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Wang Z, Chen L, Pan Y, Zhao D, Yang Y, Li X, Wang H. Responses in species diversity in the Hulunbuir grassland to phosphorus addition under nitrogen-limiting and non-limiting conditions. FRONTIERS IN PLANT SCIENCE 2024; 15:1393471. [PMID: 39086909 PMCID: PMC11288950 DOI: 10.3389/fpls.2024.1393471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 07/04/2024] [Indexed: 08/02/2024]
Abstract
The phenomenon of nitrogen deposition resulting in species loss in terrestrial ecosystems has been demonstrated in several experiments. Nitrogen (N) and phosphorus (P), as major nutrients required for plant growth, exhibit ecological stoichiometric coupling in many ecosystems. The increased availability of nitrogen can exacerbate the ecological effects of phosphorus. To reveal the ecological effects of phosphorus under nitrogen-limiting and non-limiting conditions, we conducted a controlled N-P interaction experiment over 5 years in the Hulunbuir meadow steppe, where two nitrogen addition levels were implemented: 0 g N·m-2·a-1 (nitrogen-limiting condition) and 10 g N·m-2·a-1 (nitrogen-non-limiting condition), together with six levels of phosphorus addition (0, 2, 4, 6, 8, and 10 g P·m-2·a-1). The results showed that nitrogen addition (under nitrogen-non-limiting conditions) significantly decreased species diversity in the steppe community, which was exacerbated under phosphorus addition. Under nitrogen-limiting conditions, phosphorus addition had no marked impact on species diversity compared to the control; however, there were substantial differences between different levels of phosphorus addition, exhibiting a unimodal change. Under both experimental nitrogen conditions, the addition of 6 g P·m-2·a-1 was the threshold for affecting the community species diversity. Nitrogen addition reduced the relative biomass of legumes, bunch grasses, and forbs, but substantially increased the relative biomass of rhizomatous grasses. In contrast, phosphorus addition only markedly affected the relative biomass of forbs and rhizomatous grasses, with the former showing a unimodal pattern of first increasing and then decreasing with increasing phosphorus addition level, and the latter exhibiting the opposite pattern. The different responses of rhizomatous grasses and other functional groups to nitrogen and phosphorus addition were observed to have a regulatory effect on the changes in grassland community structure. Phosphorus addition may increase the risk of nitrogen deposition-induced species loss. Both nitrogen and phosphorus addition lead to soil acidification and an increase in the dominance of the already-dominant species, and the consequent species loss in the forb functional group represents the main mechanism for the reduction in community species diversity.
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Affiliation(s)
- Zhihui Wang
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
- Key Laboratory of Low-carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, China
- Agricultural Products and Processed Products Supervision and Testing Center, Ministry of Agriculture, Daqing, China
| | - Li Chen
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
| | - Yuzhen Pan
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
| | - Dan Zhao
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
| | - Yunrui Yang
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
| | - Xinyu Li
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
| | - Hongyi Wang
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqin, China
- Key Laboratory of Low-carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, China
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Sun Y, Chen S, Ouyang H, Liu S. Woody plant species richness and productivity relationship in a subtropical forest: The predominant role of common species. PLoS One 2024; 19:e0306174. [PMID: 38968313 PMCID: PMC11226134 DOI: 10.1371/journal.pone.0306174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 06/12/2024] [Indexed: 07/07/2024] Open
Abstract
A long-standing key issue for examining the relationships between biodiversity and ecosystem functioning (BEF), such as forest productivity, is whether ecosystem functions are influenced by the total number of species or the properties of a few key species. Compared with controlled ecosystem experiments, the BEF relationships in secondary forest remain unclear, as do the effects of common species richness and rare species richness on the variation in ecosystem functions. To address this issue, we conducted field surveys at five sampling sites (1 ha each) with subtropical secondary evergreen broad-leaved forest vegetation. We found (1) a positive correlation between species richness and standing aboveground biomass (AGB); (2) that common species were primarily responsible for the distribution patterns of species abundance and dominance; although they accounted for approximately 25% of the total species richness on average, they represented 86-91% of species abundance and 88-97% of species dominance; and (3) that common species richness could explain much more of the variation in AGB than total species richness (common species plus rare species) at both the site and plot scales. Because rare species and common species were not equivalent in their ability to predict productivity in the biodiversity-ecosystem productivity model, redundant information should be eliminated to obtain more accurate results. Our study suggested that woody plant species richness and productivity relationship in subtropical forest ecosystem can be explained and predicted by a few common species.
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Affiliation(s)
- Yudan Sun
- College of Life Science and Technology, LingNan Normal University, Zhanjiang, China
| | - Silin Chen
- College of Life Science and Technology, LingNan Normal University, Zhanjiang, China
| | - Haofeng Ouyang
- College of Life Science and Technology, LingNan Normal University, Zhanjiang, China
| | - Shuang Liu
- College of Life Science and Technology, LingNan Normal University, Zhanjiang, China
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Xiao H, Li P, Monaco TA, Liu Y, Rong Y. Nitrogen and phosphorus additions alter foliar nutrient concentrations of dominant grass species and regulate primary productivity in an Inner Mongolian meadow steppe. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168791. [PMID: 38000742 DOI: 10.1016/j.scitotenv.2023.168791] [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: 05/29/2023] [Revised: 10/25/2023] [Accepted: 11/20/2023] [Indexed: 11/26/2023]
Abstract
Excessive nitrogen (N) inputs shift grassland productivity from nitrogen (N) to phosphorus (P) limitation. However, how plant nutrient concentrations and stoichiometric dynamics at community and species level responding to variable soil N and P availability, and their roles in regulating net primary productivity in meadow steppe remain unclear. To address this issue, we carried out an experiment with fifteen treatments consisting of factorial combinations of N (0, 1.55, 4.65,13.95, 27.9 g N m-2 yr-1) and P (0, 5.24,10.48 g P m-2 yr-1) for three years in a meadow steppe in Inner Mongolia. We examined concentrations and stoichiometry of C (carbon), N, P in plants and soils, and their associations with plant primary productivity. Results revealed mean community N:P ratios for shoots (12.89 ± 0.98) did not exceed 14 within the control treatment, indicating that plant growth was primarily N-limited in this ecosystem. Shoot N:P ratios were significantly increased by N addition (>16 when N application rate above 4.65 g N m-2 yr-1), shifting the community from N- to P-limited whereas significantly reduced by P addition (N:P ratios <14), further aggravating N limitation. N addition increased leaf-N concentrations whereas decreased leaf C:N ratios of all four species, but only the values for two graminoid species were significantly influenced by P addition. Leaf-P concentrations significantly increased for graminoids but significantly decreased for forbs with the application of N. VPA analysis revealed that aboveground components, especially in grass leaves, explained more variation in aboveground net primary productivity (ANPP) and belowground net primary productivity (BNPP) than root and soil components. For grasses, leaf-N concentrations showed high association with ANPP, while leaf-P concentrations were associated with BNPP. These results highlight that N and P depositions could affect the leaf-nutrient concentrations of dominant grasses, and thereby potentially alter net primary productivity in meadow steppe.
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Affiliation(s)
- Hong Xiao
- College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China; Grassland Ecosystem Key Laboratory of Ministry of Education, College of Pratacultural Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China
| | - Pengzhen Li
- College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China
| | - Thomas A Monaco
- U.S. Department of Agriculture, Agricultural Research Service, Forage and Range Research Laboratory, Utah State University, Logan, UT 84322-6300, USA
| | - Yuling Liu
- College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China
| | - Yuping Rong
- College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China.
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Chen X, Hou G, Shi P, Zong N, Yu J. Functional Groups Dominate Aboveground Net Primary Production under Long-Term Nutrient Additions in a Tibetan Alpine Meadow. PLANTS (BASEL, SWITZERLAND) 2024; 13:344. [PMID: 38337876 PMCID: PMC10857096 DOI: 10.3390/plants13030344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/09/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024]
Abstract
Anthropogenic nutrient additions are influencing the structure and function of alpine grassland ecosystems. However, the underlying mechanisms of the direct and indirect effects of nutrient additions on aboveground net primary productivity (ANPP) are not well understood. In this study, we conducted an eight-year field experiment to explore the ecological consequences of nitrogen (N) and/or phosphorous (P) additions on the northern Tibetan Plateau. ANPP, species diversity, functional diversity, and functional groups were used to assess species' responses to increasing nutrients. Our results showed that nutrient additions significantly increased ANPP due to the release in nutrient limitations. Although N addition had a significant effect on species richness and functional richness, and P and N + P additions altered functional diversity, it was functional groups rather than biodiversity that drove changes in ANPP in the indirect pathways. We identified the important roles of N and P additions in begetting the dominance of grasses and forbs, respectively. The study highlights that the shift of functional groups should be taken into consideration to better predict the structure, function, and biodiversity-ANPP relationship in grasslands, particularly under future multifaceted global change.
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Affiliation(s)
- Xueying Chen
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (X.C.); (G.H.); (N.Z.); (J.Y.)
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Ge Hou
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (X.C.); (G.H.); (N.Z.); (J.Y.)
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Peili Shi
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (X.C.); (G.H.); (N.Z.); (J.Y.)
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Ning Zong
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (X.C.); (G.H.); (N.Z.); (J.Y.)
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Jialuo Yu
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (X.C.); (G.H.); (N.Z.); (J.Y.)
