), suggesting that increased NH4+-N accumulation under these conditions may stimulate P-solubilizing microbes, thereby promoting the microbial community's investment in resources to enhance the P-cycling potential. Furthermore, the communities of Steroidobacter cummioxidans, Mesorhizobium alhagi, Devosia geojensis, and Ensifer sojae, associated with the major P-cycling genes, were enriched in drought and no or low-P soils. Overall, the drought and no or low-P treatments stimulated microbial communities and gene abundances involved in P-cycling. However, this increase was insufficient to maintain soil P-bioavailability. These findings shed light on the responses and feedback of microbial-mediated P-cycling behaviors in desert ecosystems under three-year drought and soil P-deficiency.
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Affiliation(s)
- Yanju Gao
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele 848300, China
| | - Akash Tariq
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele 848300, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Fanjiang Zeng
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele 848300, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Jordi Sardans
- CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain
| | - Corina Graciano
- Instituto de Fisiología Vegetal, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata, Buenos Aires, Argentina
| | - Xiangyi Li
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele 848300, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weiqi Wang
- Key Laboratory of Humid Subtropical Ecological-Geographical Processes, Ministry of Education, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Josep Peñuelas
- CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain
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Shamshitov A, Kadžienė G, Supronienė S. The Role of Soil Microbial Consortia in Sustainable Cereal Crop Residue Management. PLANTS (BASEL, SWITZERLAND) 2024; 13:766. [PMID: 38592825 PMCID: PMC10974107 DOI: 10.3390/plants13060766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 03/05/2024] [Accepted: 03/06/2024] [Indexed: 04/11/2024]
Abstract
The global escalation in cereal production, essential to meet growing population demands, simultaneously augments the generation of cereal crop residues, estimated annually at approximately 3107 × 106 Mg/year. Among different crop residue management approaches, returning them to the soil can be essential for various ecological benefits, including nutrient recycling and soil carbon sequestration. However, the recalcitrant characteristics of cereal crop residues pose significant challenges in their management, particularly in the decomposition rate. Therefore, in this review, we aim to summarize the influence of different agricultural practices on enhancing soil microbial decomposer communities, thereby effectively managing cereal crop residues. Moreover, this manuscript provides indirect estimates of cereal crop residue production in Northern Europe and Lithuania, and highlights the diverse roles of lignocellulolytic microorganisms in the decomposition process, with a particular focus on enzymatic activities. This review bridges the knowledge gap and indicates future research directions concerning the influence of agricultural practices on cereal crop residue-associated microbial consortia.
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Affiliation(s)
- Arman Shamshitov
- Laboratory of Microbiology, Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Instituto al. 1, Akademija, LT-58344 Kedainiai, Lithuania;
| | - Gražina Kadžienė
- Department of Soil and Crop Management, Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Instituto al. 1, Akademija, LT-58344 Kedainiai, Lithuania
| | - Skaidrė Supronienė
- Laboratory of Microbiology, Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Instituto al. 1, Akademija, LT-58344 Kedainiai, Lithuania;
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Cui H, He C, Zheng W, Jiang Z, Yang J. Effects of nitrogen addition on rhizosphere priming: The role of stoichiometric imbalance. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 914:169731. [PMID: 38163589 DOI: 10.1016/j.scitotenv.2023.169731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 12/24/2023] [Accepted: 12/26/2023] [Indexed: 01/03/2024]
Abstract
Nitrogen (N) input has a significant impact on the availability of carbon (C), nitrogen (N), and phosphorus (P) in the rhizosphere, leading to an imbalanced stoichiometry in microbial demands. This imbalance can result in energy or nutrient limitations, which, in turn, affect C dynamics during plant growth. However, the precise influence of N addition on the C:N:P imbalance ratio and its subsequent effects on rhizosphere priming effects (RPEs) remain unclear. To address this gap, we conducted a 75-day microcosm experiment, varying N addition rates (0, 150, 300 kg N ha-1), to examine how microbes regulate RPE by adapting to stoichiometry and maintaining homeostasis in response to N addition, using the 13C natural method. Our result showed that N input induced a stoichiometric imbalance in C:N:P, leading to P or C limitation for microbes during plant growth. Microbes responded by adjusting enzymatic stoichiometry and functional taxa to preserve homeostasis, thereby modifying the threshold element ratios (TERs) to cope with the C:N:P imbalance. Microbes adapted to the stoichiometric imbalance by reducing TER, which was attributed to a reduction in carbon use efficiency. Consequently, we observed higher RPE under P limitation, whereas the opposite trend was observed under C or N limitation. These results offer novel insights into the microbial regulation of RPE variation under different soil nutrient conditions and contribute to a better understanding of soil C dynamics.
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Affiliation(s)
- Hao Cui
- Institute of Environment Pollution Control and Treatment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Chao He
- Institute of Environment Pollution Control and Treatment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Weiwei Zheng
- Institute of Environment Pollution Control and Treatment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Zhenhui Jiang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China.
| | - Jingping Yang
- Institute of Environment Pollution Control and Treatment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China.
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11
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Yu Z, Zhang C, Liu X, Lei J, Zhang Q, Yuan Z, Peng C, Koerner SE, Xu J, Guo L. Responses of C:N:P stoichiometric correlations among plants, soils and microorganisms to warming: A meta-analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168827. [PMID: 38030014 DOI: 10.1016/j.scitotenv.2023.168827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 12/01/2023]
Abstract
Plants, soils and microorganisms play important roles in maintaining stable terrestrial stoichiometry. Studying how nutrient balances of these biotic and abiotic players vary across temperature gradients is important when predicting ecosystem changes on a warming planet. The respective responses of plant, soil and microbial stoichiometric ratios to warming have been observed, however, whether and how the stoichiometric correlations among the three components shift under warming has not been clearly understood and identified. In the present study, we have performed a meta-analysis based on 600 case studies from 74 sites or locations to clarify whether and how warming affects plant, soil and microbial stoichiometry, respectively, and their correlations. Our results indicated that: (1) globally, plants had higher C:N and C:P values compared to soil and microbial pools, but their N:P distributions were similar; (2) warming did not significantly alter plant, soil and microbial C:N and C:P values, but had a noticeable effect on plant N:P ratios. When ecosystem types, duration and magnitude of warming were taken into account, there was an inconsistent and even inverse warming response in terms of the direction and magnitude of changes in the C:N:P ratios occurring among plants, soils and microorganisms; (3) despite various warming responses of the stoichiometric ratios detected separately for plants, soils and microorganisms, the stoichiometric correlations among all three parts remained constant even under different warming scenarios. Our study highlighted the complexity of the effect of warming on the C:N:P stoichiometry, as well as the absence and importance of simultaneous measurements of stoichiometric ratios across different components of terrestrial ecosystems, which should be urgently strengthened in future studies.
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Affiliation(s)
- Zongkai Yu
- College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China
| | - Chao Zhang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Xiaowei Liu
- College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China
| | - Jichu Lei
- The Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiang Zhang
- College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China
| | - Zhiyou Yuan
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Changhui Peng
- School of Geographic Sciences, Hunan Normal University, Changsha 410081, China; Department of Biology Science, Institute of Environment Sciences, University of Quebec at Montreal, H3C 3P8, Canada
| | - Sally E Koerner
- Department of Biology, University of North Carolina at Greensboro, Greensboro 27402, USA
| | - Jianchu Xu
- Center for Mountain Ecosystem Studies, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; World Agroforestry Center, Nairobi 00100, Kenya
| | - Liang Guo
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China.
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12
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Soldatova E, Krasilnikov S, Kuzyakov Y. Soil organic matter turnover: Global implications from δ 13C and δ 15N signatures. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169423. [PMID: 38128662 DOI: 10.1016/j.scitotenv.2023.169423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 12/13/2023] [Accepted: 12/14/2023] [Indexed: 12/23/2023]
Abstract
The turnover and residence time of carbon (C) and nitrogen (N) in soil is a fundamental parameter reflecting the rates of soil organic matter (SOM) transformation and the contribution of soils to greenhouse gases fluxes. Based on the global database of the stable isotope composition of C (δ13C) and N (δ15N) depending on soil depth (171 profiles), we assessed С and N turnover and related them to climate, biome types and soil properties. The 13C and 15N discrimination between the litter horizon and mineral soil was evaluated to explain the key processes of litter transformation. The 13C and 15N discrimination by microbial utilization of litter and SOM, as well as the continuous increase of δ13C and δ15N with depth, enabled to assess C and N turnover within SOM. N turnover was two times faster than that of C, which reflects i) repeated N recycling by microorganisms accelerating N turnover, ii) C loss as CO2 and input of new C atoms to cycling, which reduces the C turnover within soil, and iii) generally slower turnover of N free persistent organic compounds (e.g. lignin, suberin, cellulose) compared to the N containing compounds (e.g. amino acids, ribonucleic acids). An increase in temperature and precipitation accelerated C and N turnover because: i) higher microbial activity and SOM decomposition rate, ii) larger soil moisture and fast diffusion of dissolved organics towards exoenzymes, iii) downward transport of 13C-enriched organic matter (e.g. sugars, amino acids), and iii) leaching of 15N-depleted nitrates from the topsoil into subsoil and losses from the whole soil profile. Temperature accelerates SOM turnover stronger than precipitation. The temperature increase by 10 °C accelerates the C and N turnover for 40 %. SOM turnover is boosted by decreasing C/N ratio because: i) SOM with a high C/N ratio originated from litter is converted to microbially-derived SOM in mineral soil characterized by a low C/N ratio; ii) litter with a low C/N ratio is decomposed faster than litter with a high C/N; iii) microbial carbon-use efficiency increases with N availability. The biome type affects SOM decomposition by i) climate: slower turnover under wet and cold conditions, and ii) by litter quality: faster utilization of leaves than needles. Thus, the fastest C turnover is common under evergreen forests and the lowest under mixed and coniferous ones, whereas temperature and C/N ratio are the main factors controlling SOM turnover. Concluding, the assessment of SOM turnover by δ13C and δ15N approach showed two times faster N turnover compared to C, and specifics of SOM turnover depending on the biomes as well as climate conditions.
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Affiliation(s)
- Evgeniya Soldatova
- Center for Isotope Biogeochemistry, Institute of Environmental and Agricultural Biology (X-BIO), University of Tyumen, 6 Volodarskogo Street, 625003 Tyumen, Russia; Laboratory of Mass Transport, Geological Institute of the Russian Academy of Sciences, 7с1 Pyzhevskiy Pereulok, 119017 Moscow, Russia.
| | - Sergey Krasilnikov
- Department of Land Surveying & Geo-Informatics, Research Centre for Deep Space Explorations, The Hong Kong Polytechnic University, ZN601, 6/F, Phase 8, 181 Chatham Road South, Kowloon, Hong Kong.
| | - Yakov Kuzyakov
- Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, 2 Büsgenweg, 37077 Göttingen, Germany; Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia; Institute of Environmental Sciences, Kazan Federal University, 420049 Kazan, Russia.
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13
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Kaňa J, Kaštovská E, Choma M, Čapek P, Tahovská K, Kopáček J. Undeveloped till soils in scree areas are an overlooked important phosphorus source for waters in alpine catchments. Sci Rep 2023; 13:14725. [PMID: 37679451 PMCID: PMC10485049 DOI: 10.1038/s41598-023-42013-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 09/04/2023] [Indexed: 09/09/2023] Open
Abstract
Scree deposits in alpine catchments contain undeveloped till soils that are "hidden" between and under stones. These scree areas have no vegetation except for sparse lichen patches on stone surfaces, but the soils exhibit biological activity and active cycling of nitrogen (N), phosphorus (P), and organic carbon (C). We compared the chemical and biochemical properties of till soils in the scree areas (scree soils) with developed soils in alpine meadows (meadow soils) of 14 catchments in the alpine zone of the Tatra Mountains. The data showed that scree soils served as an important source of mobile P forms for waters in high elevation catchments. We then conducted a detailed soil survey focused on four selected alpine catchments with scree cover proportions > 30%. This study confirmed that scree soils have significantly higher concentrations of mobile P forms compared to meadow soils, and a high specific microbial activity directed towards the extraction of P with rapid turnover in the microbial biomass. The combination of these properties and the amounts of scree soils in high-elevation areas highlight their importance in overall biogeochemical P cycling in alpine catchments, and the terrestrial P export to receiving waters.
