Acclimation of CH4 emissions from paddy soil to atmospheric CO2 enrichment in a growth chamber experiment

文献类型： 外文期刊

第一作者： Qian, Haoyu

作者： Qian, Haoyu;Liu, Yunlong;Zhang, Jun;Deng, Aixing;Zhang, Weijian;Jin, Yaguo;Zou, Jianwen;Chen, Jin;Huang, Shan;Pan, Genxing;Ding, Yanfeng;Jiang, Yu;van Groenigen, Kees Jan

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关键词： Elevated CO2; Methane emissions; Rice; Methanogens; Methanotrophs

期刊名称：CROP JOURNAL （ 影响因子：4.647； 五年影响因子：5.781 ）

ISSN： 2095-5421

年卷期： 2022 年 10 卷 1 期

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收录情况： SCI

摘要： Elevated levels of atmospheric CO2 (eCO(2)) promote rice growth and increase methane (CH4) emissions from rice paddies, because increased input of plant photosynthate to soil stimulates methanogenic archae. However, temporal trends in the effects of eCO(2) on rice growth and CH4 emissions are still unclear. To investigate changes in the effects of eCO(2) over time, we conducted a two-season pot experiment in a walk-in growth chamber. Positive effects of eCO(2) on rice leaf photosynthetic rate, biomass, and grain yield were similar between growing seasons. However, the effects of eCO(2) on CH4 emissions decreased over time. Elevated CO2 increased CH4 emissions by 48%-101% in the first growing season, but only by 28%-30% in the second growing season. We also identified the microbial process underlying the acclimation of CH4 emissions to atmospheric CO2 enrichment: eCO(2) stimulated the abundance of methanotrophs more strongly in soils that had been previously exposed to eCO(2) than in soils that had not been. These results emphasize the need for long-term eCO(2) experiments for accurate predictions of terrestrial feedbacks. (C) 2021 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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