Impacts of cropping practices on yield-scaled greenhouse gas emissions from rice fields in China: A meta-analysis

文献类型： 外文期刊

第一作者： Feng, Jinfei

作者： Feng, Jinfei;Chen, Changqing;Zhang, Yi;Zhang, Weijian;Feng, Jinfei;Song, Zhenwei;Deng, Aixing;Zheng, Chengyan;Zhang, Weijian

作者机构：

关键词： Food security;Global warming;CH4;N2O;Rice cropping

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

ISSN： 0167-8809

年卷期： 2013 年 164 卷

页码：

收录情况： SCI

摘要： Recently increasing studies suggest that a comprehensive assessment of cropping practices impacts on greenhouse gas (GHG) emissions at yield-scale will benefit cropping technique innovation and policy selection for higher-yield with less-emissions. In this paper, we conducted a meta-analysis to quantify the impacts of rice cropping practices on the global warming potential (GWP) of GHG emissions at yield-scale rather than area-scale in China. The results showed that the yield-scaled GWP of Chinese major rice cropping systems during rice growing season was in the order: double rice cropping system (1188.9 kg CO2 equiv.Mg-1) > rice-upland crop rotation system (777.0 kg CO2 equiv.Mg-1) > single rice cropping system (346.7 kg CO2 equiv.Mg-1). Nitrogen fertilization (50-300 kg N ha(-1)) significantly increased rice yield with slight increments in the GWP of CH4 and N2O emissions, resulting in significant reductions in the yield-scaled GWP. The greatest reduction occurred at the application rate of 150-200 kg N ha(-1) by 37% as compared to the non-fertilization control. For organic amendments, biogas residue application had no significant effect on the yield-scaled GWP, while manure application and straw recycling significantly increased the yield-scaled GWP by 54% and 154%, respectively. Intermittent irrigation significantly reduced yield-scaled GWP by 59% largely because of a significant reduction in CH4 emission and a significant increment in rice yield. No-tillage showed lower CH4 emission with similar rice yield in comparison with the conventional tillage, resulting in a reduction in yield-scaled GWP by 20%. These results indicate that there is a great potential to meet the new objective of higher-yield with less-GHG emissions through innovating rice cropping technique. More efforts should be paid on the field observations of GHG emissions during non-rice growing season, so as to perform a life-cycling assessment of GHG emissions from rice fields at yield scale under different cropping systems. (C) 2012 Elsevier B.V. All rights reserved.

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