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Affiliation(s)
- Jiří Kaňa
- Institute of Hydrobiology, Biology Centre CAS, Na Sádkách 7, 37005, České Budějovice, Czech Republic.
- Department of Ecosystem Biology, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31a, 370 05, České Budějovice, Czech Republic.
| | - Eva Kaštovská
- Department of Ecosystem Biology, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31a, 370 05, České Budějovice, Czech Republic
| | - Michal Choma
- Department of Ecosystem Biology, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31a, 370 05, České Budějovice, Czech Republic
| | - Petr Čapek
- Department of Ecosystem Biology, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31a, 370 05, České Budějovice, Czech Republic
| | - Karolina Tahovská
- Department of Ecosystem Biology, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31a, 370 05, České Budějovice, Czech Republic
| | - Jiří Kopáček
- Institute of Hydrobiology, Biology Centre CAS, Na Sádkách 7, 37005, České Budějovice, Czech Republic
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14
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Robbins CJ, Manning DWP, Halvorson HM, Norman BC, Eckert RA, Pastor A, Dodd AK, Jabiol J, Bastias E, Gossiaux A, Mehring AS. Nutrient and stoichiometry dynamics of decomposing litter in stream ecosystems: A global synthesis. Ecology 2023:e4060. [PMID: 37186091 DOI: 10.1002/ecy.4060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 04/14/2023] [Indexed: 05/17/2023]
Abstract
Decomposing organic matter forms a substantial resource base fueling the biogeochemical function and secondary production of most aquatic ecosystems. However, detrital N (nitrogen) and P (phosphorus) dynamics remain relatively unexplored in aquatic relative to terrestrial ecosystems, despite fundamentally linking microbial processes to ecosystem function across broad spatial scales. We synthesized 217 published time series of detrital carbon (C), N, P, and their stoichiometric ratios (C:N, C:P, N:P) from stream ecosystems to analyze the temporal nutrient dynamics of decomposing litter using generalized additive models. Model results indicated that detritus was a net source of N (irrespective of inorganic or organic form) to the environment regardless of initial N content. In contrast, P sink/source dynamics were more strongly influenced by initial P content, where P-poor litters were sinks of nutrients until shifting to net P mineralization after ~40% mass loss. However, large variation surrounded both N and P predictions, suggesting the importance of non-microbial factors such as fragmentation by invertebrates. Detrital C:N ratios converged and became more similar toward the end of decomposition, suggesting predictable microbial functional effects throughout detrital ontogeny. C:P and N:P ratios also converged to some degree, but these model predictions were less robust than for C:N, due in part to the lower number of published detrital C:P time series. Explorations of environmental covariate effects were frequently limited by few coincident covariate measurements across studies, but temperature, N availability, and P tended to accelerate existing ontogenetic patterns in C:N. Our analysis helps unite organic matter decomposition across aquatic-terrestrial boundaries by describing basic patterns of elemental flows catalyzed by decomposition in streams, and points to a research agenda to continue addressing gaps in our knowledge of detrital nutrient dynamics across ecosystems. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Caleb J Robbins
- Department of Biology, Center for Reservoir and Aquatic Systems Research, Baylor University, Waco, TX, USA
| | - David W P Manning
- Department of Biology, University of Nebraska at Omaha, Omaha, NE, USA
| | | | - Beth C Norman
- Lacawac Sanctuary Field Station and Environmental Education Center, Lake Ariel, PA, USA
| | - Rebecca A Eckert
- Biology Department, Environmental Studies Department, Gettysburg College, Gettysburg, PA, USA
| | - Ada Pastor
- Group of Continental Aquatic Ecology Research (GRECO), Institute of Aquatic Ecology, University of Girona, Girona, Spain
| | - Allyn K Dodd
- Arkansas School for Math, Sciences, and the Arts, Hot Springs, AR, USA
| | - Jérémy Jabiol
- HYFE - Hydrobiologie et Fonctionnement des Ecosystèmes, Elven, France
| | - Elliot Bastias
- Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden
| | | | - Andrew S Mehring
- Department of Biology, University of Louisville, Louisville, KY, USA
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15
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Gao Y, Zhang Z, Zeng F, Ma X. Root morphological and physiological traits are committed to the phosphorus acquisition of the desert plants in phosphorus-deficient soils. BMC PLANT BIOLOGY 2023; 23:188. [PMID: 37032339 PMCID: PMC10084647 DOI: 10.1186/s12870-023-04178-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
BACKGROUND Phosphorus (P) deficiency in desert ecosystems is widespread. Generally, desert species may allocate an enormous proportion of photosynthetic carbon to their root systems to adjust their P-acquisition strategies. However, root P-acquisition strategies of deep-rooted desert species and the coordination response of root traits at different growth stages to differing soil P availability remains unclear. In this study, a two-year pot experiment was performed with four soil P-supply treatments (0, 0.9, 2.8, and 4.7 mg P kg-1 y-1 for the control, low-, intermediate-, and high-P supply, respectively). Root morphological and physiological traits of one- and two-year-old Alhagi sparsifolia seedlings were measured. RESULTS For two-year-old seedlings, control or low-P supply significantly increased their leaf Mn concentration, coarse and fine roots' specific root length (SRL), specific root surface area (SRSA), and acid phosphatase activity (APase), but SRL and SRSA of one-year-old seedlings were higher under intermediate-P supply treatment. Root morphological traits were closely correlated with root APase activity and leaf Mn concentration. One-year-old seedlings had higher root APase activity, leaf Mn concentration, and root tissue density (RTD), but lower SRL and SRSA. Two-year-old seedlings had higher root APase activity, leaf Mn concentration, SRL and SRSA, but a lower RTD. Root APase activity was significantly positively correlated with the leaf Mn concentration, regardless of coarse or fine roots. Furthermore, root P concentrations of coarse and fine roots were driven by different root traits, with root biomass and carboxylates secretion particularly crucial root traits for the root P-acquisition of one- and two-year-old seedlings. CONCLUSIONS Variation of root traits at different growth stages are coordinated with root P concentrations, indicating a trade-off between root traits and P-acquisition strategies. Alhagi sparsifolia developed two P-activation strategies, increasing P-mobilizing phosphatase activity and carboxylates secretion, to acclimate P-impoverished in soil. The adaptive variation of root traits at different growth stages and diversified P-activation strategies are conducive to maintaining the desert ecosystem productivity.
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Affiliation(s)
- Yanju Gao
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
- Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele, 848300, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhihao Zhang
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
- Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele, 848300, China
| | - Fanjiang Zeng
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China.
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China.
- Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele, 848300, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Xingyu Ma
- Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
- State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
- Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele, 848300, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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16
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Yu DW, Duan SJ, Zhang XC, Yin DQ, Wang SJ, Chen JS, Lei NF. Effects of nutrient supply on leaf stoichiometry and relative growth rate of three stoloniferous alien plants. PLoS One 2022; 17:e0278656. [PMID: 36459510 PMCID: PMC9718409 DOI: 10.1371/journal.pone.0278656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 11/21/2022] [Indexed: 12/04/2022] Open
Abstract
Different nutrient supply brings about changes in leaf stoichiometry, which may affect growth rate and primary production of plants. Invasion of alien plants is a severe threat to biodiversity and ecosystem worldwide. A pot experiment was conducted by using three stoloniferous alien plants Wedelia trilobata, Alternanther philoxeroides and Hydrocotyle vulgaris to investigate effects of nutrient supply on their leaf stoichiometry and relative growth rate. Different nitrogen or phosphorus supply was applied in the experiment (N1:1 mmol L-1, N2:4 mmol L-1, and N3:8 mmol L-1, P1:0.15 mmol L-1, P2:0.6 mmol L-1 and P3:1.2 mmol L-1). Nitrogen and phosphorus concentrations in leaves of the three alien plants significantly increased with increase of nitrogen supply. With increase of phosphorus supply, nitrogen or phosphorus concentration of leaf was complex among the three alien plants. N:P ratio in leaf of the three alien plants subjected to different levels of nutrient supply was various. A positive correlation between relative growth rate and N:P ratio of the leaf is observed in W. trilobata and A. philoxeroides suffering from N-limitation. A similar pattern was not observed in Hydrocotyle vulgaris. We tentatively concluded that correlations between relative growth rate and N: P ratio of the leaf could be affected by species as well as nutrient supply. It is suggested that human activities, invasive history, local abundance of species et al maybe play an important role in the invasion of alien plants as well as relative growth rate.
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Affiliation(s)
- Dong-Wei Yu
- College of Life Science, Sichuan Normal University, Chengdu, China
| | - Su-Juan Duan
- College of Life Science, Sichuan Normal University, Chengdu, China
| | - Xiao- Chao Zhang
- College of Ecology and Environment, Chengdu University of Technology, Chengdu, China
| | - Da-Qiu Yin
- China Huaneng Group Co., Ltd, Beijing, China
| | | | - Jin-Song Chen
- College of Life Science, Sichuan Normal University, Chengdu, China
- * E-mail: (J-SC); (N-FL)
| | - Ning-Fei Lei
- College of Ecology and Environment, Chengdu University of Technology, Chengdu, China
- * E-mail: (J-SC); (N-FL)
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17
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Watmough S, Gilbert-Parkes S, Basiliko N, Lamit LJ, Lilleskov EA, Andersen R, del Aguila-Pasquel J, Artz RE, Benscoter BW, Borken W, Bragazza L, Brandt SM, Bräuer SL, Carson MA, Chen X, Chimner RA, Clarkson BR, Cobb AR, Enriquez AS, Farmer J, Grover SP, Harvey CF, Harris LI, Hazard C, Hoyt AM, Hribljan J, Jauhiainen J, Juutinen S, Kane ES, Knorr KH, Kolka R, Könönen M, Laine AM, Larmola T, Levasseur PA, McCalley CK, McLaughlin J, Moore TR, Mykytczuk N, Normand AE, Rich V, Robinson B, Rupp DL, Rutherford J, Schadt CW, Smith DS, Spiers G, Tedersoo L, Thu PQ, Trettin CC, Tuittila ES, Turetsky M, Urbanová Z, Varner RK, Waldrop MP, Wang M, Wang Z, Warren M, Wiedermann MM, Williams ST, Yavitt JB, Yu ZG, Zahn G. Variation in carbon and nitrogen concentrations among peatland categories at the global scale. PLoS One 2022; 17:e0275149. [PMID: 36417456 PMCID: PMC9683585 DOI: 10.1371/journal.pone.0275149] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 09/12/2022] [Indexed: 11/25/2022] Open
Abstract
Peatlands account for 15 to 30% of the world's soil carbon (C) stock and are important controls over global nitrogen (N) cycles. However, C and N concentrations are known to vary among peatlands contributing to the uncertainty of global C inventories, but there are few global studies that relate peatland classification to peat chemistry. We analyzed 436 peat cores sampled in 24 countries across six continents and measured C, N, and organic matter (OM) content at three depths down to 70 cm. Sites were distinguished between northern (387) and tropical (49) peatlands and assigned to one of six distinct broadly recognized peatland categories that vary primarily along a pH gradient. Peat C and N concentrations, OM content, and C:N ratios differed significantly among peatland categories, but few differences in chemistry with depth were found within each category. Across all peatlands C and N concentrations in the 10-20 cm layer, were 440 ± 85.1 g kg-1 and 13.9 ± 7.4 g kg-1, with an average C:N ratio of 30.1 ± 20.8. Among peatland categories, median C concentrations were highest in bogs, poor fens and tropical swamps (446-532 g kg-1) and lowest in intermediate and extremely rich fens (375-414 g kg-1). The C:OM ratio in peat was similar across most peatland categories, except in deeper samples from ombrotrophic tropical peat swamps that were higher than other peatlands categories. Peat N concentrations and C:N ratios varied approximately two-fold among peatland categories and N concentrations tended to be higher (and C:N lower) in intermediate fens compared with other peatland types. This study reports on a unique data set and demonstrates that differences in peat C and OM concentrations among broadly classified peatland categories are predictable, which can aid future studies that use land cover assessments to refine global peatland C and N stocks.