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
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Guo H, Quan Q, Niu S, Li T, He Y, Fu Y, Li J, Wang J, Zhang R, Li Z, Tian D. Shifting biomass allocation and light limitation co-regulate the temporal stability of an alpine meadow under eutrophication. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 860:160411. [PMID: 36574548 DOI: 10.1016/j.scitotenv.2022.160411] [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: 09/07/2022] [Revised: 11/18/2022] [Accepted: 11/18/2022] [Indexed: 06/17/2023]
Abstract
Eutrophication generally promotes but destabilizes grassland productivity. Under eutrophication, plants tend to decrease biomass allocation to roots but increase aboveground allocation and light limitation, likely affecting community stability. However, it remains unclear to understand how shifting plant biomass allocation and light limitation regulate grassland stability in response to eutrophication. Here, using a 5-yr multiple nutrient addition experiment in an alpine meadow, we explored the role of changes in plant biomass allocation and light limitation on its community stability under eutrophication as well as traditionally established mechanisms (i.e., plant Shannon diversity, species asynchrony and grass subcommunity stability). Our results showed that nitrogen (N) addition, rather than phosphorus (P) or potassium (K) addition, significantly reduced the temporal stability of the alpine meadow. In accordance with previous studies, we found that N addition decreased plant Shannon diversity, species asynchrony and grass subcommunity stability, further destabilizing meadow community productivity. In addition, we also found the decrease in biomass allocation to belowground by N addition, further weakening its community stability. Moreover, this shifts in plant biomass allocation from below- to aboveground, intensifying plant light limitation. Further, the light limitation reduced plant species asynchrony, which finally weakened its community stability. Overall, in addition to traditionally established mechanisms, this study highlights the role of plant biomass allocation shifting from belowground to aboveground in determining grassland community stability. These "unseen" mechanisms might improve our understanding of grassland stability in the context of ongoing eutrophication.
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Affiliation(s)
- Hongbo Guo
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
| | - Quan Quan
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Shuli Niu
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tingting Li
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Yicheng He
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China
| | - Yiwen Fu
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; College of Environmental Mapping and Engineering, Suzhou University, Suzhou, Anhui 234000, China
| | - Jiapu Li
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Jinsong Wang
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Ruiyang Zhang
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Zhaolei Li
- College of Resources and Environment and Academy of Agricultural Sciences, Southwest University, Chongqing 400715, China
| | - Dashuan Tian
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
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Xu S, Yuan Y, Song P, Cui M, Zhao R, Song X, Cao M, Zhang Y, Yang J. The spatial patterns of diversity and their relationships with environments in rhizosphere microorganisms and host plants differ along elevational gradients. Front Microbiol 2023; 14:1079113. [PMID: 36910236 PMCID: PMC9996296 DOI: 10.3389/fmicb.2023.1079113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 02/01/2023] [Indexed: 02/25/2023] Open
Abstract
Introduction Identifying spatial patterns of biodiversity along elevational gradients provides a unified framework for understanding these patterns and predicting ecological responses to climate change. Moreover, microorganisms and plants are closely interconnected (e.g., via the rhizosphere) and thus may share spatial patterns of diversity and show similar relationships with environments. Methods This study compared diversity patterns and relationships with environments in host plants and rhizosphere microorganisms (including various functional groups) along elevational gradients across three climatic zones. Results We found that above-and belowground diversity decreased monotonically or showed a hump-shaped or U-shaped pattern along elevation gradients. However, the diversity patterns of plants, bacteria, and fungi varied depending on the taxon and climatic zone. Temperature and humidity strongly contribute to above-and belowground diversity patterns and community composition along elevational gradients. Nonetheless, soil factors might be important regulators of diversity patterns and the community composition of plants and microorganisms along these gradients. Structural equation modeling revealed that environmental factors had a stronger direct effect on rhizosphere microbial diversity than host plant diversity. Discussion In sum, spatial patterns of diversity and their relationships with environments in rhizosphere microorganisms and their host plants differed at the regional scale. Different functional groups (e.g., pathogen, mycorrhiza and nitrifier) of soil microorganisms may have divergent elevational patterns and environmental responses. These data improve our understanding of elevational diversity patterns, and provide new insights into the conservation of biodiversity and ecosystem management, especially under climate change.
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Affiliation(s)
- Shijia Xu
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.,School of Ethnic Medicine, Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission and Ministry of Education of China, Yunnan Minzu University, Kunming, Yunnan, China
| | - Yan Yuan
- School of Ethnic Medicine, Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission and Ministry of Education of China, Yunnan Minzu University, Kunming, Yunnan, China
| | - Pengfei Song
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.,School of Ethnic Medicine, Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission and Ministry of Education of China, Yunnan Minzu University, Kunming, Yunnan, China
| | - Mufeng Cui
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.,School of Ethnic Medicine, Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission and Ministry of Education of China, Yunnan Minzu University, Kunming, Yunnan, China
| | - Rensheng Zhao
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.,School of Ethnic Medicine, Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission and Ministry of Education of China, Yunnan Minzu University, Kunming, Yunnan, China
| | - Xiaoyang Song
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Min Cao
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Yazhou Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Jie Yang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
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Xu F, Li J, Wu L, Su J, Wang Y, Chen D, Bai Y. Linking leaf traits to the temporal stability of above- and belowground productivity under global change and land use scenarios in a semi-arid grassland of Inner Mongolia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 818:151858. [PMID: 34822882 DOI: 10.1016/j.scitotenv.2021.151858] [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: 09/17/2021] [Revised: 11/17/2021] [Accepted: 11/17/2021] [Indexed: 06/13/2023]
Abstract
The biotic drivers for the temporal stability of aboveground net productivity (ANPP) in natural ecosystems are well understood. However, knowledge gaps still exist regarding the relative importance of biotic and abiotic drivers regulating the temporal stability of aboveground productivity (ANPP), belowground net productivity (BNPP), and community net productivity (NPP) under global change and land use scenarios. Thus, in this study, we aimed to study the effects of increased water and nitrogen availability on temporal stability of ANPP, BNPP, and NPP and underlying mechanisms at sites with different long-term grazing histories in typical grasslands of the Inner Mongolia. The results suggested that resource addition affected the ANPP stability, but it did not change the stability of BNPP and NPP, which were all mediated by grazing histories. Most importantly, our study further indicated that species asynchrony, primarily contributed to the stability of ANPP and NPP by weakening their variation, and species asynchrony was regulated directly by plant diversity-related variables and indirectly by soil variables which were affected by resource addition and grazing history. In addition, an increase of ANPP stimulated under resource addition was a secondary contributor to ANPP stability. Specifically, the community-weighted mean of specific leaf area (CWM SLA) regulated the ANPP stability indirectly by promoting species asynchrony, while functional diversity of leaf area and SLA both directly controlled the BNPP stability. Findings of our study demonstrate that different mechanisms drove temporal stability of above- and belowground productivity. Our study has important implications for maintaining the temporal stability of community productivity and for establishing sustainable management practices of semi-arid grasslands under global change and land use scenarios.
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Affiliation(s)
- Fengwei Xu
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; Research Institute of Ecological Protection and Restoration, Chinese Academy of Forestry, Beijing 100091, China; Grassland Research Center, National Forestry and Grassland Administration, Beijing 100091, China.
| | - Jianjun Li
- Collaborative Innovation Center of Jiangxi Typical Trees Cultivation and Utilization, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China
| | - Liji Wu
- College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
| | - Jishuai Su
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Yang Wang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Dima Chen
- College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
| | - Yongfei Bai
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; College of Resources and Environment, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China.
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Effects of 5-Year Nitrogen Addition on Species Composition and Diversity of an Alpine Steppe Plant Community on Qinghai-Tibetan Plateau. PLANTS 2022; 11:plants11070966. [PMID: 35406946 PMCID: PMC9002499 DOI: 10.3390/plants11070966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/26/2022] [Accepted: 03/29/2022] [Indexed: 11/29/2022]
Abstract
The N deposition rate is notably increased in China, especially in the Qinghai-Tibetan Plateau (QTP). How plants respond to the projected N deposition on the alpine steppe is still in debate. In this study, to investigate the effects of N deposition on the plant community of the alpine steppe, we simulated N deposition at six different N addition rate levels (0, 8, 24, 40, 56, 72 kg N ha−1 y−1) from 2015 to 2019. Species composition and diversity were investigated as the assessment indices. The results showed that the importance value of grasses significantly increased with the increase of the N addition rate, while that of forbs significantly decreased. A high N addition rate (72 kg N ha−1 y−1) induced species composition change, making Leymus secalinus become the most dominant species within the entire plant community. Compared with the control (without N addition), species richness, Shannon–Weiner diversity, Simpson dominance and Pielou Evenness were significantly reduced under a high N addition rate. The changes of plant diversity in the alpine steppe were closely correlated with dynamics of soil nutrients, especially total carbon (TC), total phosphorus (TP) and ammonia nitrogen (NH4-N). Our findings suggested that a high N deposition rate (72 kg N ha−1 y−1) could significantly change plant composition and reduce the diversity of the alpine steppe, though they were less affected by low N deposition rates at present. With the increase of the N deposition rate, plant composition and diversity of the alpine steppe may be negatively affected in the future. In addition, Leymus secalinus is more competitive than other species with an N deposition rate increase. Soil C, soil P and soil NH4-N variation induced by N deposition might play a key role in regulating changes in plant composition and diversity in the alpine steppe. In addition, longer term field investigation needs to be carried out to testify to this phenomenon with the increase of N deposition in the future.
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Assessing the roles of nitrogen, biomass, and niche dimensionality as drivers of species loss in grassland communities. Proc Natl Acad Sci U S A 2022; 119:e2112010119. [PMID: 35235460 PMCID: PMC8915794 DOI: 10.1073/pnas.2112010119] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Nutrient enrichment of natural ecosystems is a primary characteristic of the Anthropocene and a known cause of biodiversity loss, particularly in grasslands. In a global meta-analysis of 630 resource addition experiments, we conduct a simultaneous test of the three most prominent explanations of this phenomenon. Our results conclusively indicate that nitrogen is the leading cause of species loss. This result is important because of the increase in nitrogen deposition and the frequent use of nitrogen-based fertilizers worldwide. Our findings provide global-scale, experimental evidence that minimizing nitrogen inputs to ecological systems may help to conserve the diversity of grassland ecosystems. Eutrophication is a major driver of species loss in plant communities worldwide. However, the underlying mechanisms of this phenomenon are controversial. Previous studies have raised three main explanations: 1) High levels of soil resources increase standing biomass, thereby intensifying competitive interactions (the “biomass-driven competition hypothesis”). 2) High levels of soil resources reduce the potential for resource-based niche partitioning (the “niche dimension hypothesis”). 3) Increasing soil nitrogen causes stress by changing the abiotic or biotic conditions (the “nitrogen detriment hypothesis”). Despite several syntheses of resource addition experiments, so far, no study has tested all of the hypotheses together. This is a major shortcoming, since the mechanisms underlying the three hypotheses are not independent. Here, we conduct a simultaneous test of the three hypotheses by integrating data from 630 resource addition experiments located in 99 sites worldwide. Our results provide strong support for the nitrogen detriment hypothesis, weaker support for the biomass-driven competition hypothesis, and negligible support for the niche dimension hypothesis. The results further show that the indirect effect of nitrogen through its effect on biomass is minor compared to its direct effect and is much larger than that of all other resources (phosphorus, potassium, and water). Thus, we conclude that nitrogen-specific mechanisms are more important than biomass or niche dimensionality as drivers of species loss under high levels of soil resources. This conclusion is highly relevant for future attempts to reduce biodiversity loss caused by global eutrophication.
