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| DOI：10.13522/j.cnki.ggps. 20190073 |
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| Response of Greenhouse Gas Emissions to Water-saving Irrigation in Croplands: A Review |
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LIU Jieyun, QIU Husen, ZHANG Wenzheng, ZONG Jie, LYU Mouchao
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1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;2. Key Laboratory of Water-saving Irrigation Engineering, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
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| Abstract: |
| 【Objective】Croplands emit greenhouse gases, and improving agronomical management to ameliorate emission has thus been touted as an alternative to mitigate climate change. It has received increased interest over the past decades. In this paper, we review how water-saving irrigations could alter gas emission from cropland. 【Method】 We analyzed previous research published in the literature with the focus on paddy field and upland. 【Result】Compared with flooding irrigation, water-saving irrigation increased CO2 emissions from paddy field by 20.83%~104.00% with an average of 48.40%; its impact on N2O emission varied from -41.30% to 3 078.41% with a mean 269.10%. In contrast, water-saving irrigation reduced CH4 emission by 14.19%~78.92% with an average of 51.66%. In terms of net global warming potential (GWP), water-saving irrigation reduced GWP of paddy field compared to flooding irrigation. In upland, drip irrigation changed the emission of CO2, N2O and CH4 by -31.19%~2.81%, -46.51%~52.56% and -150.00%~43.39%, respectively, compared to flooding irrigation. Since N2O is a more potent greenhouse gas, drip irrigation still reduces GWP compared to flooding irrigation.【Conclusion】Water-saving irrigation can not only save water but also mitigate greenhouse gas emissions from cropland. |
| Key words: water-saving irrigation; paddy field; upland; greenhouse gas emission; global warming potentia |
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