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Affiliation(s)
- Shaun Watmough
- Trent University, School of the Environment, Peterborough, Ontario, Canada
- * E-mail:
| | | | - Nathan Basiliko
- Department of Biology and the Vale Living with Lakes Centre, Laurentian University, Sudbury, Ontario, Canada
| | - Louis J. Lamit
- Department of Biology, Syracuse University, Syracuse, NY, United States of America
| | - Erik A. Lilleskov
- USDA Forest Service, Northern Research Station, Houghton, MI, United States of America
| | - Roxanne Andersen
- Environmental Research Institute, University of the Highlands and Islands, Castle St., United Kingdom
| | | | - Rebekka E. Artz
- Ecological Sciences, James Hutton Institute, Castle St., Aberdeen, United Kingdom
| | - Brian W. Benscoter
- Department of Biological Sciences, Florida Atlantic University, Boca Raton, FL, United States of America
| | - Werner Borken
- University Bayreuth, Soil Ecology, Bayreuth, Germany
| | - Luca Bragazza
- Department of Life Science and Biotechnologies, University of Ferrara, Ferrara, Italy
| | - Stefani M. Brandt
- Department of Biological Sciences, Arcata, CA, United States of America
| | - Suzanna L. Bräuer
- Department of Biology, Appalachian State University, Boone, NC, United States of America
| | - Michael A. Carson
- Department of Biology and the Vale Living with Lakes Centre, Laurentian University, Sudbury, Ontario, Canada
| | - Xin Chen
- Zhejiang University, College of Life Sciences, Hangzhou, China
| | - Rodney A. Chimner
- Department of Biology, Syracuse University, Syracuse, NY, United States of America
| | | | - Alexander R. Cobb
- Center for Environmental Sensing and Modeling, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
| | - Andrea S. Enriquez
- Instituto de Investigaciones Forestales y Agropecuarias (CONICET-INTA), Río Negro, Argentina
| | - Jenny Farmer
- School of Natural and Environmental Sciences, Newcastle University, Newcastle, United Kingdom
| | - Samantha P. Grover
- RMIT University, Applied Chemistry and Environmental Science, Melbourne, VIC, Australia
| | - Charles F. Harvey
- Massachusetts Institute of Technology and Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
| | - Lorna I. Harris
- Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada
| | - Christina Hazard
- École Centrale de Lyon, Université de Lyon, Environmental Microbial Genomics, Laboratoire Ampère, Ecully, France
| | - Alison M. Hoyt
- Massachusetts Institute of Technology, Cambridge, MA, United States of America
| | - John Hribljan
- Department of Biology, University of Nebraska Omaha, Omaha, NE, United States of America
| | - Jyrki Jauhiainen
- University of Helsinki, Helsinki, Finland
- Natural Resources Institute Finland, Helsinki, Finland
| | - Sari Juutinen
- Ecosystems and Environment Research Program, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Evan S. Kane
- Department of Biology, Syracuse University, Syracuse, NY, United States of America
| | - Klaus-Holger Knorr
- Institute of Landscape Ecology, Ecohydrology & Biogeochemistry Group, University of Muenster, Muenster, Germany
| | - Randy Kolka
- USDA Forest Service, Northern Research Station, Grand Rapids, MI, United States of America
| | - Mari Könönen
- University of Helsinki, Helsinki, Finland
- Natural Resources Institute Finland, Helsinki, Finland
| | | | - Tuula Larmola
- Natural Resources Institute Finland, Helsinki, Finland
| | | | - Carmody K. McCalley
- Rochester Institute of Technology, Gosnell School of Life Sciences, Rochester, NY, United States of America
| | - Jim McLaughlin
- Ontario Forest Research Institute, Sault Ste. Marie, ON, United States of America
| | - Tim R. Moore
- Department of Geography, McGill University, Montreal, Canada
| | - Nadia Mykytczuk
- Laurentian University, School of the Environment and the Vale Living with Lakes Centre, Sudbury, Ontario, Canada
| | - Anna E. Normand
- University of Florida, Soil and Water Sciences, Gainesville, Florida
| | - Virginia Rich
- Department of Microbiology, Ohio State University, Columbus, OH, United States of America
| | - Bryce Robinson
- Department of Biology and the Vale Living with Lakes Centre, Laurentian University, Sudbury, Ontario, Canada
| | - Danielle L. Rupp
- Department of Biology, Syracuse University, Syracuse, NY, United States of America
| | - Jasmine Rutherford
- Department of Biodiversity, Conservation and Attractions, Kensington, W.A., Australia
| | - Christopher W. Schadt
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States of America
| | - Dave S. Smith
- Department of Biology, California State University San Bernardino, San Bernardino, CA, United States of America
| | - Graeme Spiers
- Department of Biology and the Vale Living with Lakes Centre, Laurentian University, Sudbury, Ontario, Canada
| | - Leho Tedersoo
- Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
- College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Pham Q. Thu
- Forest Protection Research Centre, Vietnamese Academy of Forest Sciences, Hanoi City, Vietnam
| | - Carl C. Trettin
- USDA Forest Service, Southern Research Station, Cordesville, SC, United States of America
| | | | - Merritt Turetsky
- INSTAAR, University of Colorado, Boulder, CO, United States of America
| | - Zuzana Urbanová
- Department of Ecosystem Biology, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic
| | - Ruth K. Varner
- Department of Earth Science and Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States of America
| | - Mark P. Waldrop
- Geology, Minerals, Energy, and Geophysics Science Center, USGS Menlo Park, Menlo Park, CA, United States of America
| | - Meng Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Institute for Peat and Mire Research, Northeast Normal University, Changchun, Jilin, China
| | - Zheng Wang
- College of Forestry, Hebei Agricultural University, Baoding, Hebei, China
| | - Matt Warren
- Earth Innovation Institute, San Francisco, CA, United States of America
| | - Magdalena M. Wiedermann
- Departments of Biological Sciences, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Shanay T. Williams
- Department of Biology and the Vale Living with Lakes Centre, Laurentian University, Sudbury, Ontario, Canada
- Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Joseph B. Yavitt
- Department of Natural Resources, Cornell University, Ithaca, NY, United States of America
| | - Zhi-Guo Yu
- Nanjing University of Information Science and Technology, School of Hydrology and Water Resources, Nanjing, China
| | - Geoff Zahn
- Utah Valley University, Orem, UT, United States of America
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18
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Wang L, Shen Y, Cheng R, Xiao W, Zeng L, Sun P, Chen T, Zhang M. Nitrogen addition promotes early-stage and inhibits late-stage decomposition of fine roots in Pinus massoniana plantation. FRONTIERS IN PLANT SCIENCE 2022; 13:1048153. [PMID: 36452109 PMCID: PMC9701838 DOI: 10.3389/fpls.2022.1048153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 10/24/2022] [Indexed: 06/17/2023]
Abstract
Increasing atmospheric nitrogen (N) deposition has a profound impact on the ecosystem functions and processes. Fine root decomposition is an important pathway for the reentry of nutrients into the soil. However, the effect of N addition on root decomposition and its potential mechanism is not well understood with respect to root branch orders. In this study, we conducted a 30-month decomposition experiment of fine roots under different concentrations of N addition treatments (0, 30, 60, and 90 kg N ha-1 year-1, respectively) in a typical Pinus massoniana plantation in the Three Gorges Reservoir Area of China. In the early stage of decomposition (0-18 months), N addition at all concentrations promoted the decomposition of fine roots, and the average decomposition rates of order 1-2, order 3-4, order 5-6 fine roots were increased by 13.54%, 6.15% and 7.96% respectively. In the late stage of decomposition (18-30 months), high N addition inhibited the decomposition of fine root, and the average decomposition rates of order 1-2, order 3-4, order 5-6 fine roots were decreased by 58.35%, 35.43% and 47.56% respectively. At the same time, N addition promoted the release of lignin, carbon (C), N, and phosphorus (P) in the early-stage, whereas high N addition inhibited the release of lignin, C, N, and the activities of lignin-degrading enzyme (peroxidase and polyphenol oxidase) in the late-stage. The decomposition constant (k) was significantly correlated with the initial chemical quality of the fine roots and lignin-degrading enzyme activities. The higher-order (order 3-4 and order 5-6) fine roots decomposed faster than lower-order (order 1-2) fine roots due to higher initial cellulose, starch, sugar, C concentrations and higher C/N, C/P, lignin/N ratios and lower N, P concentrations. In addition, low N (30 kg N ha-1 year-1) treatments decreased soil organic matter content, whereas high N (90 kg N ha-1 year-1) treatment had the opposite effect. All the N treatments reduced soil pH and total P content, indicating that increased N deposition may led to soil acidification. Our findings indicated that the effect of N addition on decomposition varied with the decomposition stages. The decomposition difference between the lower-order and higher-order fine roots were controlled strongly by the initial chemical quality of the fine roots. This study provides new insights into understanding and predicting possible changes in plant root decomposition and soil properties in the future atmospheric N deposition increase scenarios.
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Affiliation(s)
- Lijun Wang
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
| | - Yafei Shen
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
| | - Ruimei Cheng
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
| | - Wenfa Xiao
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
| | - Lixiong Zeng
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
| | - Pengfei Sun
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
| | - Tian Chen
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
| | - Meng Zhang
- Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China
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19
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Liu J, Ding C, Zhang W, Wei Y, Zhou Y, Zhu W. Litter mixing promoted decomposition rate through increasing diversities of phyllosphere microbial communities. Front Microbiol 2022; 13:1009091. [PMID: 36425041 PMCID: PMC9678933 DOI: 10.3389/fmicb.2022.1009091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 10/19/2022] [Indexed: 11/10/2022] Open
Abstract
Decomposition of forest litter is an essential process for returning nutrients to the soil, which is crucial for preserving soil fertility and fostering the regular biological cycle and nutrient balance of the forest ecosystem. About 70% of the land-based forest litter is made up primarily of leaf litter. However, research on the complex effects and key determinants of leaf litter decomposition is still lacking. In this study, we examined the characteristics of nutrient release and microbial diversity structure during the decomposition of three types of litter in arid and semi-arid regions using 16S rRNA and ITS sequencing technology as well as nutrient content determination. It was revealed that the nutrient content and rate of decomposition of mixed litters were significantly different from those of single species. Following litter mixing, the richness and diversity of the microbial community on leaves significantly increased. It was determined that there was a significant correlation between bacterial diversity and content (Total N, Total P, N/P, and C/P). This study provided a theoretical framework for investigating the decomposition mechanism of mixed litters by revealing the microbial mechanism of mixed decomposition of litters from the microbial community and nutrient levels.
