文献类型： 外文期刊

作者： Zhang, Yi ¹ ; Jiang, Yu ² ; Tai, Amos P. K. ³ ; Feng, Jinfei ⁵ ; Li, Zhijie ⁶ ; Zhu, Xiangcheng ⁷ ; Chen, Jin ⁸ ; Zhang, ¹ ;

作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Jiangsu Collaborat Innovat Ctr Modern Crop Prod, Natl Engn & Technol Ctr Informat Agr, Key Lab Crop Physiol & Ecol Southern China, Nanjing 210095, Jiangsu, Peoples R China

3.Chinese Univ Hong Kong, State Key Lab Agrobiotechnol, Earth Syst Sci Programme, Hong Kong, Peoples R China

4.Chinese Univ Hong Kong, Inst Environm Energy & Sustainabil, Hong Kong, Peoples R China

5.China Natl Rice Res Inst, Hangzhou 310006, Zhejiang, Peoples R China

6.Aijin Agr Sci & Technol Serv Co Ltd, Nanjing 211515, Jiangsu, Peoples R China

7.Yichun Univ, Coll Life Sci & Environm Resources, Dept Agron, Yichun 336000, Jiangxi, Peoples R China

8.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Jiangxi, Peoples R China

9.Chinese Acad Agr Sci, Inst Crop Sci, Minist Agr, Beijing 100081, Peoples R China

10.Ohio State Univ, Sch Environm & Nat Resources, Columbus, OH 43210 USA

关键词： food security; climate change; greenhouse gas mitigation; agronomic practice; rice production

期刊名称：ENVIRONMENTAL RESEARCH LETTERS （ 影响因子：6.793； 五年影响因子：7.801 ）

ISSN： 1748-9326

年卷期： 2019 年 14 卷 11 期

页码：

收录情况： SCI

摘要： China?s rice agriculture, a primary source of greenhouse gases (GHGs), has experienced great changes in the last five decades due to changes in dominant varieties and farming practices. However, the impacts of these changes on GHG emissions have not been comprehensively assessed. While most earlier studies focused on the GHG emissions per unit area, recent research indicated that the yield-scaled impact may better reflect the reality. Through integrating the results from a meta-analysis, two multi-site field experiments and an expert survey, we quantify the integrated impacts of different practices on both area- and yield-scaled GHG emissions in China. Results from the expert survey showed that rice planting area has shifted northwards, and alternate water-saving (WS) irrigation has been applied in nearly 78% of Chinese rice paddy areas in both the rice nursery stage and post-transplanting period over the past five decades. The changes of these practices and replacement of new rice varieties have increased China?s rice yield by 131%. During the same period, cropping system adjustment, variety replacement, and implementation of WS irrigation have reduced total GHG emissions by 7%, 31%, and 42%, respectively. Also, the major decrease in GWP occurred prior to the 2000s, and the decreasing trend continued in the post-2000s period but at a slower rate. Our results have some limitations as these estimates ignore a number of important variations and interactions among management factors as well as climatic and edaphic conditions. Still, our findings illustrate that it is possible to enhance rice productivity at reduced environmental costs through screening for low emission varieties and agronomic practices. Future innovations should ensure that rice farming progressively adapts to climate change, while continuing to reduce GHG emissions.