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Cardona GI, Escobar MC, Acosta-González A, Díaz-Ruíz N, Niño-García JP, Vasquez Y, Marrugo-Negrete J, Marqués S. Microbial diversity and abundance of Hg related genes from water, sediment and soil the Colombian amazon ecosystems impacted by artisanal and small-scale gold mining. CHEMOSPHERE 2024; 352:141348. [PMID: 38340998 DOI: 10.1016/j.chemosphere.2024.141348] [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: 11/29/2023] [Revised: 01/29/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024]
Abstract
The Amazon region abounds in precious mineral resources including gold, copper, iron, and coltan. Artisanal and small-scale gold mining (ASGM) poses a severe risk in this area due to considerable mercury release into the surrounding ecosystems. Nonetheless, the impact of mercury on both the overall microbiota and the microbial populations involved in mercury transformation is not well understood. In this study we evaluated microbial diversity in samples of soil, sediment and water potentially associated with mercury contamination in two localities (Taraira and Tarapacá) in the Colombian Amazon Forest. To this end, we characterized the bacterial community structure and mercury-related functions in samples from sites with a chronic history of mercury contamination which today have different levels of total mercury content. We also determined mercury bioavailability and mobility in the samples with the highest THg and MeHg levels (up to 43.34 and 0.049 mg kg-1, respectively, in Taraira). Our analysis of mercury speciation showed that the immobile form of mercury predominated in soils and sediments, probably rendering it unavailable to microorganisms. Despite its long-term presence, mercury did not appear to alter the microbial community structure or composition, which was primarily shaped by environmental and physicochemical factors. However, an increase in the relative abundance of merA genes was detected in polluted sediments from Taraira. Several Hg-responsive taxa in soil and sediments were detected in sites with high levels of THg, including members of the Proteobacteria, Acidobacteria, Actinobacteria, Firmicutes and Chloroflexi phyla. The results suggest that mercury contamination at the two locations sampled may select mercury-adapted bacteria carrying the merA gene that could be used in bioremediation processes for the region.
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Affiliation(s)
- Gladys Inés Cardona
- Instituto Amazónico de Investigaciones Científicas SINCHI. Laboratorio de Biotecnología y Recursos Genéticos, Bogotá, Colombia.
| | - Maria Camila Escobar
- Instituto Amazónico de Investigaciones Científicas SINCHI. Laboratorio de Biotecnología y Recursos Genéticos, Bogotá, Colombia; Escuela de Microbiología. Universidad de Antioquia, Medellín, Colombia
| | | | - Natalie Díaz-Ruíz
- Escuela de Microbiología. Universidad de Antioquia, Medellín, Colombia
| | | | - Yaneth Vasquez
- Chemistry Department, Universidad de Córdoba, Montería, Colombia
| | - José Marrugo-Negrete
- Convergence Science and Technology Cluster, Universidad Central, Bogotá, Colombia
| | - Silvia Marqués
- Department of Biotechnology and Environmental Protection. Estación Experimental Del Zaidín. Consejo Superior de Investigaciones Científicas, Granada, Spain
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Du C, Liu Y, Guo J, Zhang W, Xu R, Zhou B, Xiao X, Zhang Z, Gao Z, Zhang Y, Sun Z, Zhou X, Wang Z. Novel annual nitrogen management strategy improves crop yield and reduces greenhouse gas emissions in wheat-maize rotation systems under limited irrigation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 353:120236. [PMID: 38310800 DOI: 10.1016/j.jenvman.2024.120236] [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: 11/07/2023] [Revised: 01/12/2024] [Accepted: 01/24/2024] [Indexed: 02/06/2024]
Abstract
Excessive irrigation and nitrogen application have long seriously undermined agricultural sustainability in the North China Plain (NCP), leading to declining groundwater tables and intensified greenhouse gas (GHG) emissions. Developing low-input management practices that meet the growing food demand while reducing environmental costs is urgently needed. Here, we developed a novel nitrogen management strategy for a typical winter wheat-summer maize rotation system in the NCP under limited irrigation (wheat sowing irrigation only (W0) or sowing and jointing irrigation (W1)) and low nitrogen input (360 kg N ha-1, about 70 % of traditional annual nitrogen input). Novel nitrogen management strategy promoted efficient nitrogen fertilizer uptake and utilization by both crops via optimization of nitrogen fertilizer allocation between the two crops, i.e., increasing nitrogen inputs to wheat (from 180 to 240 kg N ha-1) while reducing nitrogen inputs to maize (from 180 to 120 kg N ha-1). Three-year field study demonstrated that integrated management practices combining novel nitrogen management strategy with limited irrigation increased annual yields and PFPN by 1.9-5.7 %, and reduced TGE by 55-68 kg CO2-eq ha-1 and GHGI by 2.2-10.3 %, without any additional cost. Our results provide agricultural operators and policymakers with practical and easy-to-scalable integrated management strategy, and offer key initiative to promote grain production in the NCP towards agriculture sustainable intensification with high productivity and efficiency, water conservation and emission reduction.