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Affiliation(s)
- Jiaying Liu
- College of Forestry, Shenyang Agriculture University, Shenyang, China
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
- Research Station of Liaohe-River Plain Forest Ecosystem, Chinese Forest Ecosystem Research Network (CFERN), Shenyang Agricultural University, Tieling, China
| | - Changjun Ding
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
- *Correspondence: Changjun Ding,
| | - Weixi Zhang
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
| | - Yawei Wei
- College of Forestry, Shenyang Agriculture University, Shenyang, China
- Research Station of Liaohe-River Plain Forest Ecosystem, Chinese Forest Ecosystem Research Network (CFERN), Shenyang Agricultural University, Tieling, China
| | - Yongbin Zhou
- College of Forestry, Shenyang Agriculture University, Shenyang, China
- Research Station of Liaohe-River Plain Forest Ecosystem, Chinese Forest Ecosystem Research Network (CFERN), Shenyang Agricultural University, Tieling, China
| | - Wenxu Zhu
- College of Forestry, Shenyang Agriculture University, Shenyang, China
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
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20
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Gypsum, crop rotation, and cover crop impacts on soil organic carbon and biological dynamics in rainfed transitional no-till corn-soybean systems. PLoS One 2022; 17:e0275198. [PMID: 36166439 PMCID: PMC9514652 DOI: 10.1371/journal.pone.0275198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 09/12/2022] [Indexed: 11/19/2022] Open
Abstract
Soil organic carbon (SOC), a core soil quality indicator, is influenced by management practices. The objective of our 2012–2016 study was to elucidate the impact of gypsum, crop rotation, and cover crop on SOC and several of its biological indicators under no-till in Alabama (Shorter), Indiana (Farmland), and Ohio (Hoytville and Piketon) in the USA. A randomized complete block design in factorial arrangement with gypsum (at 0, 1.1, and 2.2 Mg/ha annually), rye (Secale cereal L.) vs no cover crop, and rotation (continuous soybean [Glycine max (L) Merr., SS] vs corn [Zea mays, L.]-soybean, both the CS and SC phases) was conducted. Composite soils were collected (0–15 cm and 15–30 cm) in 2016 to analyze microbial biomass C (SMBC), SOC, total N, active C, cold and hot-water extractable C, C and N pool indices (CPI and NPI), and C management index (CMI). Results varied for main effects of gypsum, crop rotation, and cover crop on SOC pools, total N, and SOC lability within and across the sites. Gypsum at 2.2 Mg/ha increased SMBC within sites and by 41% averaged across sites. Likewise, gypsum increased SMBC:SOC, active C, and hot-water C (as indicators of labile SOC) averaged across sites. CS rotation increased SOC, active C, CPI, and CMI compared to SS, but decreased SMBC and SMBC:SOC within and across sites. CPI had a significant relationship with NPI across all sites (R2 = 0.90). Management sensitive SOC pools that responded to the combined gypsum (2.2 Mg/ha), crop rotation (CS), and cover crop (rye) were SMBC, SMBC:SOC, active C, and CMI via SMBC. These variables can provide an early indication of management-induced changes in SOC storage and its lability. Our results show that when SOC accumulates, its lability has decreased, presumably because the SMBC has processed all readily available C into a less labile form.
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21
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Blaško R, Forsmark B, Gundale MJ, Lim H, Lundmark T, Nordin A. The carbon sequestration response of aboveground biomass and soils to nutrient enrichment in boreal forests depends on baseline site productivity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:156327. [PMID: 35640755 DOI: 10.1016/j.scitotenv.2022.156327] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/23/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
Nutrient enrichment can alleviate productivity limitations and thus substantially increase carbon (C) uptake in northern coniferous forests. Yet, factors controlling stand-to-stand variation of forest ecosystem responses to nutrient enrichment remain unclear. We used five long-term (13 years) nutrient-enrichment experiments across Sweden, where nitrogen (N), phosphorus, and potassium were applied annually to young Norway spruce forests that varied in their baseline ecosystem properties. We measured tree biomass and soil C and N stocks, litterfall C inputs, soil CO2 efflux, and shifts in composition and biomass of soil microbial communities to understand the links between above and belowground responses to nutrient enrichment. We found that the strongest responses in tree biomass occurred when baseline site productivity was lowest. High increases in tree biomass C stocks were generally balanced by weaker responses in organic soil C stocks. The average ecosystem C-N response rate was 35 kg C kg-1 N added, with a nearly five-fold greater response rate in tree biomass than in soil. The positive nutrient enrichment effects on ecosystem C sinks were driven by a 95% increase in tree biomass C stocks, 150% increase in litter production, 67% increase in organic layer C stocks, and a 46% reduction in soil CO2 efflux accompanied by compositional changes in soil microbial communities. Our results show that ecosystem C uptake in spruce forests in northern Europe can be substantially enhanced by nutrient enrichment; however, the strength of the responses and whether the enhancement occurs mainly in tree biomass or soils are dependent on baseline forest productivity.
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Affiliation(s)
- Róbert Blaško
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden; Slovak Environment Agency, Tajovského 28, 975 90 Banská Bystrica, Slovakia.
| | - Benjamin Forsmark
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden; Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, SE-230 53 Alnarp, Sweden
| | - Michael J Gundale
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
| | - Hyungwoo Lim
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden; Institute of Ecology and Earth Sciences, University of Tartu, 50409 Tartu, Estonia
| | - Tomas Lundmark
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
| | - Annika Nordin
- Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Umeå University/Swedish University of Agricultural Sciences, SE-90736/SE-901 83 Umeå, Sweden
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22
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Hao X, Ouyang W, Zhang K, Wan X, Cui X, Zhu W. Enhanced release, export, and transport of diffuse nutrients from litter in forested watersheds with climate warming. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 837:155897. [PMID: 35569656 DOI: 10.1016/j.scitotenv.2022.155897] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/08/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
Variations in litter decomposition and nutrient migration are constraints to accurately estimate watershed diffuse forest pollution under the combined effects of topographic heterogeneity and climate change. In this study, remote sensing data, decomposition and leaching experiments, and the Soil and Water Assessment Tool (SWAT) were used to quantify the release, export, and transport characteristics of diffuse nutrients from forest litter under two climate scenarios (the current climate condition [S1] and the future warming and drying climate condition [S2]), and the impacts on aquatic environment were identified. The annual litter decomposition was 27.80 × 106 t in S2, which was 1.39 times that of S1. Additionally, the annual litter nutrient release in S2 (C, N, and P was 8.65 × 106, 3.31 × 105, and 1.57 × 104 t, respectively) also increased by 31.16%-45.62% compared with that of S1. The spatial patterns of nutrient export showed that the annual exports of C, N, and P in S1 were 109.77, 46.85, and 0.43 kg/ha, respectively. The annual nutrient export in S2 increased by 1.44 times, and S2 also had higher values of nutrient transport. In addition, variation trends of temperature and precipitation increased significantly with increasing altitude, which promoted differences in nutrient transport between S1 and S2 in the high-altitude areas. The response analysis of the diffuse nutrient in surface water also indicated that forest nutrient discharge load were critical factors affecting the aquatic environmental quality. This study indicated that climate warming accelerated litter decomposition and made litter a potential source of diffuse forest pollution, and watershed discharge load varied intensively with the terrestrial conditions. The combination of experiments and modeling can improve the accuracy of diffuse forest pollution simulation and provide valuable information for formulating watershed climate change adaptation strategies.
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Affiliation(s)
- Xin Hao
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Wei Ouyang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Advanced interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China.
| | - Kehao Zhang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Xinyue Wan
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Xintong Cui
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Weihong Zhu
- School of Geographic and Ocean Sciences, Key laboratory of Wetland Ecological Functions and Ecological Security, Yanbian University, Yanji, Jilin 133000, China
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23
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Meyer UN, Tischer A, Freitag M, Klaus VH, Kleinebecker T, Oelmann Y, Kandeler E, Hölzel N, Hamer U. Enzyme kinetics inform about mechanistic changes in tea litter decomposition across gradients in land-use intensity in Central German grasslands. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 836:155748. [PMID: 35526633 DOI: 10.1016/j.scitotenv.2022.155748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 05/02/2022] [Accepted: 05/02/2022] [Indexed: 06/14/2023]
Abstract
Grassland ecosystems provide important ecosystem services such as nutrient cycling and primary production that are affected by land-use intensity. To assess the effects of land-use intensity, operational and sensitive ecological indicators that integrate effects of grassland management on ecosystem processes such as organic matter turnover are needed. Here, we investigated the suitability of measuring the mass loss of standardized tea litter together with extracellular enzyme kinetics as a proxy of litter decomposition in the topsoil of grasslands along a well-defined land-use intensity gradient (fertilization, mowing, grazing) in Central Germany. Tea bags containing either green tea (high-quality litter) or rooibos tea (low-quality litter) were buried in 5 cm soil depth. Litter mass loss was measured after three (early-stage decomposition) and 12 months (mid-stage decomposition). Based on the fluorescence measurement of the reaction product 4-methylumbelliferone, Michaelis-Menten enzyme kinetics (Vmax: potential maximum rate of activity; Km: substrate affinity) of five hydrolases involved in the carbon (C)-, nitrogen (N)- and phosphorus (P)-cycle (β-glucosidase (BG), cellobiohydrolase (CBH), cellotriohydrolase (CTH), 1,4-β-N-acetylglucosaminidase (NAG), and phosphatase (PH)) were determined in tea litter bags and in the surrounding soil. The land-use intensity index (LUI), summarizing fertilization, mowing, grazing, and in particular the frequency of mowing were identified as important drivers of early-stage tea litter decomposition. Mid-stage decomposition was influenced by grazing intensity. The higher the potential activity of all measured C-, N- and P-targeting enzymes, the higher was the decomposition of both tea litters in the early-phase. During mid-stage decomposition, individual enzyme parameters (Vmax of CTH and PH, Km of CBH) became more important. The tea bag method proved to be a suitable indicator which allows an easy and cost-effective assessment of land-use intensity effects on decay processes in manged grasslands. In combination with enzyme kinetics it is an appealing approach to identify mechanisms driving litter break down.
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Affiliation(s)
- Ulf-Niklas Meyer
- Institute of Landscape Ecology, University of Münster, Heisenbergstraße 2, 48149 Münster, Germany
| | - Alexander Tischer
- Department of Soil Science, Friedrich-Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany
| | - Martin Freitag
- Institute of Landscape Ecology, University of Münster, Heisenbergstraße 2, 48149 Münster, Germany
| | - Valentin H Klaus
- Insitute of Agricultural Sciences, Department of Environmental Systems Science, ETH Zürich, Universitätstrasse 2, 8092 Zürich, Switzerland
| | - Till Kleinebecker
- Institute for Landscape Ecology and Resource Management, Giessen University, Heinrich-Buff-Ring 26-32, 35392 Gießen, Germany
| | - Yvonne Oelmann
- Geoecology, Department of Geosciences, University of Tübingen, Rümelinstr. 19-23, 72070 Tübingen, Germany
| | - Ellen Kandeler
- Institute of Soil Science and Land Evaluation, Department of Soil Biology, University of Hohenheim, Emil Wolff Str. 27, 70599 Stuttgart, Germany
| | - Norbert Hölzel
- Institute of Landscape Ecology, University of Münster, Heisenbergstraße 2, 48149 Münster, Germany
| | - Ute Hamer
- Institute of Landscape Ecology, University of Münster, Heisenbergstraße 2, 48149 Münster, Germany.