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Zheng S, Chi Y, Yang X, Li W, Lan Z, Bai Y. Direct and indirect effects of nitrogen enrichment and grazing on grassland productivity through intraspecific trait variability. J Appl Ecol 2021. [DOI: 10.1111/1365-2664.14078] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuxia Zheng
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
| | - Yonggang Chi
- College of Geography and Environmental Sciences Zhejiang Normal University Jinhua China
| | - Xiaojing Yang
- School of Geography and Tourism Shaanxi Normal University Xi'an China
| | - Wenhuai Li
- School of Ecology and Environment Inner Mongolia University Hohhot China
| | - Zhichun Lan
- Observation and Research Station for the Wetland Ecosystem of Lake Poyang Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Lushan China
| | - Yongfei Bai
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
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11
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Effect of Short-Term Low-Nitrogen Addition on Carbon, Nitrogen and Phosphorus of Vegetation-Soil in Alpine Meadow. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182010998. [PMID: 34682742 PMCID: PMC8536122 DOI: 10.3390/ijerph182010998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/11/2021] [Accepted: 10/15/2021] [Indexed: 12/05/2022]
Abstract
As one of the nitrogen (N) limitation ecosystems, alpine meadows have significant effects on their structure and function. However, research on the response and linkage of vegetation-soil to short-term low-level N deposition with rhizosphere processes is scant. We conducted a four level N addition (0, 20, 40, and 80 kg N ha−1 y−1) field experiment in an alpine meadow on the Qinghai-Tibetan Plateau (QTP) from July 2014 to August 2016. We analyzed the community characteristics, vegetation (shoots and roots), total carbon (TC), nutrients, soil (rhizosphere and bulk) properties, and the linkage between vegetation and soil under different N addition rates. Our results showed that (i) N addition significantly increased and decreased the concentration of soil nitrate nitrogen (NO3−-N) and ammonium nitrogen, and the soil pH, respectively; (ii) there were significant correlations between soil (rhizosphere and bulk) NO3−-N and total nitrogen (TN), and root TN, and there was no strong correlation between plant and soil TC, TN and total phosphorus, and their stoichiometry under different N addition rates. The results suggest that short-term low-N addition affected the plant community, vegetation, and soil TC, TN, TP, and their stoichiometry insignificantly, and that the correlation between plant and soil TC, TN, and TP, and their stoichiometry were insignificant.
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12
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Xu X, Qin L, Ren L, Wang C, Zhang Y, Zhang L. Comparative analysis of chronic rhinitis patient profiles during autumn pollen season between grassland and non-grassland cities in North China. Allergy Asthma Clin Immunol 2021; 17:106. [PMID: 34635159 PMCID: PMC8503993 DOI: 10.1186/s13223-021-00591-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/24/2021] [Indexed: 11/11/2022] Open
Abstract
Background The symptoms of patients with respiratory disease are influenced by local environmental factors. The incidence of allergic rhinitis in grassland areas was significantly higher than that in non-grassland areas. We aimed to compare the profiles of chronic rhinitis patients obtained during the autumn pollen season in Baotou (grassland city) and Beijing (non-grassland city), China. Methods Questionnaire surveys and allergen testing were conducted on 1170 and 1232 patients with chronic rhinitis visiting the Second Affiliated Hospital of Baotou Medical College and Beijing Tongren Hospital, respectively, during the autumn pollen period. Information regarding medical history, severity of symptoms, and diagnosis and treatment was collected. Results More patients with moderate to severe chronic rhinitis and asthma (both, P < 0.001) were present in Baotou than in Beijing. Mugwort was the most abundant allergen in both regions, but the number of patients sensitized to outdoor allergens in Baotou was higher than that in Beijing (P < 0.001). Indoor allergens in Beijing represented a considerable proportion of allergens, especially dust mites (33.4%). For patients with allergic rhinitis, nasal congestion, nasal itching, and runny nose were more severe in Baotou than in Beijing (P < 0.001). In both Baotou and Beijing, allergy (P < 0.001 vs. P = 0.004) and combined asthma (P = 0.049 vs. P = 0.005) were common factors affecting the severity of the clinical symptoms chronic rhinitis. In Baotou, age (rs = 0.195, P < 0.001) and family allergy history (P = 0.010) were also associated with symptom severity. Although significantly more patients in Baotou received oral antihistamines, nasal corticosteroids, and surgical treatment than in Beijing (P < 0.001), the number of people receiving allergy immunotherapy in Baotou was lower (P = 0.004) and post-treatment symptom control was worse (P < 0.001) that that in Beijing. Conclusions During the pollen period, there were significant differences in the allergen spectrum between Baotou and Beijing. Allergy and combined asthma were common factors affecting the severity of clinical symptoms. Patients in Baotou presented with more severe clinical symptoms that were not satisfactorily managed due to the impact of pollen exposure, inconsistent access to care, and differing treatment modalities. Supplementary Information The online version contains supplementary material available at 10.1186/s13223-021-00591-w.
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Affiliation(s)
- Xu Xu
- Department of Otolaryngology Head and Neck Surgery, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, No. 17, Hou Gou Hu Tong, Dong Cheng District, 100005, Beijing, People's Republic of China.,Department of Allergy, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China
| | - Long Qin
- The Second Affiliated Hospital of Baotou Medical College, Baotou Medical College, Baotou, China
| | - Lei Ren
- Department of Allergy, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China
| | - Chengshuo Wang
- Department of Otolaryngology Head and Neck Surgery, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, No. 17, Hou Gou Hu Tong, Dong Cheng District, 100005, Beijing, People's Republic of China
| | - Yuan Zhang
- Department of Otolaryngology Head and Neck Surgery, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China. .,Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, No. 17, Hou Gou Hu Tong, Dong Cheng District, 100005, Beijing, People's Republic of China. .,Department of Allergy, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China.
| | - Luo Zhang
- Department of Otolaryngology Head and Neck Surgery, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China. .,Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, No. 17, Hou Gou Hu Tong, Dong Cheng District, 100005, Beijing, People's Republic of China. .,Department of Allergy, Beijing Tong Ren Hospital, Capital Medical University, Beijing, China.
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13
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He K, Huang Y, Qi Y, Sheng Z, Chen H. Effects of nitrogen addition on vegetation and soil and its linkages to plant diversity and productivity in a semi-arid steppe. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 778:146299. [PMID: 34030349 DOI: 10.1016/j.scitotenv.2021.146299] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 03/02/2021] [Accepted: 03/02/2021] [Indexed: 05/17/2023]
Abstract
Nitrogen (N) deposition and fertilization, which represent key sources of N input in many terrestrial ecosystems, influence all levels of the ecosystem and involve complex mechanisms. Quantitative and modelling approaches can be used to understand this complexity. In this study, we carried out in situ N addition experiments in a Stipa krylovii steppe in northern China. We evaluated the effects of N addition on plant diversity and productivity under two scenarios (fertilization and simulated increased N deposition) using a structural equation model (SEM). N addition had direct effects on community weighted means (CWM) of plant functional traits and soil properties but had indirect effects on community structure. The changes in community structure and soil properties caused by N addition decreased plant diversity, whereas productivity remained relatively stable and was mainly controlled by changes in community structure. The changes in soil properties and plant diversity caused by N addition had little effect on productivity or soil pH. We conclude that the changes in plant diversity and productivity with increased N input in the S. krylovii steppe were mainly due to differences in growth responses of different species to increased N and the resulting community responses, such as changes in community structure. The results of the present study provide a theoretical basis for grassland management and conservation in the wake of global environmental change.
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Affiliation(s)
- Kejian He
- School of Earth Sciences, Yunnan Institute of Geography, Yunnan University, Kunming 560091, China
| | - Yongmei Huang
- State Key Laboratory of Earth Surface and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China.
| | - Yu Qi
- Inner Mongolia Research Academy of Environmental Sciences, Hohhot 010011, China
| | - Zhilu Sheng
- State Key Laboratory of Earth Surface and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China.
| | - Huiying Chen
- State Key Laboratory of Earth Surface and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China.
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14
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Species identities impact the responses of intensity and importance of competition to the soil fertility changes. Glob Ecol Conserv 2021. [DOI: 10.1016/j.gecco.2021.e01519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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15
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Lu X, Zhao X, Tachibana T, Uchida K, Sasaki T, Bai Y. Plant quantity and quality regulate the diversity of arthropod communities in a semi‐arid grassland. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaoming Lu
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
| | - Xuezhen Zhao
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
- College of Lifesciences University of Chinese Academy of Sciences Beijing China
| | - Taiki Tachibana
- Graduate School of Environment and Information Sciences Yokohama National University Hodogaya Yokohama Japan
| | - Kei Uchida
- Institute for Sustainable Agro‐ecosystem Services The University of Tokyo Nishi‐Tokyo Japan
| | - Takehiro Sasaki
- Graduate School of Environment and Information Sciences Yokohama National University Hodogaya Yokohama Japan
| | - Yongfei Bai
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
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16
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Rong X, Sun Y, Fan M, Wang H. Stoichiometric Modeling of Aboveground-Belowground Interaction of Herbaceous Plant and Two Herbivores. Bull Math Biol 2020; 82:107. [PMID: 32770322 DOI: 10.1007/s11538-020-00784-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 07/23/2020] [Indexed: 10/23/2022]
Abstract
In a grassland ecosystem, the dynamics and coexistence mechanisms of two herbivores competing for one herbaceous plant have been widely studied, while the chemical heterogeneity of herbaceous plant's aboveground and belowground parts is usually ignored in dynamic modeling. Based on the traditional two herbivore-one herbaceous plant competition model, a new stoichiometric competition model, which incorporates the chemical heterogeneity of herbaceous plants, is formulated to investigate effects of the aboveground-belowground interactions and the chemical heterogeneity on the dynamics of the two herbivore-one herbaceous plant system. We perform theoretical analysis for the stability of boundary equilibria and show that a stable coexistent equilibrium is possible with two herbivores on one herbaceous plant. Moreover, numerical simulations reveal that various light intensity and nitrogen input can also allow all populations to coexist in periodic oscillations or irregularly cyclic oscillations. Our findings further indicate that when the nitrogen input is fixed, higher light intensity leads to a dominance of the lower N-demand herbivore, while the light intensity is fixed, higher nitrogen input leads to a dominance of the higher N-demand herbivore. Moderate levels of light and nutrient could promote the coexistence of two herbivores and herbaceous plant. This study also explains the functional mechanism for the decline of species diversity in response to nitrogen enrichment.