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Affiliation(s)
- Chenghang Du
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Ying Liu
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Jieru Guo
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Wanqing Zhang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Runlai Xu
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Bingjin Zhou
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Xuechen Xiao
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Zhen Zhang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Zhiqiang Gao
- Ministerial and Provincial Co-Innovation Centre for Endemic Crops Production with High-Quality and Efficiency in Loess Plateau, Taigu 030801, China; College of Agriculture, Shanxi Agricultural University, Taigu 030801, China
| | - Yinghua Zhang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Zhencai Sun
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
| | - Xiaonan Zhou
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
| | - Zhimin Wang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
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Sun H, Zhang F, Raza ST, Zhu Y, Ye T, Rong L, Chen Z. Three decades of shade trees improve soil organic carbon pools but not methane uptake in coffee systems. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 347:119166. [PMID: 37797515 DOI: 10.1016/j.jenvman.2023.119166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 09/03/2023] [Accepted: 09/27/2023] [Indexed: 10/07/2023]
Abstract
The rapid expansion of coffee plantations in tropical area at the cost of natural forest may suppress the methane (CH4) uptake and change the soil fertility. However, observations on soil CH4 uptake rates and the ecological consequence studies on coffee-based plantations are sparse. The objectives of this study were to characterize the dynamics of CH4 uptake among natural forest, coffee monoculture (CM), and coffee intercropping with shade tree (CI), and to evaluate the key drivers of soil CH4 uptake. Results showed that the conversion of forest into 25-year and 34-year CM plantations significantly reduced the soil organic carbon (SOC) content by 57% and 76%, respectively, whereas CI plantation profoundly increased the SOC by 20%-76% compared with CM plantation. Although soils of forest, CM and CI functioned exclusively as CH4 sinks, the CM and CI plantations significantly decreased the ambient CH4 uptake rates by 64%-83% due to soil moisture shift and soil nitrate availability by using chemical fertilizer. Interestingly, the potential CH4 uptake of CM and CI plantations did not decrease and in some treatments, was even higher than that of the natural forest. Potential CH4 uptake showed a negative correlation with soil pH and SOC content, but a positive correlation with soil available phosphorus (AP). Collectively, although the SOC and soil pH were increased through intercropping with shade trees for decades, the inhibition of atmospheric CH4 uptake was still difficult to alleviate.
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Affiliation(s)
- Hao Sun
- Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China, Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology and Centre for Invasion Biology, Institute of Biodiversity, School of Ecology and Environmental Science, Yunnan University, Kunming, 650500, China; Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, Yunnan University, Kunming, 650500, China; Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650500, China
| | - Fulan Zhang
- Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China, Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology and Centre for Invasion Biology, Institute of Biodiversity, School of Ecology and Environmental Science, Yunnan University, Kunming, 650500, China; Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, Yunnan University, Kunming, 650500, China
| | - Syed Turab Raza
- Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China, Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology and Centre for Invasion Biology, Institute of Biodiversity, School of Ecology and Environmental Science, Yunnan University, Kunming, 650500, China; Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, Yunnan University, Kunming, 650500, China; Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650500, China.
| | - Yingmo Zhu
- Faculty of Civil Aviation and Aeronautics, Kunming University of Science and Technology, Kunming, 650500, China
| | - Tao Ye
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China
| | - Li Rong
- Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650500, China
| | - Zhe Chen
- Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China, Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology and Centre for Invasion Biology, Institute of Biodiversity, School of Ecology and Environmental Science, Yunnan University, Kunming, 650500, China; Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, Yunnan University, Kunming, 650500, China.
