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Qian H, Huang S, Chen J, Wang L, Hungate BA, van Kessel C, Zhang J, Deng A, Jiang Y, van Groenigen KJ, Zhang W. Lower-than-expected CH 4 emissions from rice paddies with rising CO 2 concentrations. Glob Chang Biol 2020; 26:2368-2376. [PMID: 32003939 DOI: 10.1111/gcb.14984] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 12/23/2019] [Indexed: 06/10/2023]
Abstract
Elevated atmospheric CO2 (eCO2 ) generally increases carbon input in rice paddy soils and stimulates the growth of methane-producing microorganisms. Therefore, eCO2 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 eCO2 is unclear. Here we show, by combining a series of experiments and meta-analyses, that whereas eCO2 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: eCO2 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 eCO2 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 eCO2 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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Affiliation(s)
- Haoyu Qian
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Shan Huang
- Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang, China
| | - Jin Chen
- Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Science, Nanchang, China
| | - Ling Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Bruce A Hungate
- Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, USA
| | - Chris van Kessel
- Department of Plant Sciences, University of California, Davis, CA, USA
| | - Jun Zhang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Aixing Deng
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Yu Jiang
- Jiangsu Collaborative Innovation Center for Modern Crop Production/Key Laboratory of Crop Physiology and Ecology in Southern China, Nanjing Agricultural University, Nanjing, China
- Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Kees Jan van Groenigen
- Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Weijian Zhang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Beijing, China
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