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24
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Asada K, Kanda T, Yamashita N, Asano M, Eguchi S. Interpreting stoichiometric homeostasis and flexibility of soil microbial biomass carbon, nitrogen, and phosphorus. Ecol Modell 2022. [DOI: 10.1016/j.ecolmodel.2022.110018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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25
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Shay PE, Winder RS, Constabel CP, Trofymow JA(T. Fungal Community Composition as Affected by Litter Chemistry and Weather during Four Years of Litter Decomposition in Rainshadow Coastal Douglas-Fir Forests. J Fungi (Basel) 2022; 8:jof8070735. [PMID: 35887490 PMCID: PMC9323820 DOI: 10.3390/jof8070735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 07/07/2022] [Accepted: 07/13/2022] [Indexed: 12/04/2022] Open
Abstract
Climate and litter chemistry are major factors influencing litter decay, a process mediated by microbes, such as fungi, nitrogen-fixing bacteria and ammonia-oxidizing bacteria. Increasing atmospheric CO2 concentrations can decrease nitrogen (N) and increase condensed tannin (CT) content in foliar litter, reducing litter quality and slowing decomposition. We hypothesized that reduced litter quality inhibits microbes and is the mechanism causing decomposition to slow. Litterbags of Douglas-fir needles and poplar leaves with a range of N (0.61–1.57%) and CT (2.1–29.1%) treatment and natural acid unhydrolyzable residue (35.3–41.5%) concentrations were placed along climatic gradients in mature Douglas-fir stands of coastal British Columbia rainshadow forests. The structure (diversity, richness and evenness) and composition of microbial communities were analyzed using DGGE profiles of 18S, NifH-universal and AmoA PCR amplicons in foliar litter after 7, 12, 24 and 43 months of decay. High CT and low N concentrations in leaf litter were associated with changes in microbial community composition, especially fungi. Contrary to our hypothesis, high CT and low N treatments did not inhibit microbial colonization or diversity. The joint effects of air temperature and soil moisture on microbial community composition at our sites were more important than the effects of initial litter chemistry.
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Affiliation(s)
- Philip-Edouard Shay
- Centre for Forest Biology, Department of Biology, University of Victoria, Victoria, BC V8W 3N5, Canada; (P.-E.S.); (C.P.C.)
- Pacific Forestry Centre, Canadian Forest Service, 506 West Burnside Road, Victoria, BC V8Z 1M5, Canada;
| | - Richard S. Winder
- Pacific Forestry Centre, Canadian Forest Service, 506 West Burnside Road, Victoria, BC V8Z 1M5, Canada;
| | - C. Peter Constabel
- Centre for Forest Biology, Department of Biology, University of Victoria, Victoria, BC V8W 3N5, Canada; (P.-E.S.); (C.P.C.)
| | - J. A. (Tony) Trofymow
- Centre for Forest Biology, Department of Biology, University of Victoria, Victoria, BC V8W 3N5, Canada; (P.-E.S.); (C.P.C.)
- Pacific Forestry Centre, Canadian Forest Service, 506 West Burnside Road, Victoria, BC V8Z 1M5, Canada;
- Correspondence:
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26
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Zhou Y, Shen X, Chen Y, Wang L, Zhang J, Xu Z, Guo L, Tan B, Wang L, You C, Liu Y. Both specific plant functional type loss and vegetation change influence litter metallic element release in an alpine treeline ecotone. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:41544-41556. [PMID: 35094284 DOI: 10.1007/s11356-022-18778-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Climate warming changes the plant community composition and biodiversity. Dominate species or plant functional types (PFTs) loss may influence alpine ecosystem processes, but much uncertainty remains. This study tested whether loss of specific PFTs and vegetation variation would impact the metallic element release of mixed litter in an alpine treeline ecotone. Six representative PFTs in the alpine ecosystem on the eastern Tibetan Plateau were selected. Litterbags were used to determine the release of potassium, calcium, magnesium, sodium, manganese, zinc, copper, iron, and aluminum from litter loss of specific PFTs after 669 days of decomposition in coniferous forest (CF) and alpine shrubland (AS). The results showed that potassium, sodium, magnesium, and copper were net released, while aluminum, iron, and manganese were accumulated after 669 days. Functional type mixtures promoted the release of potassium, sodium, aluminum, and zinc (synergistic effect), while inhibiting the release of calcium, magnesium, and iron (antagonistic effect). Further, loss of specific plant functional type significantly affected the aluminum and iron release rates and the relatively mixed effects of the potassium, aluminum, and iron release rates. The synergistic effects on potassium, sodium, and aluminum in AS were greater than those in CF, while the antagonistic effect of manganese release in AS was lower than that in CF. Therefore, increased altitude may further promote the synergistic effect of potassium, sodium, and aluminum release and alleviate the antagonistic effect of manganese in mixed litter. Finally, the initial stoichiometric ratios regulate the mixed effects of elemental release rates, with the nitrogen-related stoichiometric ratios playing the most important role. The regulation of elements release by stoichiometric ratios requires more in-depth and systematic studies, which will help us to understand the influence mechanism of decomposition more comprehensively.
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Affiliation(s)
- Yu Zhou
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Xian Shen
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Yamei Chen
- Key Laboratory of Southwest China Wildlife Resources Conservation, China West Normal University, Ministry of Education, Nanchong, 637009, Sichuan, China
| | - Lifeng Wang
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Jian Zhang
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Zhenfeng Xu
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Li Guo
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, 611130, China
| | - Bo Tan
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Lixia Wang
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Chengming You
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China
| | - Yang Liu
- Long-Term Research Station of Alpine Ecosystems, Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu, 611130, China.
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Carbon and Nutrient Stoichiometric Relationships in the Soil–Plant Systems of Disturbed Boreal Forest Peatlands within Athabasca Oil Sands Region, Canada. FORESTS 2022. [DOI: 10.3390/f13060865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Peatlands store carbon (C), nitrogen (N), and phosphorus (P), and the stoichiometric relationship among them may be modified by ecosystem disturbances, with major implications for boreal peatland ecosystem functions. To understand the potential impact of landscape fragmentation on peatland nutrient stoichiometry, we characterize the stoichiometric ratios of C, N and P in the soil–plant systems of disturbed boreal forest peatlands and also assessed relationships among site conditions, nutrient availability, stoichiometric ratios (C:N:P) and C storage in four sites that represent the forms of disturbed peatlands in the Athabasca oil sands region. Our results showed that nutrient stoichiometric balance differed across and within these peatlands, among plants, peat, and groundwater. Ratios of C:N and C:P in peat is a function of nutrient and moisture conditions, increasing from nutrient-rich (C:N = 28; C:P = 86) to nutrient-poor fens (C:N = 82; C:P = 1061), and were lower in moist hollows relative to drier hummock microforms. In groundwater, the drier nutrient-rich fen had higher N:P ratios relative to the nutrient-poor fen, reflecting interactions between dominant hydrologic conditions and stoichiometric relationships. The N:P ratio of plants was more similar to those of peat than groundwater pools, especially in the most recently disturbed nutrient-poor fen, where plant C:N:P ratios were greater compared to older disturbed sites in the region. These findings suggest that disturbances that modify moisture and nutrient regimes could potentially upset the C:N:P stoichiometric balance of boreal forest peatlands. It also provides valuable insights and essential baseline data to inform our understanding of how peatland C:N:P stoichiometry would respond to disturbance and restoration interventions in a boreal forest region at the tipping point of environmental change.
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Contribution of Incorporating the Phosphorus Cycle into TRIPLEX-CNP to Improve the Quantification of Land Carbon Cycle. LAND 2022. [DOI: 10.3390/land11060778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Phosphorus (P) is a key and a limiting nutrient in ecosystems and plays an important role in many physiological and biochemical processes, affecting both terrestrial ecosystem productivity and soil carbon storage. However, only a few global land surface models have incorporated P cycle and used to investigate the interactions of C-N-P and its limitation on terrestrial ecosystems. The overall objective of this study was to integrate the P cycle and its interaction with carbon (C) and nitrogen (N) into new processes model of TRIPLEX-CNP. In this study, key processes of the P cycle, including P pool sizes and fluxes in plant, litter, and soil were integrated into a new model framework, TRIPLEX-CNP. We also added dynamic P:C ratios for different ecosystems. Based on sensitivity analysis results, we identified the phosphorus resorption coefficient of leaf (rpleaf) as the most influential parameter to gross primary productivity (GPP) and biomass, and determined optimal coefficients for different plant functional types (PFTs). TRIPLEX-CNP was calibrated with 49 sites and validated against 116 sites across eight biomes globally. The results suggested that TRIPLEX-CNP performed well on simulating the global GPP and soil organic carbon (SOC) with respective R2 values of 0.85 and 0.78 (both p < 0.01) between simulated and observed values. The R2 of simulation and observation of total biomass are 0.67 (p < 0.01) by TRIPLEX-CNP. The overall model performance had been improved in global GPP, total biomass and SOC after adding the P cycle comparing with the earlier version. Our work represents the promising step toward new coupled ecosystem process models for improving the quantifications of land carbon cycle and reducing uncertainty.
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Aldorfová A, Dostálek T, Münzbergová Z. Effects of soil conditioning, root and shoot litter addition interact to determine the intensity of plant–soil feedback. OIKOS 2022. [DOI: 10.1111/oik.09025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Anna Aldorfová
- Inst. of Botany of the Czech Academy of Sciences Průhonice Czech Republic
- Dept of Botany, Faculty of Science, Charles Univ. in Prague Praha 2 Czech Republic
| | - Tomáš Dostálek
- Inst. of Botany of the Czech Academy of Sciences Průhonice Czech Republic
- Dept of Botany, Faculty of Science, Charles Univ. in Prague Praha 2 Czech Republic
| | - Zuzana Münzbergová
- Inst. of Botany of the Czech Academy of Sciences Průhonice Czech Republic
- Dept of Botany, Faculty of Science, Charles Univ. in Prague Praha 2 Czech Republic
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Temporally Selective Modification of the Tomato Rhizosphere and Root Microbiome by Volcanic Ash Fertilizer Containing Micronutrients. Appl Environ Microbiol 2022; 88:e0004922. [PMID: 35311513 PMCID: PMC9004379 DOI: 10.1128/aem.00049-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Food crops are grown with fertilizers containing nitrogen, phosphorus, and potassium (macronutrients) along with magnesium, calcium, boron, and zinc (micronutrients) at different ratios during their cultivation. Soil and plant-associated microbes have been implicated to promote plant growth, stress tolerance, and productivity. However, the high degree of variability across agricultural environments makes it difficult to assess the possible influences of nutrient fertilizers on these microbial communities. Uncovering the underlying mechanisms could lead us to achieve consistently improved food quality and productivity with minimal environmental impacts. For this purpose, we tested a commercially available fertilizer (surface-mined volcanic ash deposit Azomite) applied as a supplement to the normal fertilizer program of greenhouse-grown tomato plants. Because this treatment showed a significant increase in fruit production at measured intervals, we examined its impact on the composition of below-ground microbial communities, focusing on members identified as “core taxa” that were enriched in the rhizosphere and root endosphere compared to bulk soil and appeared above their predicted neutral distribution levels in control and treated samples. This analysis revealed that Azomite had little effect on microbial composition overall, but it had a significant, temporally selective influence on the core taxa. Changes in the composition of the core taxa were correlated with computationally inferred changes in functional pathway enrichment associated with carbohydrate metabolism, suggesting a shift in available microbial nutrients within the roots. This finding exemplifies how the nutrient environment can specifically alter the functional capacity of root-associated bacterial taxa, with the potential to improve crop productivity. IMPORTANCE Various types of soil fertilizers are used routinely to increase crop yields globally. The effects of these treatments are assessed mainly by the benefits they provide in increased crop productivity. There exists a gap in our understanding of how soil fertilizers act on the plant-associated microbial communities. The underlying mechanisms of nutrient uptake are widely complex and, thus, difficult to evaluate fully but have critical influences on both soil and plant health. Here, we presented a systematic approach to analyzing the effects of fertilizer on core microbial communities in soil and plants, leading to predictable outcomes that can be empirically tested and used to develop simple and affordable field tests. The methods described here can be used for any fertilizer and crop system. Continued effort in advancing our understanding of how fertilizers affect plant and microbe relations is needed to advance scientific understanding and help growers make better-informed decisions.