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Affiliation(s)
- Xinmiao Rong
- School of Mathematics and Statistics, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, Jilin, People's Republic of China.,College of Mathematical Sciences, Harbin Engineering University, Harbin, Heilongjiang, 150001, People's Republic of China
| | - Yazhou Sun
- School of Mathematics and Statistics, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, Jilin, People's Republic of China
| | - Meng Fan
- School of Mathematics and Statistics, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, Jilin, People's Republic of China.
| | - Hao Wang
- Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, AB, T6G 2G1, Canada
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17
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Peng Y, Chen HYH, Yang Y. Global pattern and drivers of nitrogen saturation threshold of grassland productivity. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13622] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yunfeng Peng
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
| | - Han Y. H. Chen
- Faculty of Natural Resources Management Lakehead University Thunder Bay ON Canada
| | - Yuanhe Yang
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing China
- University of Chinese Academy of Sciences Beijing China
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18
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Xie D, Zhao B, Wang S, Duan L. Benefit of China's reduction in nitrogen oxides emission to natural ecosystems in East Asia with respect to critical load exceedance. ENVIRONMENT INTERNATIONAL 2020; 136:105468. [PMID: 31935562 DOI: 10.1016/j.envint.2020.105468] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 10/27/2019] [Accepted: 01/04/2020] [Indexed: 06/10/2023]
Abstract
The emission of nitrogen oxides (NOx) in China decreased by 15% from 2010 to 2015 (without a significant decrease in NH3 emission), resulting in the decline of nitrogen (N) deposition in East Asia. Empirical N critical load exceedance was used to assess the benefit of the NOx emission reduction in China to natural ecosystems in East Asia. Empirical N critical loads for major forest and grassland types in East Asia were assigned based on field manipulation experiments for N effects. The critical load map based on the minimum of the critical load range of each vegetation type showed that empirical critical loads were generally lower in the Tibetan Plateau and some parts of northeastern China (≤5 kgN·ha-1·a-1), and higher in northern and southern China (≥20 kgN·ha-1·a-1). Empirical critical loads were also low in some parts of central and northern Japan (≤5 kgN·ha-1·a-1) and the south Korean Peninsula (5-10 kgN·ha-1·a-1). As a benefit of NOx emission reduction in China, N deposition in East Asia decreased significantly from 2010 to 2015. The total area and total amount of critical load exceedance in East Asia declined 4.6% and 14.3% respectively, suggesting great benefits to natural ecosystems.
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Affiliation(s)
- Danni Xie
- State Key Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Bin Zhao
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Shuxiao Wang
- State Key Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China; Collaborative Innovation Centre for Regional Environmental Quality, Tsinghua University, Beijing, 100084, PR China
| | - Lei Duan
- State Key Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China; Collaborative Innovation Centre for Regional Environmental Quality, Tsinghua University, Beijing, 100084, PR China.
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19
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Ma T, Wang X, Zhuang Y, Shi H, Ning H, Lan T, Zhang T, Kang Z, SiQin B, Yang B, Bao X, Yan W, Lei T, Wang D, Shan G, Zhang B, Wang X, Zhang L. Prevalence and risk factors for allergic rhinitis in adults and children living in different grassland regions of Inner Mongolia. Allergy 2020; 75:234-239. [PMID: 31169905 DOI: 10.1111/all.13941] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Tingting Ma
- Department of Allergy Beijing Shijitan Hospital Capital Medical University Beijing China
| | - Xiangdong Wang
- Department of Otolaryngology Head and Neck Surgery Beijing TongRen Hospital Beijing Key Laboratory of Nasal Diseases Beijing Institute of Otolaryngology Capital Medical University Beijing China
| | - Yan Zhuang
- Department of Allergy Beijing Shijitan Hospital Capital Medical University Beijing China
| | - Haiyun Shi
- Department of Allergy Beijing Shijitan Hospital Capital Medical University Beijing China
| | - Huiyu Ning
- Department of Allergy Beijing Shijitan Hospital Capital Medical University Beijing China
| | - Tianfei Lan
- Department of Allergy Beijing Shijitan Hospital Capital Medical University Beijing China
| | - Tiejun Zhang
- Jarud People's HospitalJarud Banner, Tongliao Inner Mongolia China
| | - Zhenxiang Kang
- Erenhot Community Health Service Center Erenhot Inner Mongolia China
| | - Bate SiQin
- Xilingol Mongolian Hospital Xilinhot Inner Mongolia China
| | - Bate Yang
- Xiwu People's Hospital Xiwu Banner Inner Mongolia China
| | - Xiuzhi Bao
- Kailu People's Hospital Kailu County Tongliao Inner Mongolia China
| | - Weijun Yan
- Duolun People's Hospital Duolun Inner Mongolia China
| | - Tong Lei
- TongliaoCity Hospital Tongliao Inner Mongolia China
| | - Deyun Wang
- Department of Otolaryngology Yong Loo Lin School of Medicine National University of Singapore Singapore Singapore
| | - Guangliang Shan
- Department of Epidemiology and Statistics Institute of Basic Medical Sciences Chinese Academy of Medical Sciences School of Basic Medicine Peking Union Medical College Beijing China
| | - Biao Zhang
- Department of Epidemiology and Statistics Institute of Basic Medical Sciences Chinese Academy of Medical Sciences School of Basic Medicine Peking Union Medical College Beijing China
| | - Xueyan Wang
- Department of Allergy Beijing Shijitan Hospital Capital Medical University Beijing China
| | - Luo Zhang
- Department of Otolaryngology Head and Neck Surgery Beijing TongRen Hospital Beijing Key Laboratory of Nasal Diseases Beijing Institute of Otolaryngology Capital Medical University Beijing China
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20
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Liu X, Wang G, Ran Y, Qi D, Han G, Guan B, Hao C. Overall supply level, not the relative supply of nitrogen and phosphorus, affects the plant community composition of a supratidal wetland in the Yellow River Delta. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 695:133866. [PMID: 31422323 DOI: 10.1016/j.scitotenv.2019.133866] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 08/01/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Human activities have altered the environmental nitrogen (N) and phosphorus (P) supply from both aspects of overall supply level and relative supply ratio. However, the effects of the two aspects on plant community composition are still not clear. In this study, a field manipulation experiment combining 3 overall nutrient supply levels (Low, Medium and High) and 3 N:P supply ratios (5,1, 15:1 and 45:1) was conducted in a supratidal wetland in the Yellow River Delta from 2015 to 2018. The effects of the two aspects on soil properties, performance of dominant species and plant community diversity were examined. The results showed that the N:P supply ratio and overall supply level both affected the concentration of soil inorganic N and available P, and N:P ratio significantly, while only overall supply level exerted a significant effect on the importance value of the dominant species, species richness and Shannon diversity. There were big gaps in the N and P supply amounts among the treatments that having same overall supply level with different supply ratio, but the plant composition displayed no significant difference among these treatments, which suggested that P may be also very important in affecting plant community composition in the study area. The species richness and the Shannon diversity were negatively correlated with the importance value of Suaeda glauca. With the rise of overall supply level, S. glauca became increasingly dominant and suppressed other species. Compared with the control treatment, the species richness and the Shannon diversity declined significantly only at high supply level (minimum N supply amount of 26.01 g m-2 yr-1), indicated that the supratidal wetland had high resilience to nutrient enrichment. Our results revealed that the N:P supply ratio has little influence on plant composition, compared with overall supply, in relative short-term in the supratidal wetland.
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Affiliation(s)
- Xiaoling Liu
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Guangmei Wang
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Yuenan Ran
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Dehua Qi
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangxuan Han
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bo Guan
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chunyan Hao
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China
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21
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Chi Y, Xu Z, Zhou L, Yang Q, Zheng S, Li S. Differential roles of species richness versus species asynchrony in regulating community stability along a precipitation gradient. Ecol Evol 2019; 9:14244-14252. [PMID: 31938515 PMCID: PMC6953564 DOI: 10.1002/ece3.5857] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 10/18/2019] [Accepted: 10/28/2019] [Indexed: 11/29/2022] Open
Abstract
Plant community may provide products and services to humans. However, patterns and drivers of community stability along a precipitation gradient remain unclear. A regional-scale transect survey was conducted over a 3-year period from 2013 to 2015, along a precipitation gradient from 275 to 555 mm and spanning 440 km in length from west to east in a temperate semiarid grassland of northern China, a central part of the Eurasian steppe. Our study provided regional-scale evidence that the community stability increased with increasing precipitation in the semiarid ecosystem. The patterns of community stability along a precipitation gradient were ascribed to community composition and community dynamics, such as species richness and species asynchrony, rather than the abiotic effect of precipitation. Species richness regulated the temporal mean (μ) of aboveground net primary productivity (ANPP), while species asynchrony regulated the temporal standard deviation (σ) of ANPP, which in turn contributed to community stability. Our findings highlight the crucial role of community composition and community dynamics in regulating community stability under climate change.
