Higher yields and lower methane emissions with new rice cultivars

文献类型： 外文期刊

第一作者： Hu, Shuijin

作者： Hu, Shuijin;Yan, Xiaojun;Wang, Lili;Zhang, Yi;Zhang, Weijian;Jiang, Yu;Zhang, Jun;Song, Zhenwei;Zheng, Chengyan;Deng, Aixing;Zhang, Weijian;van Groenigen, Kees Jan;van Groenigen, Kees Jan;van Kessel, Chris;Linquist, Bruce A.;Huang, Shan;Hungate, Bruce A.;Hu, Shuijin;Wu, Lianhai;Chen, Jin;Hang, Xiaoning;Horwath, William R.;Ye, Rongzhong

作者机构：

关键词： meta-analysis;methanogenesis;methanotrophy;roots;soil carbon

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：10.8； 五年影响因子：13.0 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Breeding high-yielding rice cultivars through increasing biomass is a key strategy to meet rising global food demands. Yet, increasing rice growth can stimulate methane (CH4) emissions, exacerbating global climate change, as rice cultivation is a major source of this powerful greenhouse gas. Here, we show in a series of experiments that high-yielding rice cultivars actually reduce CH4 emissions from typical paddy soils. Averaged across 33 rice cultivars, a biomass increase of 10% resulted in a 10.3% decrease in CH4 emissions in a soil with a high carbon (C) content. Compared to a low-yielding cultivar, a high-yielding cultivar significantly increased root porosity and the abundance of methane-consuming microorganisms, suggesting that the larger and more porous root systems of high-yielding cultivars facilitated CH4 oxidation by promoting O-2 transport to soils. Our results were further supported by a meta-analysis, showing that high-yielding rice cultivars strongly decrease CH4 emissions from paddy soils with high organic C contents. Based on our results, increasing rice biomass by 10% could reduce annual CH4 emissions from Chinese rice agriculture by 7.1%. Our findings suggest that modern rice breeding strategies for high-yielding cultivars can substantially mitigate paddy CH4 emission in China and other rice growing regions.

分类号： S9

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