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31
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Mohanta MR, Rout Y, Pradhan B, Bhoi D, Chand PK, Sahu SC. Anthropogenic interventions regulate forest structure and carbon stock in transitional dry forests of Similipal Biosphere Reserve, India. ECOSCIENCE 2022. [DOI: 10.1080/11956860.2022.2030130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Manas R. Mohanta
- Department of Botany, Maharaja Sriram Chandra Bhanjadeo University (Erstwhile: North Orissa University), Baripada- India
| | - Yasaswinee Rout
- Department of Botany, Maharaja Sriram Chandra Bhanjadeo University (Erstwhile: North Orissa University), Baripada- India
| | - Bikram Pradhan
- Department of Botany, Maharaja Sriram Chandra Bhanjadeo University (Erstwhile: North Orissa University), Baripada- India
| | - Dhiren Bhoi
- Department of Botany, Maharaja Sriram Chandra Bhanjadeo University (Erstwhile: North Orissa University), Baripada- India
| | - Pradeep K. Chand
- Department of Botany, Maharaja Sriram Chandra Bhanjadeo University (Erstwhile: North Orissa University), Baripada- India
| | - Sudam C. Sahu
- Department of Botany, Maharaja Sriram Chandra Bhanjadeo University (Erstwhile: North Orissa University), Baripada- India
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Zhang Y, Jin Y, Xu J, He H, Tao Y, Yang Z, Bai Y. Effects of exogenous N and endogenous nutrients on alpine tundra litter decomposition in an area of high nitrogen deposition. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 805:150388. [PMID: 34818765 DOI: 10.1016/j.scitotenv.2021.150388] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/12/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
The effects of N deposition on the C and N cycles via altered litter decomposition rates are an important aspect of global environmental change. The Changbai Mountain region experienced a high N deposition (2.7 g·m-2·year-1 in 2015) and corresponding expansion of Deyeuxia purpurea into the alpine tundra, resulting in changes in endogenous nutrients. However, the relative contributions of the N deposition and endogenous litter nutrients to litter decompositions remain unclear. Therefore, a 5-year N addition and 2-year litter decomposition experiments were conducted. Exogenous N reduced the remaining litter mass of Rhododendron aureum at the early stage (30-240 d) by promoting soluble sugar release, and increased it at the late stage (360-720 d) by suppressing lignin release and decreasing soil microbial community and enzyme activity. A higher proportion of D. purpurea litter (representing higher N, lower lignin, and C:N ratio) decreased remaining litter mass and increased net N release. Exogenous N decreased decomposition rate from 0.32 to 0.21 and net N release from 34% to 24%, whereas litter compositions increased decomposition rates from 0.32 to 0.69 and net litter N release from 34% to 69%. Endogenous litter nutrients directly explained 62% and 40% of the litter decomposition and net N release variables, respectively, whereas exogenous N indirectly explained 12% and 9%, respectively. Thus, we infer that the reductions in C and N storage following D. purpurea expansion may offset the increases of C and N storage under N deposition and the expansion of D. purpurea has a potential long-term negative impact on the ability of tundra plants to sequester C and N in the alpine tundra of the Changbai Mountains. These findings highlight how shifting plant expansion, through changes endogenous nutrients, can influence tundra litter decomposition and C and N storage responses to N deposition.
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Affiliation(s)
- Yingjie Zhang
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
| | - Yinghua Jin
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
| | - Jiawei Xu
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
| | - Hongshi He
- School of Natural Resources, University of Missouri, Columbia, MO 65211, USA.
| | - Yan Tao
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
| | - Zhipeng Yang
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
| | - Yunyu Bai
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China.
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Zhou Y, Wang L, Chen Y, Zhang J, Xu Z, Guo L, Wang L, You C, Tan B, Zhang L, Chen L, Xiao J, Zhu P, Liu Y. Temporal dynamics of mixed litter humification in an alpine treeline ecotone. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 803:150122. [PMID: 34525692 DOI: 10.1016/j.scitotenv.2021.150122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 08/28/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
Loss of plant diversity affects mountain ecosystem properties and processes, yet few studies have focused on the impact of plant function type deficiency on mixed litter humification. To fill this knowledge gap, we conducted a 1279-day litterbag decomposition experiment with six plant functional types of foliar litter to determine the temporal dynamic characteristics of mixed litter humification in a coniferous forest (CF) and an alpine shrubland (AS). The results indicated that the humus concentrations, the net accumulations and their relative mixed effects (RME) of most types were higher in CF than those in AS at 146 days, and humus net accumulations fell to approximately -80% of the initial level within 1279 days. The RME of the total humus and humic acid concentrations exhibited a general change from synergistic to antagonistic effects over time, but the mixing of single plant functional type impeded the formation of fulvic acid due to consistently exhibited antagonistic effects. Ultimately, correlation analysis indicated that environmental factors (temperature, snow depth and freeze-thaw cycles) significantly hindered litter humification in the early stage, while some initial quality factors drove this process at a longer scale. Among these aspects, the concentrations of zinc, copper and iron, as well as acid-unhydrolyzable residue (AUR):nitrogen and AUR:phosphorous, stimulated humus accumulation, while water-soluble extractables, potassium, magnesium and aluminium hampered it. Deficiencies in a single plant functional type and vegetation type variations affected litter humification at the alpine treeline, which will further affect soil carbon sequestration, which is of great significance for understanding the material circulation of alpine ecosystems.
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Affiliation(s)
- Yu Zhou
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Lifeng Wang
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Yamei Chen
- Key Laboratory of Southwest China Wildlife Resources Conservation, China West Normal University, Ministry of Education, Nanchong, Sichuan 637009, China
| | - Jian Zhang
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Zhenfeng Xu
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Li Guo
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China
| | - Lixia Wang
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Chengming You
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Bo Tan
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Li Zhang
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - LiangHua Chen
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - JiuJin Xiao
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Peng Zhu
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China
| | - Yang Liu
- Long-term Research Station of Alpine Ecosystems, Key laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forests, Sichuan Agricultural University, Chengdu 611130, China.
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Zhang J, Sayer EJ, Zhou J, Li Y, Li Y, Li Z, Wang F. Long-term fertilization modifies the mineralization of soil organic matter in response to added substrate. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 798:149341. [PMID: 34375236 DOI: 10.1016/j.scitotenv.2021.149341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 07/14/2021] [Accepted: 07/25/2021] [Indexed: 06/13/2023]
Abstract
The turnover of SOC in soils is strongly influenced by the availability of substrate and nutrients, especially nitrogen (N) and phosphorus (P). Here, we assessed how long-term fertilization modified SOM mineralization in response to added substrate in a tropical forest. We carried out a 90-day incubation study in which we added two structurally similar compounds which differed in microbial metabolic availability: corn cellulose or corn starch to soils collected from a long-term (11 years) factorial N and P fertilization experiment site in a tropical forest in south China. We measured total soil mineralization rate (CO2 efflux) to characterize SOM mineralization and using 13C isotope signatures to determine the source of the CO2 (original soil C or added substrate) and assessed changes in extracellular enzyme activities: acid phosphomonoesterase (AP), β-1,4-glucosidase (BG), β-1,4- N-acetaminophen glucosidase (NAG), phenol oxidase (PHO) and peroxidase (PER), and microbial biomarkers to determine whether nutrient stoichiometry and decomposer communities explain differences in SOM mineralization rates. Total C mineralization increased substantially with substrate addition, particularly cellulose (5.38, 7.13, 5.58 and 5.37 times for N, P, NP fertilization and CK, respectively) compared to no substrate addition, and original soil C mineralization was further enhanced in long-term N (3.40% and 5.18% for cellulose and starch addition, respectively) or NP (35.11% for cellulose addition) fertilized soils compared to control treatment. Enzyme activities were stimulated by the addition of both substrates but suppressed by P-fertilization. Addition of both substrates increased microbial investment in P-acquisition, but only starch addition promoted C investment in N-acquisition. Finally, fungal abundance increased with substrate addition to a greater extent than bacterial abundance, particularly in cellulose-amended soils, and the effect was amplified by long-term fertilization. Our findings indicate that SOM mineralization might be enhanced in N and P enrichment ecosystems, since the litter input can liberate microbes from C limitation and stimulate SOM mineralization if N and P are sufficient. Our study further demonstrates that structurally similar substrates can have distinct effects on SOM mineralization and the extent of SOM mineralization is strongly dependent on elemental stoichiometry, as well as the resource requirements of microbial decomposers.
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Affiliation(s)
- Jingfan Zhang
- Xiaoliang Research Station of Tropical Coastal Ecosystems, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, and the CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China; University of Chinese Academy of Sciences, Beijing 100049, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, PR China
| | - Emma J Sayer
- Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK; Smithsonian Tropical Research Institute, P.O. Box 0843-03092, Balboa, Ancon, Panama, Panama
| | - Jinge Zhou
- Xiaoliang Research Station of Tropical Coastal Ecosystems, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, and the CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China; University of Chinese Academy of Sciences, Beijing 100049, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, PR China
| | - Yingwen Li
- Xiaoliang Research Station of Tropical Coastal Ecosystems, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, and the CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China
| | - Yongxing Li
- Xiaoliang Research Station of Tropical Coastal Ecosystems, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, and the CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China
| | - Zhian Li
- Xiaoliang Research Station of Tropical Coastal Ecosystems, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, and the CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, PR China
| | - Faming Wang
- Xiaoliang Research Station of Tropical Coastal Ecosystems, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, and the CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, PR China.
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Yao L, Adame MF, Chen C. Resource stoichiometry, vegetation type and enzymatic activity control wetlands soil organic carbon in the Herbert River catchment, North-east Queensland. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 296:113183. [PMID: 34229139 DOI: 10.1016/j.jenvman.2021.113183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 05/28/2021] [Accepted: 06/27/2021] [Indexed: 06/13/2023]
Abstract
Wetlands are highly productive ecosystem with great potential to store carbon (C) and retain nitrogen (N) and phosphorus (P) in their soil. Changes in vegetation type and land use can affect organic matter inputs and soil properties. This work aimed to examine how these changes affected elemental stoichiometry and C-, N-, and P- associated enzyme activities and wetland soil organic C stock. We quantified organic C concentrations, and stoichiometric ratios of C, N, and P in total and microbial biomass pools, along with the activities and ratios of C-, N-, and P-associated enzymes for soils of natural coastal wetlands with different vegetation types, namely Melaleuca wetland (Melaleuca spp), mangrove forests (Bruguiera spp), and saline marsh (Eleocharis spp). We also compared these natural wetlands to an adjacent sugarcane plantation to understand the effects of vegetation types. Hypothesis-oriented path analysis was used to explore links between these variables and soil organic C stocks. Tidal forested soils (0-30 cm) had the highest organic C, N, and P contents and potential activities of C-, N-, P- acquiring enzymes, compared with other vegetation types. Mangroves soils had the highest total soil C:N and microbial biomass C:P ratios. Microbial biomass C:P ratios were significantly and positively related to total C:P, while microbial biomass N:P ratios were positively associated with total soil C:P and N:P ratios. Path analysis suggested that soil organic C stock was largely explained by total C:P ratio, microbial biomass N:P ratios, total P content, and the ratio of C- and P-associated enzymes. Different types of wetlands have different soil properties and enzymatic activities, implying their different capacity to store and process C and N. The resource quality and stoichiometry direct influence the organic C stock.
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Affiliation(s)
- Lu Yao
- Australian Rivers Institute and School of Environment and Science, Griffith University, Nathan, QLD, 4111, Australia.
| | - Maria Fernanda Adame
- Australian Rivers Institute and School of Environment and Science, Griffith University, Nathan, QLD, 4111, Australia
| | - Chengrong Chen
- Australian Rivers Institute and School of Environment and Science, Griffith University, Nathan, QLD, 4111, Australia.