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Affiliation(s)
- Yonggang Chi
- College of Geography and Environmental SciencesZhejiang Normal UniversityJinhuaChina
- State Key Laboratory of Vegetation and Environmental ChangeInstitute of BotanyChinese Academy of SciencesBeijingChina
- State Key Laboratory of Resources and Environmental Information SystemInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
| | - Zhuwen Xu
- School of Ecology and EnvironmentInner Mongolia UniversityHohhotChina
| | - Lei Zhou
- College of Geography and Environmental SciencesZhejiang Normal UniversityJinhuaChina
- Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
| | - Qingpeng Yang
- Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyChinese Academy of SciencesShenyangChina
| | - Shuxia Zheng
- State Key Laboratory of Vegetation and Environmental ChangeInstitute of BotanyChinese Academy of SciencesBeijingChina
| | - Shao‐peng Li
- Zhejiang Tiantong Forest Ecosystem National Observation and Research StationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghaiChina
- Institute of Eco‐Chongming (IEC)ShanghaiChina
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22
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方 昭. Response of Grassland Community and Stoichiometry to Nitrogen and Phosphorus Addition on Micro-Topography in the Hilly Loess Plateau. INTERNATIONAL JOURNAL OF ECOLOGY 2019. [DOI: 10.12677/ije.2019.84038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Liu J, Cui Y, Li X, Wilsey BJ, Isbell F, Wan S, Wang L, Wang D. Reversal of nitrogen-induced species diversity declines mediated by change in dominant grass and litter. Oecologia 2018; 188:921-929. [PMID: 30143873 DOI: 10.1007/s00442-018-4252-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 08/20/2018] [Indexed: 10/28/2022]
Abstract
Atmospheric nitrogen (N) deposition reduces plant diversity. However, it often remains unclear how dominant species and litter accumulation feedbacks mediate N-induced plant diversity declines. We tested mechanisms of N-induced diversity change through dominant grasses and litter in a 7-year field experiment. Nitrogen addition reduced species richness, Shannon-Wiener diversity (H') and evenness from the second to the fourth year, however, surprisingly, increased them in the sixth and seventh year. The reversal in the response of diversity to N addition was explained by changes in grass dominance and standing litter accumulation. The diversity recovery during later years in fertilized plots was attributed to a decrease in the dominant grass and an increase in standing litter: standing litter reduced bud numbers of the dominant grass by decreasing light availability. The decreased light availability by standing litter reduced completion from the dominant species, which resulted in diversity increase. The negative feedback between dominant grasses and standing litter led to transient N-induced diversity loss in the short-term, but recovery of plant diversity in the long-term. Grassland management that affects litter accumulation, such as firing, grazing and mowing, can therefore, have substantial effects on the long-term response of plant diversity to N deposition.
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Affiliation(s)
- Jushan Liu
- Key Laboratory of Vegetation Ecology, School of Environment, Institute of Grassland Science, Northeast Normal University, Ministry of Education, Changchun, 130024, China
| | - Yao Cui
- Key Laboratory of Vegetation Ecology, School of Environment, Institute of Grassland Science, Northeast Normal University, Ministry of Education, Changchun, 130024, China
| | - Xiaofei Li
- Key Laboratory of Vegetation Ecology, School of Environment, Institute of Grassland Science, Northeast Normal University, Ministry of Education, Changchun, 130024, China
| | - Brian J Wilsey
- Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, 50011, USA
| | - Forest Isbell
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Shiqiang Wan
- Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Ling Wang
- Key Laboratory of Vegetation Ecology, School of Environment, Institute of Grassland Science, Northeast Normal University, Ministry of Education, Changchun, 130024, China
| | - Deli Wang
- Key Laboratory of Vegetation Ecology, School of Environment, Institute of Grassland Science, Northeast Normal University, Ministry of Education, Changchun, 130024, China.
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24
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Zhou X, Bowker MA, Tao Y, Wu L, Zhang Y. Chronic nitrogen addition induces a cascade of plant community responses with both seasonal and progressive dynamics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 626:99-108. [PMID: 29335179 DOI: 10.1016/j.scitotenv.2018.01.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 01/03/2018] [Accepted: 01/04/2018] [Indexed: 05/22/2023]
Abstract
Short-lived herbaceous plants provide a useful model to rapidly reveal how multiple generations of plants in natural plant communities of sensitive desert ecosystems will be affected by N deposition. We monitored dynamic responses of community structure, richness, evenness, density and biomass of herbaceous plants to experimental N addition (2:1 NH4+:NO3- added at 0, 0.5, 1, 3, 6 and 24gNm-2a-1) in three seasons in each of three years in the Gurbantunggut desert, a typical temperate desert of central Asia. We found clear rate-dependent and season-dependent effects of N deposition on each of these variables, in most cases becoming more obvious through time. N addition reduced plant richness, leading to a loss of about half of the species after three generations in the highest N application level. Evenness and density were relatively insensitive to all but the greatest levels of N addition for two generations, but negative effects emerged in the third generation. Biomass, both above and below ground, was non-linearly affected by N deposition. Low and intermediate levels of N deposition often increased biomass, whereas the highest level suppressed biomass. Stimulatory effects of intermediate N addition disappeared in the third generation. All of these responses are strongly interrelated in a cascade of changes. Notably, changes in biomass due to N deposition were mediated by declines in richness and evenness, and other changes in community structure, rather than solely being the direct outcome of release from limitation. The interrelationships between N deposition and the different plant community attributes change not only seasonally, but also progressively change through time. These temporal changes appear to be largely independent of interannual or seasonal climatic conditions.
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Affiliation(s)
- Xiaobing Zhou
- Xinjiang Institute of Ecology and Geography, Key Laboratory of Biogeography and Bioresources in Arid Land, Chinese Academy of Sciences, Urumqi 830011, China.
| | - Matthew A Bowker
- School of Forestry, Northern Arizona University, Flagstaff, AZ 86011, USA.
| | - Ye Tao
- Xinjiang Institute of Ecology and Geography, Key Laboratory of Biogeography and Bioresources in Arid Land, Chinese Academy of Sciences, Urumqi 830011, China
| | - Lin Wu
- Xinjiang Institute of Ecology and Geography, Key Laboratory of Biogeography and Bioresources in Arid Land, Chinese Academy of Sciences, Urumqi 830011, China
| | - Yuanming Zhang
- Xinjiang Institute of Ecology and Geography, Key Laboratory of Biogeography and Bioresources in Arid Land, Chinese Academy of Sciences, Urumqi 830011, China.
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25
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Wang X, Ma T, Wang X, Zhuang Y, Wang X, Ning H, Shi H, Yu R, Yan D, Huang H, Bai Y, Shan G, Zhang B, Song Q, Zhang Y, Zhang T, Jia D, Liu X, Kang Z, Yan W, Yang B, Bao X, Sun S, Zhang F, Yu W, Bai C, Wei T, Yang T, Ma T, Wu X, Liu J, Du H, Zhang L, Yan Y, Wang D. Prevalence of pollen-induced allergic rhinitis with high pollen exposure in grasslands of northern China. Allergy 2018; 73:1232-1243. [PMID: 29322523 PMCID: PMC6033040 DOI: 10.1111/all.13388] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2017] [Indexed: 12/13/2022]
Abstract
BACKGROUND The aim of this study was to investigate the prevalence of epidemiologic and physician-diagnosed pollen-induced AR (PiAR) in the grasslands of northern China and to study the impact of the intensity and time of pollen exposure on PiAR prevalence. METHODS A multistage, clustered and proportionately stratified random sampling with a field interviewer-administered survey study was performed together with skin prick tests (SPT) and measurements of the daily pollen count. RESULTS A total of 6043 subjects completed the study, with a proportion of 32.4% epidemiologic AR and 18.5% PiAR. The prevalence was higher in males than females (19.6% vs 17.4%, P = .024), but no difference between the two major residential and ethnic groups (Han and Mongolian) was observed. Subjects from urban areas showed higher prevalence of PiAR than rural areas (23.1% vs 14.0%, P < .001). Most PiAR patients were sensitized to two or more pollens (79.4%) with artemisia, chenopodium, and humulus scandens being the most common pollen types, which were similarly found as the top three sensitizing pollen allergens by SPT. There were significant regional differences in the prevalence of epidemiologic AR (from 18.6% to 52.9%) and PiAR (from 10.5% to 31.4%) among the six areas investigated. PiAR symptoms were positively associated with pollen counts, temperature, and precipitation (P < .05), but negatively with wind speed and pressure P < .05). CONCLUSION Pollen-induced AR (PiAR) prevalence in the investigated region is extremely high due to high seasonal pollen exposure, which was influenced by local environmental and climate conditions.