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Bieluczyk W, Asselta FO, Navroski D, Gontijo JB, Venturini AM, Mendes LW, Simon CP, Camargo PBD, Tadini AM, Martin-Neto L, Bendassolli JA, Rodrigues RR, van der Putten WH, Tsai SM. Linking above and belowground carbon sequestration, soil organic matter properties, and soil health in Brazilian Atlantic Forest restoration. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 344:118573. [PMID: 37459811 DOI: 10.1016/j.jenvman.2023.118573] [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: 03/21/2023] [Revised: 06/27/2023] [Accepted: 07/02/2023] [Indexed: 09/17/2023]
Abstract
Forest restoration mitigates climate change by removing CO2 and storing C in terrestrial ecosystems. However, incomplete information on C storage in restored tropical forests often fails to capture the ecosystem's holistic C dynamics. This study provides an integrated assessment of C storage in above to belowground subsystems, its consequences for greenhouse gas (GHG) fluxes, and the quantity, quality, and origin of soil organic matter (SOM) in restored Atlantic forests in Brazil. Relations between SOM properties and soil health indicators were also explored. We examined two restorations using tree planting ('active restoration'): an 8-year-old forest with green manure and native trees planted in two rounds, and a 15-year-old forest with native-planted trees in one round without green manure. Restorations were compared to reformed pasture and primary forest sites. We measured C storage in soil layers (0-10, 10-20, and 20-30 cm), litter, and plants. GHG emissions were assessed using CH4 and CO2 fluxes. SOM quantity was evaluated using C and N, quality using humification index (HLIFS), and origin using δ13C and δ15N. Nine soil health indicators were interrelated with SOM attributes. The primary forest presented the highest C stocks (107.7 Mg C ha-1), followed by 15- and 8-year-old restorations and pasture with 69.8, 55.5, and 41.8 Mg C ha-1, respectively. Soil C stocks from restorations and pasture were 20% lower than primary forest. However, 8- and 15-year-old restorations stored 12.3 and 28.3 Mg ha-1 more aboveground C than pasture. The younger forest had δ13C and δ15N values of 2.1 and 1.7‰, respectively, lower than the 15-year-old forest, indicating more C derived from C3 plants and biological N fixation. Both restorations and pasture had at least 34% higher HLIFS in deeper soil layers (10-30 cm) than primary forest, indicating a lack of labile SOM. Native and 15-year-old forests exhibited higher soil methane influx (141.1 and 61.9 μg m-2 h-1). Forests outperformed pasture in most soil health indicators, with 69% of their variance explained by SOM properties. However, SOM quantity and quality regeneration in both restorations approached the pristine forest state only in the top 10 cm layer, while deeper soil retained agricultural degradation legacies. In conclusion, active restoration of the Atlantic Forest is a superior approach compared to pasture reform for GHG mitigation. Nonetheless, the development of restoration techniques to facilitate labile C input into deeper soil layers (>10 cm) is needed to further improve soil multifunctionality and long-term C storage.
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Affiliation(s)
- Wanderlei Bieluczyk
- University of São Paulo, Center for Nuclear Energy in Agriculture, Cell and Molecular Biology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil; University of São Paulo, Center for Nuclear Energy in Agriculture, Isotopic Ecology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Fernanda Ometto Asselta
- University of São Paulo, Center for Nuclear Energy in Agriculture, Cell and Molecular Biology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Deisi Navroski
- University of São Paulo, Center for Nuclear Energy in Agriculture, Cell and Molecular Biology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Júlia Brandão Gontijo
- University of São Paulo, Center for Nuclear Energy in Agriculture, Cell and Molecular Biology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Andressa Monteiro Venturini
- Princeton Institute for International and Regional Studies, Princeton University, Princeton, NJ, USA; Department of Biology, Stanford University, Stanford, CA, USA.
| | - Lucas William Mendes
- University of São Paulo, Center for Nuclear Energy in Agriculture, Cell and Molecular Biology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Carla Penha Simon
- University of São Paulo, Center for Nuclear Energy in Agriculture, Isotopic Ecology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Plínio Barbosa de Camargo
- University of São Paulo, Center for Nuclear Energy in Agriculture, Isotopic Ecology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Amanda Maria Tadini
- Brazilian Agricultural Research Corporation, Embrapa Instrumentation, 1452 XV de Novembro Street, São Carlos, SP, 13560-970, Brazil.
| | - Ladislau Martin-Neto
- Brazilian Agricultural Research Corporation, Embrapa Instrumentation, 1452 XV de Novembro Street, São Carlos, SP, 13560-970, Brazil.
| | - José Albertino Bendassolli
- University of São Paulo, Center for Nuclear Energy in Agriculture, Stable Isotope Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
| | - Ricardo Ribeiro Rodrigues
- University of São Paulo, "Luiz de Queiroz" College of Agriculture, Laboratory of Ecology and Forest Restoration, 11 Pádua Dias Avenue, Piracicaba, SP, 13418-900, Brazil.
| | - Wim H van der Putten
- Netherlands Institute of Ecology, NIOO-KNAW, Department of Terrestrial Ecology, 6708, PB, Wageningen, Netherlands; Laboratory of Nematology, Wageningen University, P.O. Box 8123, 6700, ES, Wageningen, the Netherlands.
| | - Siu Mui Tsai
- University of São Paulo, Center for Nuclear Energy in Agriculture, Cell and Molecular Biology Laboratory, 303 Centenário Avenue, Piracicaba, SP, 13416-000, Brazil.