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Pold G, Baillargeon N, Lepe A, Rastetter EB, Sistla SA. Warming effects on arctic tundra biogeochemistry are limited but habitat‐dependent: a meta‐analysis. Ecosphere 2021. [DOI: 10.1002/ecs2.3777] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Grace Pold
- Natural Resources Management & Environmental Sciences College of Agriculture, Food & Environmental Sciences California Polytechnic State University San Luis Obispo California USA
| | - Natalie Baillargeon
- Smith College Northampton Massachusetts USA
- Woodwell Climate Research Center Woods Hole Massachusetts USA
| | - Adan Lepe
- Amherst College Amherst Massachusetts USA
| | - Edward B. Rastetter
- Marine Biological Laboratories The Ecosystems Center Woods Hole Massachusetts USA
| | - Seeta A. Sistla
- Natural Resources Management & Environmental Sciences College of Agriculture, Food & Environmental Sciences California Polytechnic State University San Luis Obispo California USA
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Manzoni S, Ding Y, Warren C, Banfield CC, Dippold MA, Mason-Jones K. Intracellular Storage Reduces Stoichiometric Imbalances in Soil Microbial Biomass – A Theoretical Exploration. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.714134] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Microbial intracellular storage is key to defining microbial resource use strategies and could contribute to carbon (C) and nutrient cycling. However, little attention has been devoted to the role of intracellular storage in soil processes, in particular from a theoretical perspective. Here we fill this gap by integrating intracellular storage dynamics into a microbially explicit soil C and nutrient cycling model. Two ecologically relevant modes of storage are considered: reserve storage, in which elements are routed to a storage compartment in proportion to their uptake rate, and surplus storage, in which elements in excess of microbial stoichiometric requirements are stored and limiting elements are remobilized from storage to fuel growth and microbial maintenance. Our aim is to explore with this model how these different storage modes affect the retention of C and nutrients in active microbial biomass under idealized conditions mimicking a substrate pulse experiment. As a case study, we describe C and phosphorus (P) dynamics using literature data to estimate model parameters. Both storage modes enhance the retention of elements in microbial biomass, but the surplus storage mode is more effective to selectively store or remobilize C and nutrients according to microbial needs. Enhancement of microbial growth by both storage modes is largest when the substrate C:nutrient ratio is high (causing nutrient limitation after substrate addition) and the amount of added substrate is large. Moreover, storage increases biomass nutrient retention and growth more effectively when resources are supplied in a few large pulses compared to several smaller pulses (mimicking a nearly constant supply), which suggests storage to be particularly relevant in highly dynamic soil microhabitats. Overall, our results indicate that storage dynamics are most important under conditions of strong stoichiometric imbalance and may be of high ecological relevance in soil environments experiencing large variations in C and nutrient supply.
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38
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Xiao X, Chen J, Liao X, Liu J, Wang D, Li J, Yan Q. Ecological stoichiometry of
Cinnamomum migao
leaf litter and soil nutrients under nitrogen deposition in a karst region. Ecosphere 2021. [DOI: 10.1002/ecs2.3738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Xuefeng Xiao
- Forestry College Research Center of Forest Ecology Guizhou University Guiyang 550025 China
| | - Jingzhong Chen
- Forestry College Research Center of Forest Ecology Guizhou University Guiyang 550025 China
| | - Xiaofeng Liao
- Institute of Mountain Resources Guizhou Academy of Science Guiyang 550001 China
| | - Jiming Liu
- Forestry College Research Center of Forest Ecology Guizhou University Guiyang 550025 China
| | - Deng Wang
- Forestry College Research Center of Forest Ecology Guizhou University Guiyang 550025 China
| | - Jia Li
- Forestry College Research Center of Forest Ecology Guizhou University Guiyang 550025 China
| | - Qiuxiao Yan
- Forestry College Research Center of Forest Ecology Guizhou University Guiyang 550025 China
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39
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Fu YM, Zhang XY, Qi DD, Feng FJ. Changes in leaf litter decomposition of primary Korean pine forests after degradation succession into secondary broad-leaved forests. Ecol Evol 2021; 11:12335-12348. [PMID: 34594503 PMCID: PMC8462155 DOI: 10.1002/ece3.7903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 06/12/2021] [Accepted: 06/25/2021] [Indexed: 11/22/2022] Open
Abstract
Forest degradation succession often leads to changes in forest ecosystem functioning. Exactly how the decomposition of leaf litter is affected in a disturbed forest remains unknown. Therefore, in our study, we selected a primary Korean pine forest (PK) and a secondary broad-leaved forest (SF) affected by clear-cutting degradation, both in Northeast China. The aim was to explore the response to changes in the leaf litter decomposition converting PK to SF. The mixed litters of PK and SF were decomposed in situ (1 year). The proportion of remaining litter mass, main chemistry, and soil biotic and abiotic factors were assessed during decomposition, and then, we made an in-depth analysis of the changes in the leaf litter decomposition. According to our results, leaf litter decomposition rate was significantly higher in the PK than that in the SF. Overall, the remaining percent mass of leaf litter's main chemical quality in SF was higher than in PK, indicating that leaf litter chemical turnover in PK was relatively faster. PK had a significantly higher amount of total phospholipid fatty acids (PLFAs) than SF during decomposition. Based on multivariate regression trees, the forest type influenced the soil habitat factors related to leaf litter decomposition more than decomposition time. Structural equation modeling revealed that litter N was strongly and positively affecting litter decomposition, and the changes in actinomycetes PLFA biomass played a more important role among all the functional groups. Selected soil abiotic factors were indirectly driving litter decomposition through coupling with actinomycetes. This study provides evidence for the complex interactions between leaf litter substrate and soil physical-chemical properties in affecting litter decomposition via soil microorganisms.
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Affiliation(s)
- Yan-Mei Fu
- School of Life Sciences Northeast Forestry University Harbin China
- Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy Sciences Changchun China
| | - Xiu-Yue Zhang
- School of Life Sciences Northeast Forestry University Harbin China
| | - Dan-Dan Qi
- School of Life Sciences Northeast Forestry University Harbin China
| | - Fu-Juan Feng
- School of Life Sciences Northeast Forestry University Harbin China
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40
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The Exudation of Surplus Products Links Plant Functional Traits and Plant-Microbial Stoichiometry. LAND 2021. [DOI: 10.3390/land10080840] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The rhizosphere is a hot spot of soil microbial activity and is largely fed by root exudation. The carbon (C) exudation flux, coupled with plant growth, is considered a strategy of plants to facilitate nutrient uptake. C exudation is accompanied by a release of nutrients. Nitrogen (N) and phosphorus (P) co-limit the productivity of the plant-microbial system. Therefore, the C:N:P stoichiometry of exudates should be linked to plant nutrient economies, plant functional traits (PFT) and soil nutrient availability. We aimed to identify the strongest links in C:N:P stoichiometry among all rhizosphere components. A total of eight grass species (from conservative to exploitative) were grown in pots under two different soil C:nutrient conditions for a month. As a result, a wide gradient of plant–microbial–soil interactions were created. A total of 43 variables of plants, exudates, microbial and soil C:N:P stoichiometry, and PFTs were evaluated. The variables were merged into four groups in a network analysis, allowing us to identify the strongest connections among the variables and the biological meaning of these groups. The plant–soil interactions were shaped by soil N availability. Faster-growing plants were associated with lower amounts of mineral N (and P) in the soil solution, inducing a stronger competition for N with microorganisms in the rhizosphere compared to slower-growing plants. The plants responded by enhancing their N use efficiency and root:shoot ratio, and they reduced N losses via exudation. Root growth was supported either by reallocated foliar reserves or by enhanced ammonium uptake, which connected the specific leaf area (SLA) to the mineral N availability in the soil. Rapid plant growth enhanced the exudation flux. The exudates were rich in C and P relative to N compounds and served to release surplus metabolic products. The exudate C:N:P stoichiometry and soil N availability combined to shape the microbial stoichiometry, and N and P mining. In conclusion, the exudate flux and its C:N:P stoichiometry reflected the plant growth rate and nutrient constraints with a high degree of reliability. Furthermore, it mediated the plant–microbial interactions in the rhizosphere.
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41
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Mahmoudi MR, Bachtobji-Bouachir B, Sebai H, Ben-Attia M, Ghanem-Boughanmi N. Change of the litter fall, decomposition, and nutrient release in cork oak forest after anthropogenic disturbances in North West of Tunisia. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:38584-38593. [PMID: 33738733 DOI: 10.1007/s11356-021-13294-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
In Mediterranean forests, anthropogenic disturbances received little interest in regards to their shrub layer induced enlargement. We studied in the cork oak forest of Beni Métir and in undisturbed and disturbed sites, the relative contribution of the tree (LT, DLT) and shrub (LS, DLS) layers to litter fall, litter decomposition, and nutrients dynamic. Our results showed that disturbance significantly (p < 0.001) reduced (-43%) total litter fall in DS in comparison with S (583 g m-2 year-1); the increased (+ 54%) shrub layer contribution to site litter fall did not counterbalance the decreased input by the tree layer. Leaf litter decomposition was negatively affected (p < 0.001) by disturbance, the remaining mass value being after 2 years, approximately 14 and 33%, respectively, for S and DS. This resulted into a gain of above ground soil organic matter 1.3 higher in DS than it was in S whereas the shrub layer contribution to litter fall increased by 50%. The prevailing driver of decomposition was very probably not related to litter quality but rather site-dependent. Indeed, layers of the same site shared the same remaining mass in spite of significant differences (p < 0.05) in initial content of minerals (N, Ca, and Mn) implicated in biological decomposition. In the disturbed site, the nutrient input by the shrub layer increased by more than double, but its low nutrient quality drastically impaired litter decomposition and mineral return at the site level. In conclusion, this study highlighted the importance of shrub layer which must be taken into account when considering any disturbance assessment and management of Mediterranean forests.
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Affiliation(s)
- Mohamed Riadh Mahmoudi
- Risks Related to Environmental Stress Unity (UR17ES20), Department of Life Sciences, Bizerta Faculty of Sciences, University of Carthage, 7021, Zarzouna, Tunisia
| | - Beya Bachtobji-Bouachir
- Risks Related to Environmental Stress Unity (UR17ES20), Department of Life Sciences, Bizerta Faculty of Sciences, University of Carthage, 7021, Zarzouna, Tunisia
| | - Houcine Sebai
- Higher School of Agriculture of Mograne, University of Carthage, 1121 Mograne, Zaghouan, Tunisia
| | - Mossadok Ben-Attia
- Environment Biomonitoring Laboratory (LR01/ES14), Department of Life Sciences, Bizerta Faculty of Sciences, University of Carthage, 7021, Zarzouna, Tunisia
| | - Néziha Ghanem-Boughanmi
- Risks Related to Environmental Stress Unity (UR17ES20), Department of Life Sciences, Bizerta Faculty of Sciences, University of Carthage, 7021, Zarzouna, Tunisia.
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42
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Runte GC, Smith AH, Moeller HV, Bogar LM. Spheres of Influence: Host Tree Proximity and Soil Chemistry Shape rRNA, but Not DNA, Communities of Symbiotic and Free-Living Soil Fungi in a Mixed Hardwood-Conifer Forest. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.641732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Host and symbiont diversity are inextricably linked across partnerships and ecosystems, with degree of partner reliance governing the strength of this correlation. In many forest soils, symbiotic ectomycorrhizal fungi coexist and compete with free-living saprotrophic fungi, with the outcomes of these interactions shaping resource availability and competitive outcomes for the trees aboveground. Traditional approaches to characterizing these communities rely on DNA sequencing of a ribosomal precursor RNA gene (the internal transcribed spacer region), but directly sequencing the precursor rRNA may provide a more functionally relevant perspective on the potentially active fungal communities. Here, we map ectomycorrhizal and saprotrophic soil fungal communities through a mixed hardwood-conifer forest to assess how above- and belowground diversity linkages compare across these differently adapted guilds. Using highly spatially resolved transects (sampled every 2 m) and well-mapped stands of varying host tree diversity, we sought to understand the relative influence of symbiosis versus environment in predicting fungal diversity measures. Canopy species in this forest included two oaks (Quercus agrifolia and Quercus douglasii) and one pine (Pinus sabiniana). At the scale of our study, spatial turnover in rRNA-based communities was much more predictable from measurable environmental attributes than DNA-based communities. And while turnover of ectomycorrhizal fungi and saprotrophs were predictable by the presence and abundance of different canopy species, they both responded strongly to soil nutrient characteristics, namely pH and nitrogen availability, highlighting the niche overlap of these coexisting guilds and the strong influence of aboveground plants on belowground fungal communities.