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Affiliation(s)
- X.‐Y. Wang
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - T.‐T. Ma
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - X.‐Y. Wang
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - Y. Zhuang
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - X.‐D. Wang
- Department of Otolaryngology Head and Neck SurgeryBeijing TongRen HospitalBeijing Key Laboratory of Nasal DiseasesBeijing Institute of OtolaryngologyCapital Medical UniversityBeijingChina
| | - H.‐Y. Ning
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - H.‐Y. Shi
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - R.‐L. Yu
- Department of AllergyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - D. Yan
- Department of PharmacyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - H.‐D. Huang
- Department of NephrologyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - Y.‐F. Bai
- State Key Laboratory of Vegetation and Environmental ChangeInstitute of BotanyChinese Academy of SciencesBeijingChina
| | - G.‐L. Shan
- Department of Epidemiology and StatisticsInstitute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic Medicine PekingUnion Medical CollegeBeijingChina
| | - B. Zhang
- Department of Epidemiology and StatisticsInstitute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic Medicine PekingUnion Medical CollegeBeijingChina
| | - Q.‐K. Song
- Department of Science and TechnologyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - Y.‐F. Zhang
- Tongliao HospitalTongliao, Inner MongoliaChina
| | - T.‐J. Zhang
- Jarud People's HospitalJarud Banner, Tongliao, Inner MongoliaChina
| | - D.‐Z. Jia
- Kailu People's HospitalKailu County, Tongliao, Inner MongoliaChina
| | - X.‐L. Liu
- Kailu People's HospitalKailu County, Tongliao, Inner MongoliaChina
| | - Z.‐X. Kang
- Erenhot Community Health Service CenterErenhot, Inner MongoliaChina
| | - W.‐J. Yan
- Duolun People's HospitalDuolun, Inner MongoliaChina
| | - B.‐T. Yang
- Xiwu People's HospitalXiwu BannerInner MongoliaChina
| | - X.‐Z. Bao
- Kailu People's HospitalKailu County, Tongliao, Inner MongoliaChina
| | - S.‐H. Sun
- Jarud People's HospitalJarud Banner, Tongliao, Inner MongoliaChina
| | - F.‐F. Zhang
- Tongliao HospitalTongliao, Inner MongoliaChina
| | - W.‐H. Yu
- Jarud People's HospitalJarud Banner, Tongliao, Inner MongoliaChina
| | - C.‐L. Bai
- Xilingol Mongolian HospitalXilinhot, Inner MongoliaChina
| | - T. Wei
- Xilingol Mongolian HospitalXilinhot, Inner MongoliaChina
| | - T. Yang
- Xilingol Mongolian HospitalXilinhot, Inner MongoliaChina
| | - T.‐Q. Ma
- Erenhot Community Health Service CenterErenhot, Inner MongoliaChina
| | - X.‐B. Wu
- Erenhot Community Health Service CenterErenhot, Inner MongoliaChina
| | - J.‐G. Liu
- Duolun People's HospitalDuolun, Inner MongoliaChina
| | - H. Du
- Duolun People's HospitalDuolun, Inner MongoliaChina
| | - L. Zhang
- Department of Otolaryngology Head and Neck SurgeryBeijing TongRen HospitalBeijing Key Laboratory of Nasal DiseasesBeijing Institute of OtolaryngologyCapital Medical UniversityBeijingChina
| | - Y. Yan
- Department of UrologyBeijing Shijitan HospitalCapital Medical UniversityBeijingChina
| | - D.‐Y. Wang
- Department of OtolaryngologyYong Loo Lin School of MedicineNational University of SingaporeSingaporeSingapore
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26
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Chen H, Ma L, Xin X, Liu J, Wang R. Plant community responses to increased precipitation and belowground litter addition: Evidence from a 5-year semiarid grassland experiment. Ecol Evol 2018; 8:4587-4597. [PMID: 29760899 PMCID: PMC5938451 DOI: 10.1002/ece3.4012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 01/29/2018] [Accepted: 02/25/2018] [Indexed: 11/12/2022] Open
Abstract
Global climate change is predicted to stimulate primary production and consequently increases litter inputs. Changing precipitation regimes together with enhanced litter inputs may affect plant community composition and structure, with consequent influence on diversity and ecosystem functioning. Responses of plant community to increased precipitation and belowground litter addition were examined lasting 5 years in a semiarid temperate grassland of northeastern China. Increased precipitation enhanced community species richness and abundance of annuals by 16.8% and 44%, but litter addition suppressed them by 25% and 54.5% after 5 years, respectively. During the study period, perennial rhizome grasses and forbs had consistent negative relationship under ambient plots, whereas positive relationship between the two functional groups was found under litter addition plots after 5 years. In addition, increased precipitation and litter addition showed significant interaction on community composition, because litter addition significantly increased biomass and abundance of rhizome grasses under increased precipitation plots but had no effect under ambient precipitation levels. Our findings emphasize the importance of water availability in modulating the responses of plants community to potentially enhanced litter inputs in the semiarid temperate grassland.
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Affiliation(s)
- Hongxia Chen
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany The Chinese Academy of Sciences Beijing China.,University of Chinese Academy of Sciences Beijing China
| | - Linna Ma
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany The Chinese Academy of Sciences Beijing China.,University of Chinese Academy of Sciences Beijing China
| | - Xiaoping Xin
- Institute of Agricultural Resources and Regional Planning Chinese Academy of Agriculture Sciences Beijing China
| | - Junyao Liu
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany The Chinese Academy of Sciences Beijing China.,University of Chinese Academy of Sciences Beijing China
| | - Renzhong Wang
- State Key Laboratory of Vegetation and Environmental Change Institute of Botany The Chinese Academy of Sciences Beijing China.,University of Chinese Academy of Sciences Beijing China
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27
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Huang J, Yu H, Liu J, Luo C, Sun Z, Ma K, Kang Y, Du Y. Phosphorus addition changes belowground biomass and C:N:P stoichiometry of two desert steppe plants under simulated N deposition. Sci Rep 2018; 8:3400. [PMID: 29467375 PMCID: PMC5821873 DOI: 10.1038/s41598-018-21565-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 02/06/2018] [Indexed: 11/30/2022] Open
Abstract
Many studies have reported that increasing atmospheric nitrogen (N) deposition broadens N:phosphorus (P) in both soils and plant leaves and potentially intensifies P limitation for plants. However, few studies have tested whether P addition alleviates N-induced P limitation for plant belowground growth. It is also less known how changed N:P in soils and leaves affect plant belowground stoichiometry, which is significant for maintaining key belowground ecological processes. We conducted a multi-level N:P supply experiment (varied P levels combined with constant N amount) for Glycyrrhiza uralensis (a N fixing species) and Pennisetum centrasiaticum (a grass) from a desert steppe in Northwest China during 2011–2013. Results showed that increasing P addition increased the belowground biomass and P concentrations of both species, resulting in the decreases in belowground carbon (C):P and N:P. These results indicate that P inputs alleviated N-induced P limitation and hence stimulated belowground growth. Belowground C:N:P stoichiometry of both species, especially P. centrasiaticum, tightly linked to soil and green leaf C:N:P stoichiometry. Thus, the decoupling of C:N:P ratios in both soils and leaves under a changing climate could directly alter plant belowground stoichiometry, which will in turn have important feedbacks to primary productivity and C sequestration.
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Affiliation(s)
- Juying Huang
- Institute of Environmental Engineering, Ningxia University, Yinchuan, 750021, China.,Ningxia (China-Arab) Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan, 750021, China
| | - Hailong Yu
- Ningxia (China-Arab) Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan, 750021, China. .,College of Resources and Environment, Ningxia University, Yinchuan, 750021, China.
| | - Jili Liu
- Institute of Environmental Engineering, Ningxia University, Yinchuan, 750021, China.,Ningxia (China-Arab) Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan, 750021, China
| | - Chengke Luo
- Institute of Environmental Engineering, Ningxia University, Yinchuan, 750021, China.,Ningxia (China-Arab) Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan, 750021, China
| | - Zhaojun Sun
- Institute of Environmental Engineering, Ningxia University, Yinchuan, 750021, China.,Ningxia (China-Arab) Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan, 750021, China.,College of Resources and Environment, Ningxia University, Yinchuan, 750021, China
| | - Kaibo Ma
- College of Resources and Environment, Ningxia University, Yinchuan, 750021, China
| | - Yangmei Kang
- College of Resources and Environment, Ningxia University, Yinchuan, 750021, China
| | - Yaxian Du
- College of Resources and Environment, Ningxia University, Yinchuan, 750021, China
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28
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Increased soil nutrition and decreased light intensity drive species loss after eight years grassland enclosures. Sci Rep 2017; 7:44525. [PMID: 28344355 PMCID: PMC5366805 DOI: 10.1038/srep44525] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 02/10/2017] [Indexed: 11/23/2022] Open
Abstract
Enclosures (fenced, grazing or clipping) within a certain period of years are the most common tools for restoration of degraded grasslands in temperate regions. Short-term enclosures can improve biodiversity and productivity by effectively relieving grazing pressure, while long-term enclosures can reduce species diversity. We therefore carried out a field experiment to investigate the specific causes of the reduced species diversity in Hulunbeier grassland of northern China. After eight years of enclosure, the significantly increased soil available nitrogen (AN) and available phosphorus (AvP) in enclosure community reduced nitrogen (N) limitation but most vegetation was still N limited. Many environmental factors led to decreased species richness, but increased soil AN and decreased light intensity at the community bottom were the most significant ones. Community density decreased independently of soil nutrition but significantly related to decreased species richness. Density of dominant canopy species increased, while dominant understory species decreased during assemblage-level thinning; therefore, the random-loss hypothesis was not supported. The dominant understory species responded to lower light availability by increasing their height, leaf area, and chlorophyll content. Moreover, our results were expected to provide some specific guidance for the restoration mode selection of degraded grasslands in northern China.
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29
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Chen Q, Hooper DU, Li H, Gong XY, Peng F, Wang H, Dittert K, Lin S. Effects of resource addition on recovery of production and plant functional composition in degraded semiarid grasslands. Oecologia 2017; 184:13-24. [PMID: 28243743 DOI: 10.1007/s00442-017-3834-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 02/02/2017] [Indexed: 11/26/2022]
Abstract
Degradation of semiarid ecosystems from overgrazing threatens a variety of ecosystem services. Rainfall and nitrogen commonly co-limit production in semiarid grassland ecosystems; however, few studies have reported how interactive effects of precipitation and nitrogen addition influence the recovery of grasslands degraded by overgrazing. We conducted a 6-year experiment manipulating precipitation (natural precipitation and simulated wet year precipitation) and nitrogen (0, 25 and 50 kg N ha-1) addition at two sites with different histories of livestock grazing (moderately and heavily grazed) in Inner Mongolian steppe. Our results suggest that recovery of plant community composition and recovery of production can be decoupled. Perennial grasses provide long-term stability of high-quality forage production in this system. Supplemental water combined with exclosures led, in the heavily grazed site, to the strongest recovery of perennial grasses, although widespread irrigation of rangeland is not a feasible management strategy in many semiarid and arid regions. N fertilization combined with exclosures, but without water addition, increased dominance of unpalatable annual species, which in turn retarded growth of perennial species and increased inter-annual variation in primary production at both sites. Alleviation of grazing pressure alone allowed recovery of desired perennial species via successional processes in the heavily grazed site. Our experiments suggest that recovery of primary production and desirable community composition are not necessarily correlated. The use of N fertilization for the management of overgrazed grassland needs careful and systematic evaluation, as it has potential to impede, rather than aid, recovery.
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Affiliation(s)
- Qing Chen
- College of Resource and Environmental Sciences, China Agricultural University, Beijing, 100193, People's Republic of China
- Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, People's Republic of China
| | - David U Hooper
- Department of Biology, Western Washington University, Bellingham, WA, 98225-9160, USA
| | - Hui Li
- College of Resource and Environmental Sciences, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Xiao Ying Gong
- College of Resource and Environmental Sciences, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Fei Peng
- College of Resource and Environmental Sciences, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Hong Wang
- College of Resource and Environmental Sciences, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Klaus Dittert
- Institute of Plant Nutrition and Crop Physiology, University of Goettingen, 37075, Goettingen, Germany
| | - Shan Lin
- College of Resource and Environmental Sciences, China Agricultural University, Beijing, 100193, People's Republic of China.
