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| Effects of reclamation and cultivating rice on CH4-producing microorganisms in Chongming Dongtan Wetland, China |
| Received:August 18, 2019 |
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| KeyWord:reclamation;paddy field;CH4 production potential;H2/CO2 trophic methanogens |
| Author Name | Affiliation | E-mail | | ZHANG Xin-lei | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Shanxi Climate Center, Taiyuan 030006, China | | | SONG Yi-xuan | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHANG Jie | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Fang-yuan | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHANG Yao-hong | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | yhzhang@nuist.edu.cn | | JIA Zhong-jun | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Coastal wetlands are an important natural source of CH4 emission, which is strongly influenced by human activities. In this study, Chongming Dongtan Natural Wetland(bare, flat wetland and reed-vegetated wetland)in the estuary of Yangtze River was selected as the control, and CH4 production potential and the related microbial quantity and characteristics were investigated in the paddy field soils with different reclamation years(27, 51, 86 years). The results showed that the average rate of CH4 production in reclaimed paddy fields was 13.8 ng CH4·g-1·d-1, which was 3.3 times higher than that in natural wetlands and increased significantly with the increase in reclamation years. The average copy number of mcrA gene in the methanogens was 1.101×108~1.443×108 copies·g-1 in reclaimed paddy fields, which was an order of magnitude higher than that in bare, flat wetland and increased with the increase in reclamation years. The relative abundance of the methanogens(as a percentage of the whole archaea)was significantly lower in bare, flat wetland than in reed wetland and reclaimed paddy field, and the relative abundance in reclaimed paddy field increased significantly with the increase in reclamation years. More importantly, the relative abundance of H2/CO2 trophic methanogens increased in order of magnitude with the increase in reclamation years, whereas the relative abundance of methylamine trophic methanogens decreased in order of magnitude with the increase in reclamation years. In addition, the relative abundance of acetic acid trophic methanogens was in the same order of magnitude in the five sampling sites, and there was no significant difference among the three reclaimed paddy fields. The correlation analysis showed that the production rate of CH4 was positively correlated with the abundance of H2/CO2 trophic methanogens, but negatively correlated with methylamine trophic methanogens. Therefore, mellowing the soil using reclamation and cultivating rice promote the production of CH4 in coastal wetlands, and the significant increase in the number of H2/CO2 trophic methanogens is one of the main factors controlling the increased CH4 production rate. |
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