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《Chinese Journal of Atmospheric Sciences》 1993-01
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Sources of Methane in China : Rice Fields , Agricultural Waste Treatment, Cattle , Coal Mines , and Other Minor Sources

H . Schutz H . Renneuberg W . Seiler R. A. Rasmussen M. A. K. Khalil Wang Mingxing , Dai Aiguo , Huang Jun , Ren Lixin , Shen Renxing(Institute of Atmospheric Physics, Chinese Academy of Sciences , Beijing 100029)Schutz H ., Rennenberg H ., Seiler W .(Fraunhofer Institute for Atmospheric Environment Research , FRG)Rasmussen R . A ., Khalil M . A . K .(Oregon Graduate Center , USA)  
Continuous measurements of the methane flux from rice fields were carried out by using chamber technique . The results show that the methane flux from rice fields has a strong diurnal variation , and that the day-mean flux has a large seasonal variation . Based on the experiments, we estimate that the total emission of methane from rice fields in China is (17 ± 2) t/yr. Methane leakage from biogas pits is very little on the whole, with a range of 61 - 490 mg/hr/pit. The total emission from biogas pits in China may be of the order of 0.01 t/yr. Total emissions of methane from cattle in China are estimated to be 5.5 t/yr . Coal and oil mining may emit 6 t methane per year. Emissions from natural wetland in China are estimated to be about 2 t/yr . There is an important source of methane in China that has not been measured . Agricultural waste in China is often treated in cesspools, which are similar to the biogas pits . However, no methane is recovered from such cesspools . We estimate that the total flux of methane from such sources may be of the order of 5 t/yr. The total emissions of methane from sources in China are estimated to be about 35 ± 5 t/yr.
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