Study on fluxes of CH4 emission from paddy fields in Changchun area |
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| Authors: | Min-hua Yan Xue-hui Ma De-xuan Wang |
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| Institution: | (1) Changchun Institute of Geography, the Chinese Academy of Sciences, 130021 Changchun, P. R. China |
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| Abstract: | Little has been done in measurement and research of the flux of CH4 emission from paddy fields in Changchun area, Jilin Province, China before 1994. So the purpose of the study is to offer
available regional data of CH4 emission flux and to discuss the factors which affect CH4 emission from paddy fields. Experimental paddy fields are chosen using TM pictures respectively in Xinlicheng (43°49′N, 125°20′E)
of the Yitong River’s and in Wanchang (43°44′10″N, 125°53′11″E) of the Yinma River’s alluvial plain. The fluxes of CH4 emission from paddy fields are measured by the method of static chamber in Changchun area in 3 consecutive years. The research
results show that the peak of CH4 emission from paddy fields occurs during the booting stage. The mean fluxes of CH4 emission are 7.056 mg/m(2 · h) and 0.489 mg/(m2 · h) in the paddy fields of flood and discontinuous irrigation respectively. The contrastive study holds that climate condition,
the way of water management and fertilizer variation have significant influence on fluxes of CH4 emission from paddy fields. The difference of climatic conditions causes the interannual change of the flux of CH4 emission from paddy fields. In general, the flux of CH4 emission from paddy fields of flood irrigation is greater than that from paddy fields of discontinuous irrigation. To change
the way of water management perhaps in an available way to reduce CH4 emission flux from paddy fields.
Foundation item: Under the auspices of Jilin Commttee of Science and Technology (grant 963416 - 1), and Changchun Jingyuetan
Remote Sensing Test Site of the Chinese Academy of Sciences (grant 9504).
Biography: YAN Min-hua (1964 -), female, a native of Liaoning Province, master, associate professor. Her research interests
include climate change, greenhouse gases and wetland climate. |
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| Keywords: | flux of CH4 emission paddy field Changchun area influence factors |
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