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| Effects of phosphorus on methane emissions from rice fields and its possible mechanisms |
| Received:May 27, 2020 |
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| KeyWord:paddy field;phosphorus;methane emission;methane production;methanotroph |
| Author Name | Affiliation | E-mail | | HE Zhu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | XUE Li-hong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212001, China | njxuelihong@gmail.com | | YANG Lin-zhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XU Chen | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
1. Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Methane is the second most important greenhouse gas, and its potential for warming per molecule is 28~34 times higher than that of carbon dioxide. Rice fields, as an important source of methane emissions, emit approximately 12%~26% of the total global methane. Existing studies on methane emissions from rice fields are mainly focused on the effects of the addition of organic matter, fertilizer types, nitrogen, rice varieties, and soil types; however, little attention has been paid to phosphorus. In this study, published studies on phosphorus and methane emissions from paddy fields were reviewed. The data from literature were reanalyzed to summarize the influences of phosphorus on methane production and oxidation, and future research issues were discussed. It was found that the regulation of methane emissions from paddy fields by phosphorus was mainly affected by the planting system and other fertilization conditions. Most of the research data showed that phosphate fertilizer application reduced the methane emissions of single-season Indica rice, and the decrease rate depended on the soil nutrient status. The regulation of the production and oxidation of methane by phosphorus was mainly through affecting the availability of soil carbon by rice roots and their exudates, influencing soil phosphorus availability directly, and changing the abundance and community composition of soil methanogens and methanotrophs. |
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