Water regime-nitrogen fertilizer incorporation interaction: Field study on methane and nitrous oxide emissions from a rice agroecosystem in Harbin, China |
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| Authors: | Wenjun Dong Jia Guo Lijun Xu Zhifeng Song Jun Zhang Ao Tang Xijuan Zhang Chunxu Leng Youhong Liu Lianmin Wang Lizhi Wang Yang Yu Zhongliang Yang Yilei Yu Ying Meng and Yongcai Lai |
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| Institution: | 1.Heilongjiang Academy of Agricultural Sciences Postdoctoral Programme, Harbin 150086, China
2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
3.Northern Japonica Rice Molecular Breeding Joint Research Center, Chinese Academy of Sciences, Harbin 150086, China
4.Scientific Observing and Experimental Station of Crop Cultivation in Northeast China, Ministry of Agriculture, Harbin, 150086, China,5.Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
6.Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China,7.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China,8.Jilin Academy of Agricultural Sciences, Changchun, Jilin 130124, China,9.Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
3.Northern Japonica Rice Molecular Breeding Joint Research Center, Chinese Academy of Sciences, Harbin 150086, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China,10.Rice Institute of Wuchang, Heilongjiang Academy of Agricultural Sciences, Wuchang 150229, China,5.Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
6.Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China,2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China and 2.Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China |
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| Abstract: | Water regime and nitrogen (N) fertilizer are two important factors impacting greenhouse gases (GHG) emission from paddy field, whereas their effects have not been well studied in cold region. In this study, we conducted a two-year field experiment to study the impacts of water regime and N fertilizer on rice yields and GHG emissions in Harbin, China, a cold region located in high latitudes. Our results showed that intermittent irrigation significantly decreased methane (CH4) emission compared with continuous flooding, however, the decrement was far lower than the global average level. The N2O emissions were very small when flooded but peaked at the beginning of the disappearance of floodwater. The N fertilizer treatments increased CH4 emissions at low level (75kgN/ha). But both CH4 and N2O emissions were uninfluenced at the levels of 150kgN/ha and 225kgN/ha. Rice yields increased under intermittent irrigation and were highest at the level of 150kgN/ha. From our results, we recommended that the intermittent irrigation and 150kgN/ha as the ideal water regime-nitrogen fertilizer incorporation for this area to achieve low GHG emissions without impacting rice yields. |
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| Keywords: | Methane (CH4) Nitrous oxide (N2O) Rice ecosystem Cold region Global warming potential |
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