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Drought-resistance rice variety with water-saving management reduces greenhouse gas emissions from paddies while maintaining rice yields

文献类型： 外文期刊

作者： Zhang, Xianxian 1 ; Zhou, Sheng 1 ; Bi, Junguo 2 ; Sun, Huifeng 1 ; Wang, Cong 1 ; Zhang, Jining 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, 1000 Jinqi Rd, Shanghai 201403, Peoples R China

2.Shanghai Agrobiol Gene Ctr, 2901 Beidi Rd, Shanghai 201106, Peoples R China

3.Shanghai Engn Res Ctr Low Carbon Agr SERCLA, 1000 Jinqi Rd, Shanghai 201403, Peoples R China

关键词： Agronomic practices; alternate wetting and drying; Dry cultivation; WDR; GHG mitigation

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： 2021 年 320 卷

页码：

收录情况： SCI

摘要： Rice paddies are a major anthropogenic source of greenhouse gas (GHG) emissions due to the flooding management. Water saving practices often reduce the GHG emissions from rice paddies, yet increase the risk of rice yields loss due to drought stress. Water-saving and drought-resistance rice (WDR) has high drought-tolerant, suggesting that WDR with water-saving management could reduce GHG emissions while maintaining rice yields. However, the effect of WDR on GHG emissions is still unclear. Therefore, we conducted a 2-yr field experiment to assess the effect of WDR on rice yields and GHG emissions under continuous flooding (F), alternate wetting and drying (AWD), and dry cultivation (D) conditions, using a WDR variety and a common variety. Compared to the common variety, the WDR did not affect the rice yields under F and AWD treatments, but increased rice yields by 24% under D treatment. The methane (CH4) emissions and nitrous oxide (N2O) emissions of the two rice varieties were similar. Compared to the F treatment, AWD treatment reduced CH4 emissions by 7%-64% and area-scaled global warming potential (GWP) by 9%-39% and D treatment reduced CH4 emissions by 70%-90% and area-scaled GWP by 65%-74%. The WDR with dry cultivation (D-WDR mode) had the lowest area- and yield-scaled GWP. Our findings indicate that it is possible to produce optimal rice yields with low GHG emissions in the D-WDR mode, and suggest that drought-resistance rice variety breeding may benefit climate change mitigation and adaptation efforts.

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