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| DOI：10.13522/j.cnki.ggps.2019232 |
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| Effects of Irrigation Amount on Emission of N2O and CO2 from Winter Wheat Field |
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XIONG Hao, ZHANG Baocheng, LI Jianzhu, ZHANG Xu, SHI Jianhua
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1.Tianjin University School of Civil Engineering, Tianjin 300350, China;2.Beijing Sino-water Keyuan Engineering Consulting Co., Ltd., Beijing 100053, China
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| Abstract: |
| 【Background】Global warming instigated by anthropological activities is the greatest environmental concern faced by the world, in which emission of N2O and CO2 from soil plays an important part.【Objective】The overarching objective of this paper is to understand the mechanisms underlying the emissions of N2O and CO2 from winter wheat field under different irrigations in attempts to provide guidance on improving agronomical management and consequently reducing greenhouse gas emissions.【Method】The experiment was conducted in a maize-wheat rotation field at Jinzhou city, Hebei province; it consists of six irrigation treatments: 89.96 mm (CK), 80.96 mm (T1), 71.97 mm (T2), 62.97 mm (T3), 53.98 mm (T4) and 44.98 mm (T5). In each treatment, we measured and analyzed the emission flux of N2O and CO2 using the static chamber-gas chromatography.【Result】①The emission of N2O and CO2 increased with irrigating water. Compared with CK, T1 to T5 reduced the cumulative emission of N2O by 24.99% (P=0.18), 10.89% (P=0.53), 39.14% (P=0.06), 48.99% (P<0.05) and 56.11% (P<0.05) respectively, while reduced the CO2 emission by 5.47%, 4.75%, 9.65%, 7.52% and 12.33%, respectively, although not at significant level (P>0.05). ②Correlation analysis showed that N2O emission was positively correlated with moisture in the 0~20 cm soil and temperature in the 0~5 cm soil. In contrast, CO2 emission was positively correlated with moisture in the 0~10 cm soil and temperature in the 0~5 cm soil, and negatively correlated with moisture in the 10~20 cm soil. ③Compared with CK, T1—T5 reduced the combined greenhouse effect of N2O and CO2 emission by 5.70%~19.08%, and T3 gave the highest wheat yield.【Conclusion】Irrigating 62.97 mm of water is optimal in terms of water use efficiency, crop yield and reducing greenhouse gases emission in the studied area. |
| Key words: irrigation amount; winter wheat; emission of N2O and CO2 |
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