| 中国东北休闲期稻田温室气体排放 |
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| 作者姓名： | LIANG Wei SHI Yi ZHANG Hu YUE Jin HUANG Guo-Hong |
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| 作者单位： | [1]Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 （China） [2]Graduate School of the Chinese Academy of Sciences, Beijing 10005g （China） [3]College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070 （China） |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | CH4, N2O and CO2 emissions from northeast Chinese rice fields were measured in the fallow season （November to March） to investigate the effects of freezing-thawing on the emissions. Both CH4 emission from and atmospheric CH4 oxidation by the soil occurred, but the flux was small. During the fallow season, rice fields acted as a minor source of atmospheric CH4, which accounted for about 1% of the CH4 emission during the rice growing period. The field was also a substantial source of atmospheric N20, which ranged between 40 to 77 mg m-2 and eu=counted for 40%-50% of the annual N20 emission. The largest N20 flux was observed in the thawing period during the fallow season. Laboratory incubation tests showed that the largest N20 flux came from the release of N20 trapped in frozen soil. Tillage and rice straw application （either mulched on the soil surface or incorporated in the soil） stimulated the CH4 and CO2 emissions during the fallow season, but only straw application stimulated N2O emission substantially.
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| 关 键 词： | 中国 东北地区 休耕季节 水稻田 温室气体 |
| 收稿时间： | 16 January 2007 |
| 修稿时间： | 2007-01-162007-04-18 |
Greenhouse gas emissions from northeast China rice fields in fallow season |
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| LIANG Wei,SHI Yi,ZHANG Hu,YUE Jin,HUANG Guo-Hong.Greenhouse gas emissions from northeast China rice fields in fallow season[J].Pedosphere,2007,17(5):630-638. |
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| Authors: | LIANG Wei SHI Yi ZHANG Hu YUE Jin and HUANG Guo-Hong |
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| Institution: | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). E-mail: liangwei@mail.hzau.edu.cn;Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China);College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070 (China);Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). E-mail: liangwei@mail.hzau.edu.cn;Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). E-mail: liangwei@mail.hzau.edu.cn;Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). E-mail: liangwei@mail.hzau.edu.cn;Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). E-mail: liangwei@mail.hzau.edu.cn |
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| Abstract: | CH4, N2O and CO2 emissions from northeast Chinese rice fields were measured in the fallow season (November to March) to investigate the effects of freezing-thawing on the emissions. Both CH4 emission from and atmospheric CH4oxidation by the soil occurred, but the flux was small. During the fallow season, rice fields acted as a minor source of atmospheric CH4, which accounted for about 1% of the CH4 emission during the rice growing period. The field was also a substantial source of atmospheric N2O, which ranged between 40 to 77 mg m-2 and accounted for 40%-50% of the annual N2O emission. The largest N2O flux was observed in the thawing period during the fallow season. Laboratory incubation tests showed that the largest N2O flux came from the release of N2O trapped in frozen soil. Tillage and rice straw application (either mulched on the soil surface or incorporated in the soil) stimulated the CH4 and CO2 emissions during the fallow season, but only straw application stimulated N2O emission substantially. |
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| Keywords: | CH4 CO2 freezing-thawing N2O rice field |
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