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43
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Buessecker S, Zamora Z, Sarno AF, Finn DR, Hoyt AM, van Haren J, Urquiza Muñoz JD, Cadillo-Quiroz H. Microbial Communities and Interactions of Nitrogen Oxides With Methanogenesis in Diverse Peatlands of the Amazon Basin. Front Microbiol 2021; 12:659079. [PMID: 34267733 PMCID: PMC8276178 DOI: 10.3389/fmicb.2021.659079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 05/21/2021] [Indexed: 12/03/2022] Open
Abstract
Tropical peatlands are hotspots of methane (CH4) production but present high variation and emission uncertainties in the Amazon region. This is because the controlling factors of methane production in tropical peats are not yet well documented. Although inhibitory effects of nitrogen oxides (NOx) on methanogenic activity are known from pure culture studies, the role of NOx in the methane cycling of peatlands remains unexplored. Here, we investigated the CH4 content, soil geochemistry and microbial communities along 1-m-soil profiles and assessed the effects of soil NOx and nitrous oxide (N2O) on methanogenic abundance and activity in three peatlands of the Pastaza-Marañón foreland basin. The peatlands were distinct in pH, DOC, nitrate pore water concentrations, C/N ratios of shallow soils, redox potential, and 13C enrichment in dissolved inorganic carbon and CH4 pools, which are primarily contingent on H2-dependent methanogenesis. Molecular 16S rRNA and mcrA gene data revealed diverse and novel methanogens varying across sites. Importantly, we also observed a strong stratification in relative abundances of microbial groups involved in NOx cycling, along with a concordant stratification of methanogens. The higher relative abundance of ammonia-oxidizing archaea (Thaumarchaeota) in acidic oligotrophic peat than ammonia-oxidizing bacteria (Nitrospira) is noteworthy as putative sources of NOx. Experiments testing the interaction of NOx species and methanogenesis found that the latter showed differential sensitivity to nitrite (up to 85% reduction) and N2O (complete inhibition), which would act as an unaccounted CH4 control in these ecosystems. Overall, we present evidence of diverse peatlands likely differently affected by inhibitory effects of nitrogen species on methanogens as another contributor to variable CH4 fluxes.
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Affiliation(s)
- Steffen Buessecker
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Zacary Zamora
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Analissa F Sarno
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Damien Robert Finn
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Alison M Hoyt
- Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, Germany
| | - Joost van Haren
- Biosphere 2 Institute, University of Arizona, Oracle, AZ, United States.,Honors College, University of Arizona, Tucson, AZ, United States
| | - Jose D Urquiza Muñoz
- Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, Germany.,Laboratory of Soil Research, Research Institute of Amazonia's Natural Resources, National University of the Peruvian Amazon, Iquitos, Peru.,School of Forestry, National University of the Peruvian Amazon, Iquitos, Peru
| | - Hinsby Cadillo-Quiroz
- School of Life Sciences, Arizona State University, Tempe, AZ, United States.,Swette Center for Environmental Biotechnology, The Biodesign Institute, Arizona State University, Tempe, AZ, United States.,Center for Fundamental and Applied Microbiomics, The Biodesign Institute, Arizona State University, Tempe, AZ, United States
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44
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Frimpong KA, Abban-Baidoo E, Marschner B. Can combined compost and biochar application improve the quality of a highly weathered coastal savanna soil? Heliyon 2021; 7:e07089. [PMID: 34095583 PMCID: PMC8165396 DOI: 10.1016/j.heliyon.2021.e07089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 04/29/2021] [Accepted: 05/13/2021] [Indexed: 11/17/2022] Open
Abstract
Soil fertility decline is a major constraint to crop production in sub-Saharan Africa. The positive effect of biochar and compost applications on soil fertility has been reported by many authors. In this study, a 30-day laboratory incubation experiment was done using 120 g samples each of a Haplic acrisol amended with corn cob biochar (cbio), rice husk biochar (rbio), coconut husk biochar (coco300 and coco700) or poultry manure compost (compost); and co- composted rice husk biochar (rcocomp) or co-composted corn cob biochar (cococomp) at rates of 1 % w/w amendment: soil, respectively. Other treatments in the study were combined poultry manure compost and corn cob biochar or rice husk biochar (1 % compost + 1% biochar: 1% soil w/w), respectively, to examine their effects on basal soil respiration, soil pH; soil microbial carbon; cation exchange capacity; total organic carbon, total nitrogen and available nitrogen concentration. Biochar and compost applied solely or together, and composted biochar increased soil pH by 0.28-2.29 pH units compared to the un-amended control. Basal respiration from the sole compost or composted rice husk, or corn cob biochar or combined biochar and compost were higher than the un-amended control, which was similar to that from the biochar only treatments. TOC in the sole compost and combined corn cob biochar and compost treatments were up to 37% and 117% higher, respectively, than the control. Combined application of rice husk biochar and compost increased MBC by 132% while sole compost addition increased MBC by 247%, respectively, compared to the control. In conclusion, the study demonstrated that sole or combined application of compost and biochar, or composted biochar improved soil quality parameters such as soil pH and MBC, and promoted soil C stabilization through enhanced TOC and reduced soil C loss through basal respiration.
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Affiliation(s)
- Kwame Agyei Frimpong
- Department of Soil Science, School of Agriculture, College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana
- Corresponding author.
| | - Emmanuel Abban-Baidoo
- Department of Soil Science, School of Agriculture, College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Bernd Marschner
- Department of Soil Science and Soil Ecology, Institute of Geography, Ruhr University, Bochum, Germany
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45
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Hebert TA, Halvorson HM, Kuehn KA. A literature synthesis resolves litter intrinsic constraints on fungal dynamics and decomposition across standing dead macrophytes. OIKOS 2021. [DOI: 10.1111/oik.08174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tori A. Hebert
- School of Biological, Environmental and Earth Sciences, Univ. of Southern Mississippi Hattiesburg MS USA
- Dept of Biology, Univ. of Central Arkansas Conway AR USA
| | - Halvor M. Halvorson
- School of Biological, Environmental and Earth Sciences, Univ. of Southern Mississippi Hattiesburg MS USA
- Dept of Biology, Univ. of Central Arkansas Conway AR USA
| | - Kevin A. Kuehn
- School of Biological, Environmental and Earth Sciences, Univ. of Southern Mississippi Hattiesburg MS USA
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46
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Koceja ME, Bledsoe RB, Goodwillie C, Peralta AL. Distinct microbial communities alter litter decomposition rates in a fertilized coastal plain wetland. Ecosphere 2021. [DOI: 10.1002/ecs2.3619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Megan E. Koceja
- Department of Biology East Carolina University Howell Science ComplexMail Stop 551 Greenville North Carolina27858USA
| | - Regina B. Bledsoe
- Department of Biology East Carolina University Howell Science ComplexMail Stop 551 Greenville North Carolina27858USA
| | - Carol Goodwillie
- Department of Biology East Carolina University Howell Science ComplexMail Stop 551 Greenville North Carolina27858USA
| | - Ariane L. Peralta
- Department of Biology East Carolina University Howell Science ComplexMail Stop 551 Greenville North Carolina27858USA
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47
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Consistent pattern of higher lability of leaves from high latitudes for both native
Phragmites australis
and exotic
Spartina alterniflora. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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48
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Yang R, Dong J, Li C, Wang L, Quan Q, Liu J. The decomposition process and nutrient release of invasive plant litter regulated by nutrient enrichment and water level change. PLoS One 2021; 16:e0250880. [PMID: 33939720 PMCID: PMC8092768 DOI: 10.1371/journal.pone.0250880] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 04/16/2021] [Indexed: 11/25/2022] Open
Abstract
Wetlands are vulnerable to plant invasions and the decomposition of invasive plant litter could make impacts on the ecosystem services of wetlands including nutrient cycle and carbon sequestration. However, few studies have explored the effects of nutrient enrichment and water level change on the decomposition of invasive plant litter. In this study, we conducted a control experiment using the litterbag method to compare the decomposition rates and nutrient release in the litter of an invasive plant Alternanthera philoxeroides in three water levels and two nutrient enrichment treatments. This study found that the water level change and nutrient enrichment showed significant effects on the litter decomposition and nutrient dynamic of A. philoxeroides. The increase of water level significantly reduced the decomposition rate and nutrient release of litter in the nutrient control treatment, whereas no clear relationship was observed in the nutrient enrichment treatment, indicating that the effect of water level change on litter decomposition might be affected by nutrient enrichment. At the late stage of decomposition, the increase of phosphorus (P) concentration and the decrease of the ratio of carbon to P suggested that the decomposition of invasive plant litter was limited by P. Our results suggest that controlling P enrichment in water bodies is essential for the management of invasive plant and carbon sequestration of wetlands. In addition, the new index we proposed could provide a basis for quantifying the impact of invasive plant litter decomposition on carbon cycle in wetlands.
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Affiliation(s)
- Ruirui Yang
- Environment Research Institute, Shandong University, Qingdao, China
| | - Junyu Dong
- Environment Research Institute, Shandong University, Qingdao, China
| | - Changchao Li
- Environment Research Institute, Shandong University, Qingdao, China
| | - Lifei Wang
- Environment Research Institute, Shandong University, Qingdao, China
| | - Quan Quan
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an, China
| | - Jian Liu
- Environment Research Institute, Shandong University, Qingdao, China
- * E-mail:
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49
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Gong H, Li Y, Li S. Effects of the interaction between biochar and nutrients on soil organic carbon sequestration in soda saline-alkali grassland: A review. Glob Ecol Conserv 2021. [DOI: 10.1016/j.gecco.2020.e01449] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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50
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Gill AL, Schilling J, Hobbie SE. Experimental nitrogen fertilisation globally accelerates, then slows decomposition of leaf litter. Ecol Lett 2021; 24:802-811. [PMID: 33583093 DOI: 10.1111/ele.13700] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 12/07/2020] [Accepted: 01/03/2021] [Indexed: 12/24/2022]
Abstract
Plant litter decomposition is a central process in the carbon (C) cycle and sensitive to ongoing anthropogenic nitrogen (N) fertilisation. Previous syntheses evaluating the effect of N fertilisation on litter decomposition relied largely on models that define a constant rate of mass loss throughout decomposition, which may mask hypothesised shifts in the effect of N fertilisation on litter decomposition dynamics. In this meta-analysis, we compared the performance of four empirical decomposition models and showed that N fertilisation consistently accelerates early-stage but slows late-stage decomposition when the model structure allows for flexibility in decomposition rates through time. Within a particular substrate, early-stage N-stimulation of decomposition was associated with reduced rates of late-stage decay. Because the products of early- vs. late-stage decomposition are stabilised in soils through distinct chemical and physical mechanisms, N-induced changes in the litter decomposition process may influence the formation and cycling of soil C, the largest terrestrial C pool.
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Affiliation(s)
- Allison L Gill
- Department of Ecology, Evolution, Behavior, University of Minnesota, Saint Paul, MN, 55108, USA.,Department of Biology, Williams College, Williamstown, MA, 01267, USA
| | - Jonathan Schilling
- Department of Plant & Microbial Biology, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Sarah E Hobbie
- Department of Ecology, Evolution, Behavior, University of Minnesota, Saint Paul, MN, 55108, USA
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