Lower-than-expected CH4 emissions from rice paddies with rising CO2 concentrations

文献类型： 外文期刊

第一作者： Qian, Haoyu

作者： Qian, Haoyu;Zhang, Jun;Deng, Aixing;Zhang, Weijian;Huang, Shan;Chen, Jin;Wang, Ling;Hungate, Bruce A.;van Kessel, Chris;Jiang, Yu;Jiang, Yu;van Groenigen, Kees Jan

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关键词： climate change; greenhouse gases; meta-analysis; rice agriculture; straw management

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：10.863； 五年影响因子：11.716 ）

ISSN： 1354-1013

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收录情况： SCI

摘要： Elevated atmospheric CO2 (eCO(2)) generally increases carbon input in rice paddy soils and stimulates the growth of methane-producing microorganisms. Therefore, eCO(2) is widely expected to increase methane (CH4) emissions from rice agriculture, a major source of anthropogenic CH4. Agricultural practices strongly affect CH4 emissions from rice paddies as well, but whether these practices modulate effects of eCO(2) is unclear. Here we show, by combining a series of experiments and meta-analyses, that whereas eCO(2) strongly increased CH4 emissions from paddies without straw incorporation, it tended to reduce CH4 emissions from paddy soils with straw incorporation. Our experiments also identified the microbial processes underlying these results: eCO(2) increased methane-consuming microorganisms more strongly in soils with straw incorporation than in soils without straw, with the opposite pattern for methane-producing microorganisms. Accounting for the interaction between CO2 and straw management, we estimate that eCO(2) increases global CH4 emissions from rice paddies by 3.7%, an order of magnitude lower than previous estimates. Our results suggest that the effect of eCO(2) on CH4 emissions from rice paddies is smaller than previously thought and underline the need for judicious agricultural management to curb future CH4 emissions.

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