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| DOI：10.13522/j.cnki.ggps.20180099 |
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| Effects of Different Irrigations on Carbon Emission, Water Consumption and Yield of Paddy Field in Cold Regions |
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ZHANG Zhongming, WANG Zhongbo, ZHANG Zhongxue, WANG Xinliang
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1. School of Water Conservancy ＆ Civil Engineering, Northeast Agricultural University, Harbin 150030, China；2. Key Laboratory of Effective Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin 150030, China
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| Abstract: |
| 【Objective】 Soil water modulates all soil biochemical processes and plant growth. The objective of this paper is to investigate how different irrigations affect carbon emission, water consumption and the ultimate yield of paddy field in cold regions.【Method】 Field experiments were conducted considering five irrigation methods: controlled irrigation (C), thin-shallow-wet-sunny irrigation (T), leaf-age mode irrigation (B), shallow-wet irrigation (I), alternate wet and dry irrigation (D), and the conventional irrigation used by local farmers (CK). During the growth season of the rice under each irrigation, the emissive fluxes of CH4 and CO2 from the paddy field were measured using the static trap-gas chromatography, in addition to water consumption and ultimate yield of the rice. 【Result】 In terms of saving water and reducing greenhouse emissions, The Treatment C appeared to be most efficient, saving water by 1 794.3~2 012.3 m3/hm2 and increasing temperature potential by 10 654.13 kg/hm2. But its associated yield was low, 8 822.59 kg/hm2 only. In contrast, the Treatment I achieved a yield of 9 611.27 kg/hm2, but at prices of increasing the temperature potential to 12 128 kg/hm2. Taking all aspects into consideration, the alternate dry and wet irrigation appeared to be most efficient for reducing emission and saving water, without scarifying yield (9 077.99 kg/hm2); it also gave a temperature potential of 10 700.29 kg/hm2, which was 1 449.2~1 618.5 m3/hm2 lower than that in CK. 【Conclusion】 Our experimental results showed that in all irrigation methods we examined, alternate dry-wet irrigation is most suitable for reducing greenhouse gas emission and saving water while in the meantime maintaining a good yield. |
| Key words: rice; water-saving irrigation; yield; methane; carbon dioxide |
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