Intermittent flooding lowers the impact of elevated atmospheric CO2 on CH4 emissions from rice paddies
文献类型： 外文期刊
作者： Qian, Haoyu 1 ; Chen, Jin 2 ; Zhu, Xiangchen 1 ; Wang, Ling 4 ; Liu, Yunlong 1 ; Zhang, Jun 5 ; Deng, Aixing 5 ; Song, Zhenwei 5 ; Ding, Yanfeng 1 ; Jiang, Yu 1 ; van Groenigen, Kees Jan 6 ; Zhang, Weijian 5 ;
作者机构： 1.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, Peoples R China
2.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Jiangxi, Peoples R China
3.Yichun Univ, Coll Life Sci & Environm Resources, Yichun 336000, Peoples R China
4.Jiangsu Univ Sci & Technol, Sch Biotechnol, Zhenjiang 212018, Jiangsu, Peoples R China
5.Chinese Acad Agr Sci, Inst Crop Sci, Minist Agr, Key Lab Crop Physiol & Ecol, Beijing 100081, Peoples R China
6.Univ Exeter, Coll Life & Environm Sci, Dept Geog, Exeter EX4 4RJ, Devon, England
关键词： Climate change; Greenhouse gas; Methanogens; Methanotrophs
期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.576； 五年影响因子：7.088 ）
ISSN： 0167-8809
年卷期： 2022 年 329 卷
页码：
收录情况： SCI
摘要： Atmospheric CO2 concentrations and water management practices both affect greenhouse gas (GHG) emissions from rice paddies, but interactive effects between these two factors are still unknown. Here, we show the first study to compare the impact of elevated atmospheric CO2 (eCO(2)) on GHG emissions under continuously flooded irrigation (CF) and under intermittently flooded (IF) conditions. Elevated CO2 stimulated CH4 emissions under CF by 50% in a field experiment and by 46% in a pot experiment, but it had no effect under IF in both experiments. Elevated CO2 had no effect on N2O emissions in either the field or pot experiment. Rice root biomass, aboveground biomass and grain yield increased with eCO(2), but were not affected by water management. Elevated CO2 only stimulated the abundance of methanogens under CF, suggesting that increased soil O-2 availability with IF limited methanogenic activity under eCO(2). Our findings suggest that estimates of CH4 emissions from global rice agriculture with eCO(2) need to account for recent changes in water management.
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