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5
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Li F, Li H, Su H, Du W, Gao Z, Liu H, Liang H, Gao D. Effects of salinity on methane emissions and methanogenic archaeal communities in different habitat of saline-alkali wetlands. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:106378-106389. [PMID: 37728677 DOI: 10.1007/s11356-023-29922-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Accepted: 09/13/2023] [Indexed: 09/21/2023]
Abstract
The increase in temperature caused by global climate change has promoted the salinization of wetlands. Inland saline-alkaline wetlands have an environment of over-humidity and shallow water and are hot spots for CH4 emissions. However, there are few reports on the effect of salinity on CH4 emissions in inland saline-alkaline wetlands. This study conducted simulation experiments of increased salinity to investigate the impact of salinity, habitat, and their interactions on CH4 emissions, as well as to examine the response of methanogenic archaea to salinity. Overall, salinity inhibited CH4 emissions. But there were different responses in the three habitat soils. Salinity decreased the relative abundance of methanogenic archaea and changed the community structure. In addition, salinity changed soil pH and dissolved organic carbon (DOC) and ammonium (NH4+) concentrations, which were significantly correlated with methanogenic archaea. Our study showed that salinity changed the soil physicochemical properties and characteristics of the methanogenic archaeal community, affecting CH4 emissions.
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Affiliation(s)
- Feng Li
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
- Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Huiju Li
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
- Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Huihui Su
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
- Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Wei Du
- Heilongjiang Zhalong National Natural Reserve Administrative Bureau, Qiqihar, 161002, Heilongjiang, China
| | - Zhongyan Gao
- Heilongjiang Zhalong National Natural Reserve Administrative Bureau, Qiqihar, 161002, Heilongjiang, China
| | - Huajun Liu
- Heilongjiang Zhalong National Natural Reserve Administrative Bureau, Qiqihar, 161002, Heilongjiang, China
| | - Hong Liang
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
- Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Dawen Gao
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.
- Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.
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M Venturini A, B Gontijo J, A Mandro J, Berenguer E, Peay KG, M Tsai S, Bohannan BJM. Soil microbes under threat in the Amazon Rainforest. Trends Ecol Evol 2023:S0169-5347(23)00111-8. [PMID: 37270320 DOI: 10.1016/j.tree.2023.04.014] [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: 12/20/2022] [Revised: 04/11/2023] [Accepted: 04/26/2023] [Indexed: 06/05/2023]
Abstract
Soil microorganisms are sensitive indicators of land-use and climate change in the Amazon, revealing shifts in important processes such as greenhouse gas (GHG) production, but they have been overlooked in conservation and management initiatives. Integrating soil biodiversity with other disciplines while expanding sampling efforts and targeted microbial groups is crucially needed.
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Affiliation(s)
- Andressa M Venturini
- Princeton Institute for International and Regional Studies, Princeton University, Princeton, NJ 08544, USA; Department of Biology, Stanford University, Stanford, CA 94305, USA.