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30
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Yang Z, Zhang Q, Su F, Zhang C, Pu Z, Xia J, Wan S, Jiang L. Daytime warming lowers community temporal stability by reducing the abundance of dominant, stable species. GLOBAL CHANGE BIOLOGY 2017; 23:154-163. [PMID: 27275848 DOI: 10.1111/gcb.13391] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 05/01/2016] [Indexed: 05/27/2023]
Abstract
Daytime warming and nighttime warming have the potential to influence plant community structure and ecosystem functions. However, their impacts on ecological stability remain largely unexplored. We conducted an eight-year field experiment to compare the effects of daytime and nighttime warming on the temporal stability of a temperate steppe in northern China. Our results showed that the cover and stability of dominant species, stability of subordinate species, and compensatory dynamics among species strongly influenced community-level stability. However, daytime, but not nighttime, warming significantly reduced community temporal stability mainly through the reduction in the abundance of dominant, stable species. These findings demonstrate the differential effects of daytime and nighttime warming on community stability and emphasize the importance of understanding the changes of dominant species for accurately predicting community dynamics under climate warming.
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Affiliation(s)
- Zhongling Yang
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, 475004, China
- School of Biology, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Qian Zhang
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Fanglong Su
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Chunhui Zhang
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810008, China
| | - Zhichao Pu
- School of Biology, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Jianyang Xia
- Research Center for Global Change and Ecological Forecasting, East China Normal University, Shanghai, 200062, China
| | - Shiqiang Wan
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Lin Jiang
- School of Biology, Georgia Institute of Technology, Atlanta, GA, 30332, USA
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31
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Response of aboveground biomass and diversity to nitrogen addition - a five-year experiment in semi-arid grassland of Inner Mongolia, China. Sci Rep 2016; 6:31919. [PMID: 27573360 PMCID: PMC5004133 DOI: 10.1038/srep31919] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 07/28/2016] [Indexed: 11/24/2022] Open
Abstract
Understanding the response of the plant community to increasing nitrogen (N) deposition is helpful for improving pasture management in semi-arid areas. We implemented a 5-year N addition experiment in a Stipa krylovii steppe of Inner Mongolia, northern China. The aboveground biomass (AGB) and species richness were measured annually. Along with the N addition levels, the species richness declined significantly, and the species composition changed noticeably. However, the total AGB did not exhibit a noticeable increase. We found that compensatory effects of the AGB occurred not only between the grasses and the forbs but also among Gramineae species. The plant responses to N addition, from the community to species level, lessened in dry years compared to wet or normal years. The N addition intensified the reduction of community productivity in dry years. Our study indicated that the compensatory effects of the AGB among the species sustained the stability of grassland productivity. However, biodiversity loss resulting from increasing N deposition might lead the semi-arid grassland ecosystem to be unsustainable, especially in dry years.
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32
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Ulrich W, Soliveres S, Thomas AD, Dougill AJ, Maestre FT. Environmental correlates of species rank - abundance distributions in global drylands. PERSPECTIVES IN PLANT ECOLOGY, EVOLUTION AND SYSTEMATICS 2016; 20:56-64. [PMID: 27330404 PMCID: PMC4910862 DOI: 10.1016/j.ppees.2016.04.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Theoretical models predict lognormal species abundance distributions (SADs) in stable and productive environments, with log-series SADs in less stable, dispersal driven communities. We studied patterns of relative species abundances of perennial vascular plants in global dryland communities to: i) assess the influence of climatic and soil characteristics on the observed SADs, ii) infer how environmental variability influences relative abundances, and iii) evaluate how colonisation dynamics and environmental filters shape abundance distributions. We fitted lognormal and log-series SADs to 91 sites containing at least 15 species of perennial vascular plants. The dependence of species relative abundances on soil and climate variables was assessed using general linear models. Irrespective of habitat type and latitude, the majority of the SADs (70.3%) were best described by a lognormal distribution. Lognormal SADs were associated with low annual precipitation, higher aridity, high soil carbon content, and higher variability of climate variables and soil nitrate. Our results do not corroborate models predicting the prevalence of log-series SADs in dryland communities. As lognormal SADs were particularly associated with sites with drier conditions and a higher environmental variability, we reject models linking lognormality to environmental stability and high productivity conditions. Instead our results point to the prevalence of lognormal SADs in heterogeneous environments, allowing for more evenly distributed plant communities, or in stressful ecosystems, which are generally shaped by strong habitat filters and limited colonisation. This suggests that drylands may be resilient to environmental changes because the many species with intermediate relative abundances could take over ecosystem functioning if the environment becomes suboptimal for dominant species.
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Affiliation(s)
- Werner Ulrich
- Chair of Ecology and Biogeography, Nicolaus Copernicus University in Toruń Lwowska 1, 87-100 Toruń, Poland,
| | - Santiago Soliveres
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland,
| | - Andrew D Thomas
- Department of Geography and Earth Sciences, Aberystwyth University, SY23 3DB, UK,
| | - Andrew J Dougill
- School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK,
| | - Fernando T Maestre
- Área de Biodiversidad y Conservación, Biología y Geología, Física y Química Inorgánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Móstoles, Spain,
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33
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Yang Z, Jiang L, Su F, Zhang Q, Xia J, Wan S. Nighttime warming enhances drought resistance of plant communities in a temperate steppe. Sci Rep 2016; 6:23267. [PMID: 26987482 PMCID: PMC4796875 DOI: 10.1038/srep23267] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 03/03/2016] [Indexed: 11/23/2022] Open
Abstract
Drought events could have profound influence on plant community structure and ecosystem function, and have subsequent impacts on community stability, but we know little about how different climate warming scenarios affect community resistance and resilience to drought. Combining a daytime and nighttime warming experiment in the temperate steppe of north China with a natural drought event during the study period, we tested how daytime and nighttime warming influences drought resistance and resilience. Our results showed that the semi-arid steppe in north China was resistant to both daytime and nighttime warming, but vulnerable to drought. Nighttime warming, but not daytime warming, enhanced community resistance to drought via stimulating carbon sequestration, whereas neither daytime nor nighttime warming affected community resilience to drought. Large decline in plant community cover, primarily caused by the reduction in the cover of dominant and rare species rather than subordinate species during drought, did not preclude rapid ecosystem recovery. These findings suggest that nighttime warming may facilitate ecosystem sustainability and highlight the need to assess the effects of climate extremes on ecosystem functions at finer temporal resolutions than based on diurnal mean temperature.
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Affiliation(s)
- Zhongling Yang
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, Henan 475004, China
| | - Lin Jiang
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Fanglong Su
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, Henan 475004, China
| | - Qian Zhang
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, Henan 475004, China
| | - Jianyang Xia
- Tiantong National Station of Forest Ecosystem & School of Ecological and Environmental Science, East China Normal University, China
| | - Shiqiang Wan
- State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, Henan 475004, China
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34
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Tian Q, Liu N, Bai W, Li L, Chen J, Reich PB, Yu Q, Guo D, Smith MD, Knapp AK, Cheng W, Lu P, Gao Y, Yang A, Wang T, Li X, Wang Z, Ma Y, Han X, Zhang WH. A novel soil manganese mechanism drives plant species loss with increased nitrogen deposition in a temperate steppe. Ecology 2016; 97:65-74. [DOI: 10.1890/15-0917.1] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Qiuying Tian
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
- Research Network of Global Change Biology; Beijing Institutes of Life Science; Chinese Academy of Sciences; Beijing 100101 China
| | - Nana Liu
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Wenming Bai
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - Linghao Li
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - Jiquan Chen
- International Center for Ecology, Meteorology, and Environment (IceMe); Nanjing 210044 China
- CGCEO/Geography; Michigan State University; East Lansing Michigan 48823 USA
| | - Peter B. Reich
- Department of Forest Resources; University of Minnesota; St. Paul Minnesota 55108 USA
- Hawkesbury Institute for the Environment; University of Western Sydney; Penrith New South Wales 2753 Australia
| | - Qiang Yu
- State Key Laboratory of Forest and Soil Ecology; Institute of Applied Ecology; Chinese Academy of Sciences; Shenyang 110164 China
- Department of Biology and Graduate Degree Program in Ecology; Colorado State University; Fort Collins Colorado 80523 USA
| | - Dali Guo
- Key Laboratory of Ecosystem Network Observation and Modeling; Synthesis Research Center of Chinese Ecosystem Research Network; Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing 100101 China
| | - Melinda D. Smith
- Department of Biology and Graduate Degree Program in Ecology; Colorado State University; Fort Collins Colorado 80523 USA
| | - Alan K. Knapp
- Department of Biology and Graduate Degree Program in Ecology; Colorado State University; Fort Collins Colorado 80523 USA
| | - Weixin Cheng
- State Key Laboratory of Forest and Soil Ecology; Institute of Applied Ecology; Chinese Academy of Sciences; Shenyang 110164 China
- Environmental Studies; University of California; Santa Cruz California 95064 USA
| | - Peng Lu
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - Yan Gao
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - An Yang
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - Tianzuo Wang
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - Xin Li
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
| | - Zhengwen Wang
- State Key Laboratory of Forest and Soil Ecology; Institute of Applied Ecology; Chinese Academy of Sciences; Shenyang 110164 China
| | - Yibing Ma
- National Soil Fertility and Fertilizer Effects Long-term Monitoring Network; Institute of Agricultural Resources and Regional Planning; Chinese Academy of Agricultural Sciences; Beijing 100081 China
| | - Xingguo Han
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
- State Key Laboratory of Forest and Soil Ecology; Institute of Applied Ecology; Chinese Academy of Sciences; Shenyang 110164 China
| | - Wen-Hao Zhang
- State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
- Research Network of Global Change Biology; Beijing Institutes of Life Science; Chinese Academy of Sciences; Beijing 100101 China
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Zhou L, Wang S, Chi Y, Li Q, Huang K, Yu Q. Responses of photosynthetic parameters to drought in subtropical forest ecosystem of China. Sci Rep 2015; 5:18254. [PMID: 26666469 PMCID: PMC4678887 DOI: 10.1038/srep18254] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 11/16/2015] [Indexed: 11/08/2022] Open
Abstract
The mechanism underlying the effect of drought on the photosynthetic traits of leaves in forest ecosystems in subtropical regions is unclear. In this study, three limiting processes (stomatal, mesophyll and biochemical limitations) that control the photosynthetic capacity and three resource use efficiencies (intrinsic water use efficiency (iWUE), nitrogen use efficiency (NUE) and light use efficiency (LUE)), which were characterized as the interactions between photosynthesis and environmental resources, were estimated in two species (Schima superba and Pinus massoniana) under drought conditions. A quantitative limitation analysis demonstrated that the drought-induced limitation of photosynthesis in Schima superba was primarily due to stomatal limitation, whereas for Pinus massoniana, both stomatal and non-stomatal limitations generally exhibited similar magnitudes. Although the mesophyll limitation represented only 1% of the total limitation in Schima superba, it accounted for 24% of the total limitations for Pinus massoniana. Furthermore, a positive relationship between the LUE and NUE and a marginally negative relationship or trade-off between the NUE and iWUE were observed in the control plots. However, drought disrupted the relationships between the resource use efficiencies. Our findings may have important implications for reducing the uncertainties in model simulations and advancing the understanding of the interactions between ecosystem functions and climate change.
