Greenhouse Gas Emissions from Northeast China Rice Fields in Fallow Season

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Greenhouse Gas Emissions from Northeast China Rice Fields in Fallow Season

机译：淡季东北稻田温室气体排放

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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.

机译：在休耕季节（11月至3月）测量了中国东北稻田的CH4，N2O和CO2排放量，以研究冻融对排放量的影响。土壤中的CH4排放和大气中的CH4氧化都发生，但通量很小。在休耕季节，稻田只是大气中CH4的次要来源，占稻米生育期CH4排放量的1％左右。该场也是大气N2O的主要来源，其范围在40至77 mg m-2之间，占年度N2O排放的40％-50％。在休耕期的解冻期观察到最大的N2O通量。实验室温育测试表明，最大的N2O通量来自冻结在土壤中的N2O释放。耕作和稻草施用（覆盖在土壤表面或掺入土壤中）可在休耕季节刺激CH4和CO2排放，但仅秸秆施用会大幅刺激N2O排放。

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《土壤圈（英文版）》 |2007年第5期|630-638|共9页
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作者单位

Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,China;

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;

Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,China;

Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,China;

Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
CH4, CO2, freezing-thawing, N2O, rice field;

机译：CH4;CO2;冻融;N2O;稻田;
入库时间 2022-08-19 04:04:15

Greenhouse Gas Emissions from Northeast China Rice Fields in Fallow Season

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