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| Effect of Chinese milk vetch incorporation on greenhouse gas emissions from early-rice direct-seeding paddy fields |
| Received:February 05, 2018 |
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| KeyWord:Chinese milk vetch;double-cropped rice;CH4;N2O;GWP |
| Author Name | Affiliation | E-mail | | NIE Jiang-wen | Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Hubei Key Laboratory of Waterlogging Disaster and Wetland Agriculture, Yangtze University, Jingzhou 434025, China | | | WANG You-juan | Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Hubei Key Laboratory of Waterlogging Disaster and Wetland Agriculture, Yangtze University, Jingzhou 434025, China | | | WU Bang-kui | Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Hubei Key Laboratory of Waterlogging Disaster and Wetland Agriculture, Yangtze University, Jingzhou 434025, China | | | LIU Zhang-yong | Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Hubei Key Laboratory of Waterlogging Disaster and Wetland Agriculture, Yangtze University, Jingzhou 434025, China | | | ZHU Bo | Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Hubei Key Laboratory of Waterlogging Disaster and Wetland Agriculture, Yangtze University, Jingzhou 434025, China | 1984zhubo@163.com |
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| Abstract: |
| With the aim of studying the effect of paddy fields incorporating Chinese milk vetch on CH4 and N2O emissions, a static closedchamber gas chromatography method was employed to measure CH4 and N2O emission fluxes, global warming potential (GWP), and greenhouse gas emissions intensity (GHGI) of southern double-cropped paddy fields in China under four different treatments. The treatments were fallow, double-cropped paddy field without nitrogen application (CK); fallow with 200 kg·hm-2 nitrogen application in the first and second rice growing seasons (N200); winter planting with Chinese milk vetch incorporation without nitrogen application (CMV); and winter planting with half Chinese milk vetch incorporation with 100 kg·hm-2 nitrogen application in the first and second rice growing seasons (CMV+N100). The results indicated that the CH4 emission peaks with the four treatments mainly occurred from the early rice transplanting stage to the tilling end stage and CMV+N100 (52.94 mg·m-2·h-1) and CMV (105.6 mg·m-2·h-1) had peak CH4 emission values, respectively, in the early rice and late rice stages. N2O emission peaks occurred in the early transplanting, tilling, and dry-wet alternation stages of the paddy fields, with the N200 N2O emission peaking both in the early and late rice stages, respectively, at 717.7 μg·m-2·h-1 and 1 065.57 μg·m -2·h-1. CMV+N100 increased the cumulative emissions of CH4, yet reduced N2O emissions, when compared with N200, and CH4 emissions during the early rice season were lower than those during the late rice season. At the same time, our results suggested that compared with CK, fertilization had no significant influence on the GWP of the paddy fields, and the contribution of CH4 to GWP was more than 90%. Compared with N200, CMV+N100 increased the GHGI of early rice but decreased the GHGI of late rice. However, no significant influence on the GHGI of double-cropped rice was observed. In conclusion, although Chinese milk vetch residue incorporation in paddy fields with nitrogen application increased CH4 emissions from the paddy fields, it reduced N2O emissions and the GHGI of the late rice season under direct seeding conditions. |
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