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Affiliation(s)
- Lei Zhou
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Shaoqiang Wang
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Yonggang Chi
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Qingkang Li
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Kun Huang
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Quanzhou Yu
- Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
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Yang A, Liu N, Tian Q, Bai W, Williams M, Wang Q, Li L, Zhang WH. Rhizosphere bacterial communities of dominant steppe plants shift in response to a gradient of simulated nitrogen deposition. Front Microbiol 2015; 6:789. [PMID: 26322024 PMCID: PMC4533001 DOI: 10.3389/fmicb.2015.00789] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Accepted: 07/20/2015] [Indexed: 12/23/2022] Open
Abstract
We evaluated effects of 9-year simulated nitrogen (N) deposition on microbial composition and diversity in the rhizosphere of two dominant temperate grassland species: grass Stipa krylovii and forb Artemisia frigida. Microbiomes in S. krylovii and A. frigida rhizosphere differed, but changed consistently along the N gradient. These changes were correlated to N-induced shifts to plant community. Hence, as plant biomass changed, so did bacterial rhizosphere communities, a result consistent with the role that N fertilizer has been shown to play in altering plant-microbial mutualisms. A total of 23 bacterial phyla were detected in the two rhizospheric soils by pyrosequencing, with Proteobacteria, Acidobacteria, and Bacteroidetes dominating the sequences of all samples. Bacterioidetes and Proteobacteria tended to increase, while Acidobacteria declined with increase in N addition rates. TM7 increased >5-fold in the high N addition rates, especially in S. krylovii rhizosphere. Nitrogen addition also decreased diversity of OTUs (operational taxonomic units), Shannon and Chao1 indices of rhizospheric microbes regardless of plant species. These results suggest that there were both similar but also specific changes in microbial communities of temperate steppes due to N deposition. These findings would contribute to our mechanistic understanding of impacts of N deposition on grassland ecosystem by linking changes in plant traits to their rhizospheric microbes-mediated processes.
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Affiliation(s)
- An Yang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China
| | - Nana Liu
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China ; University of Chinese Academy of Sciences Beijing, China
| | - Qiuying Tian
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China
| | - Wenming Bai
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China
| | - Mark Williams
- Department of Horticulture, Virginia Polytechnic Institute and State University Blacksburg, VA, USA
| | - Qibing Wang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China
| | - Linghao Li
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China
| | - Wen-Hao Zhang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing, China ; Research Network of Global Change Biology, Beijing Institutes of Life Science, Chinese Academy of Sciences Beijing, China
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37
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Yang G, Yang X, Zhang W, Wei Y, Ge G, Lu W, Sun J, Liu N, Kan H, Shen Y, Zhang Y. Arbuscular mycorrhizal fungi affect plant community structure under various nutrient conditions and stabilize the community productivity. OIKOS 2015. [DOI: 10.1111/oik.02351] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Gaowen Yang
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
- College of Agro-grassland Science, Nanjing Agricultural Univ.; CN-210095 Nanjing PR China
| | - Xin Yang
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Wenjun Zhang
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Yuqi Wei
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Ge Ge
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Wenjie Lu
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Juanjuan Sun
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Nan Liu
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Haiming Kan
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Yue Shen
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
| | - Yingjun Zhang
- Dept of Grassland Science; China Agricultural Univ.; CN-100193 Beijing PR China
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38
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Abundance- and functional-based mechanisms of plant diversity loss with fertilization in the presence and absence of herbivores. Oecologia 2015; 179:261-70. [DOI: 10.1007/s00442-015-3313-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2014] [Accepted: 04/03/2015] [Indexed: 11/25/2022]
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39
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Jiang L, Lan Z, Liu G, Kardol P. Interactive Effects of Nitrogen and Water Addition on Competitive Hierarchies Between Early- and Late- Successional Plant Species. POLISH JOURNAL OF ECOLOGY 2014. [DOI: 10.3161/104.062.0411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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40
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Wei C, Yu Q, Bai E, Lü X, Li Q, Xia J, Kardol P, Liang W, Wang Z, Han X. Nitrogen deposition weakens plant-microbe interactions in grassland ecosystems. GLOBAL CHANGE BIOLOGY 2013; 19:3688-97. [PMID: 23925948 DOI: 10.1111/gcb.12348] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 07/15/2013] [Accepted: 07/20/2013] [Indexed: 05/09/2023]
Abstract
Soil carbon (C) and nitrogen (N) stoichiometry is a main driver of ecosystem functioning. Global N enrichment has greatly changed soil C : N ratios, but how altered resource stoichiometry influences the complexity of direct and indirect interactions among plants, soils, and microbial communities has rarely been explored. Here, we investigated the responses of the plant-soil-microbe system to multi-level N additions and the role of dissolved organic carbon (DOC) and inorganic N stoichiometry in regulating microbial biomass in semiarid grassland in northern China. We documented a significant positive correlation between DOC and inorganic N across the N addition gradient, which contradicts the negative nonlinear correlation between nitrate accrual and DOC availability commonly observed in natural ecosystems. Using hierarchical structural equation modeling, we found that soil acidification resulting from N addition, rather than changes in the plant community, was most closely related to shifts in soil microbial community composition and decline of microbial respiration. These findings indicate a down-regulating effect of high N availability on plant-microbe interactions. That is, with the limiting factor for microbial biomass shifting from resource stoichiometry to soil acidity, N enrichment weakens the bottom-up control of soil microorganisms by plant-derived C sources. These results highlight the importance of integratively studying the plant-soil-microbe system in improving our understanding of ecosystem functioning under conditions of global N enrichment.
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Affiliation(s)
- Cunzheng Wei
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Beijing, 100049, China
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Sala OE, Gherardi LA, Reichmann L, Jobbágy E, Peters D. Legacies of precipitation fluctuations on primary production: theory and data synthesis. Philos Trans R Soc Lond B Biol Sci 2013; 367:3135-44. [PMID: 23045711 DOI: 10.1098/rstb.2011.0347] [Citation(s) in RCA: 260] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Variability of above-ground net primary production (ANPP) of arid to sub-humid ecosystems displays a closer association with precipitation when considered across space (based on multiyear averages for different locations) than through time (based on year-to-year change at single locations). Here, we propose a theory of controls of ANPP based on four hypotheses about legacies of wet and dry years that explains space versus time differences in ANPP-precipitation relationships. We tested the hypotheses using 16 long-term series of ANPP. We found that legacies revealed by the association of current- versus previous-year conditions through the temporal series occur across all ecosystem types from deserts to mesic grasslands. Therefore, previous-year precipitation and ANPP control a significant fraction of current-year production. We developed unified models for the controls of ANPP through space and time. The relative importance of current-versus previous-year precipitation changes along a gradient of mean annual precipitation with the importance of current-year PPT decreasing, whereas the importance of previous-year PPT remains constant as mean annual precipitation increases. Finally, our results suggest that ANPP will respond to climate-change-driven alterations in water availability and, more importantly, that the magnitude of the response will increase with time.
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Affiliation(s)
- Osvaldo E Sala
- School of Sustainability, Arizona State University, Tempe, AZ, USA.
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Maestre FT, Salguero-Gómez R, Quero JL. It is getting hotter in here: determining and projecting the impacts of global environmental change on drylands. Philos Trans R Soc Lond B Biol Sci 2013; 367:3062-75. [PMID: 23045705 DOI: 10.1098/rstb.2011.0323] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Drylands occupy large portions of the Earth, and are a key terrestrial biome from the socio-ecological point of view. In spite of their extent and importance, the impacts of global environmental change on them remain poorly understood. In this introduction, we review some of the main expected impacts of global change in drylands, quantify research efforts on the topic, and highlight how the articles included in this theme issue contribute to fill current gaps in our knowledge. Our literature analyses identify key under-studied areas that need more research (e.g. countries such as Mauritania, Mali, Burkina Faso, Chad and Somalia, and deserts such as the Thar, Kavir and Taklamakan), and indicate that most global change research carried out to date in drylands has been done on a unidisciplinary basis. The contributions included here use a wide array of organisms (from micro-organisms to humans), spatial scales (from local to global) and topics (from plant demography to poverty alleviation) to examine key issues to the socio-ecological impacts of global change in drylands. These papers highlight the complexities and difficulties associated with the prediction of such impacts. They also identify the increased use of long-term experiments and multidisciplinary approaches as priority areas for future dryland research. Major advances in our ability to predict and understand global change impacts on drylands can be achieved by explicitly considering how the responses of individuals, populations and communities will in turn affect ecosystem services. Future research should explore linkages between these responses and their effects on water and climate, as well as the provisioning of services for human development and well-being.
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Affiliation(s)
- Fernando T Maestre
- Área de Biodiversidad y Conservación, Departamento de Biología y Geología, ESCET, Universidad Rey Juan Carlos, 28933 Móstoles, Spain.
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