| | - Júlia B Gontijo
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP 13416-000, Brazil
| | - Jéssica A Mandro
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP 13416-000, Brazil
| | - Erika Berenguer
- Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK; Environmental Change Institute, University of Oxford, Oxford OX1 3QY, UK
| | - Kabir G Peay
- Department of Biology, Stanford University, Stanford, CA 94305, USA; Department of Earth System Science, Stanford University, Stanford, CA 94305, USA
| | - Siu M Tsai
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP 13416-000, Brazil
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7
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Gao W, Yang X, Zhang Y, Zhao T, Shi B, Yang T, Ma J, Xu W, Wu Y, Sun W. Suppression of methane uptake by precipitation pulses and long-term nitrogen addition in a semi-arid meadow steppe in northeast China. FRONTIERS IN PLANT SCIENCE 2023; 13:1071511. [PMID: 36726673 PMCID: PMC9884686 DOI: 10.3389/fpls.2022.1071511] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 12/30/2022] [Indexed: 06/18/2023]
Abstract
In the context of global change, the frequency of precipitation pulses is expected to decrease while nitrogen (N) addition is expected to increase, which will have a crucial effect on soil C cycling processes as well as methane (CH4) fluxes. The interactive effects of precipitation pulses and N addition on ecosystem CH4 fluxes, however, remain largely unknown in grassland. In this study, a series of precipitation pulses (0, 5, 10, 20, and 50 mm) and long-term N addition (0 and 10 g N m-2 yr-1, 10 years) was simulated to investigate their effects on CH4 fluxes in a semi-arid grassland. The results showed that large precipitation pulses (10 mm, 20 mm, and 50 mm) had a negative pulsing effect on CH4 fluxes and relatively decreased the peak CH4 fluxes by 203-362% compared with 0 mm precipitation pulse. The large precipitation pulses significantly inhibited CH4 absorption and decreased the cumulative CH4 fluxes by 68-88%, but small precipitation pulses (5 mm) did not significantly alter it. For the first time, we found that precipitation pulse size increased cumulative CH4 fluxes quadratically in both control and N addition treatments. The increased soil moisture caused by precipitation pulses inhibited CH4 absorption by suppressing CH4 uptake and promoting CH4 release. Nitrogen addition significantly decreased the absorption of CH4 by increasing NH4 +-N content and NO3 --N content and increased the production of CH4 by increasing aboveground biomass, ultimately suppressing CH4 uptake. Surprisingly, precipitation pulses and N addition did not interact to affect CH4 uptake because precipitation pulses and N addition had an offset effect on pH and affected CH4 fluxes through different pathways. In summary, precipitation pulses and N addition were able to suppress the absorption of CH4 from the atmosphere by soil, reducing the CH4 sink capacity of grassland ecosystems.
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Affiliation(s)
- Weifeng Gao
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
| | - Xu Yang
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
| | - Yicong Zhang
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
| | - Tianhang Zhao
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
| | - Baoku Shi
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
| | - Tianxue Yang
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Northeast Normal University, Changchun, Jilin, China
| | - Jianying Ma
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Wanling Xu
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
- College of Geography and Ocean Sciences, Yanbian University, Hunchun, China
| | - Yining Wu
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin, China
| | - Wei Sun
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology of the Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin, China
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Northeast Normal University, Changchun, Jilin, China
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8
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Metagenome-Assembled Genomes from Amazonian Soil Microbial Consortia. Microbiol Resour Announc 2022; 11:e0080422. [PMID: 36301097 PMCID: PMC9670897 DOI: 10.1128/mra.00804-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Here, we report 17 metagenome-assembled genomes (MAGs) recovered from microbial consortia of forest and pasture soils in the Brazilian Eastern Amazon. The bacterial MAGs have the potential to act in important ecological processes, including carbohydrate degradation and sulfur and nitrogen cycling.
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Venturini AM, Gontijo JB, Mandro JA, Paula FS, Yoshiura CA, da França AG, Tsai SM. Genome-resolved metagenomics reveals novel archaeal and bacterial genomes from Amazonian forest and pasture soils. Microb Genom 2022; 8. [PMID: 35894927 PMCID: PMC9455692 DOI: 10.1099/mgen.0.000853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Amazonian soil microbial communities are known to be affected by the forest-to-pasture conversion, but the identity and metabolic potential of most of their organisms remain poorly characterized. To contribute to the understanding of these communities, here we describe metagenome-assembled genomes (MAGs) recovered from 12 forest and pasture soil metagenomes of the Brazilian Eastern Amazon. We obtained 11 forest and 30 pasture MAGs (≥50% of completeness and ≤10 % of contamination), distributed among two archaeal and 11 bacterial phyla. The taxonomic classification results suggest that most MAGs may represent potential novel microbial taxa. MAGs selected for further evaluation included members of Acidobacteriota, Actinobacteriota, Desulfobacterota_B, Desulfobacterota_F, Dormibacterota, Eremiobacterota, Halobacteriota, Proteobacteria, and Thermoproteota, thus revealing their roles in carbohydrate degradation and mercury detoxification as well as in the sulphur, nitrogen, and methane cycles. A methane-producing Archaea of the genus Methanosarcina was almost exclusively recovered from pasture soils, which can be linked to a sink-to-source shift after the forest-to-pasture conversion. The novel MAGs constitute an important resource to help us unravel the yet-unknown microbial diversity in Amazonian soils and its functional potential and, consequently, the responses of these microorganisms to land-use change.
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Affiliation(s)
- Andressa M Venturini
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil.,Princeton Institute for International and Regional Studies, Princeton University, Princeton, NJ, USA
| | - Júlia B Gontijo
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
| | - Jéssica A Mandro
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
| | - Fabiana S Paula
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil.,Department of Biological Oceanography, Oceanographic Institute, University of São Paulo, São Paulo, SP, Brazil
| | - Caio A Yoshiura
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
| | - Aline G da França
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
| | - Siu M Tsai
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
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