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| Impacts of conservation tillage on greenhouse gas emissions from cropland in China: A review |
| Received:January 30, 2020 |
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| KeyWord:carbon dioxide emission;soil carbon sequestration;methane emission;straw retention;no-till;global warming potential;nitrous oxide emission |
| Author Name | Affiliation | E-mail | | ZHANG Guo | Institute of Karst Research, Guizhou Normal University, Guiyang 550001 China
State Engineering Technology Institute for Karst Desertfication Control, Guiyang 550001, China | | | WANG Xiao-ke | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | wangxk@rcees.ac.cn |
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| Abstract: |
| Crop production is one important source of greenhouse gas(GHG)in the world. Conservation tillage(CT), as effective practices to prevent soil erosion and dust storm, recently has been paid attention because of its contribution to soil GHG emission and carbon sequestration(SCS). We reviewed some newly published paper reporting the impacts of CT on emissions of CO2, CH4, N2O, SCS and their global warming potential(GWP)in China. The results showed:straw retention increased CO2 emission but the application of biochar made from straw did not. No-till generally decreased soil respiration. CH4 emission was increased by 10%~400% when straw returned in rice paddies, and become more when both the amount of straw returned increased and the period of straw retention lasted. Straw retention and no-till had complex effects on N2O emission depending on the amounts and C/N ratio of straw returned, retention types, climate and soil properties. Straw retention increased SCS, while no-till altered the vertical distribution of soil organic carbon and concentrated more carbon in the upper layer of soil. CT decreased net GHG emission and even converted some arable fields from carbon pool to sink if SCS was taken into account in GWP calculation. So the extension of CT is important for mitigation GHG emission from cropland. |
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