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Comparison of manual and automatic methods for measurement of methane emission from rice paddy fields 总被引:29,自引:0,他引:29
Zheng Xunhu Wang Mingxing Wang Yuesi Shen Renxing Li Jing J. Heyer M. Kogge Li Laotu Jin Jisheng 《大气科学进展》1998,15(4):569-579
The methane emission flux from rice paddies was simultaneously measured with automatic and manual methods in the suburban of Suzhou. Both methods were based on the static chamber/ GC-FID techniques. Detail analysis of the experimental results indicates: a) The data of methane emission measured with the automatic method is reliable. b) About 11 or 19 o’clock of local time is recommended as the optimum sampling time for the manual spot measurement of methane emission from rice paddies. The methane emission fluxes measured by manual sampling at local time other than the optimum time have to be corrected. The correction coefficient may be determined by automatic and continuous measurement. c) In order to get a more accurate result, an empirical correction factor, such as 18%, is recommended to correct the seasonally total amount of measured methane emission by enlarging the au-tomatically measured data or reducing the manually measured ones. 相似文献
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太湖流域单季稻的甲烷排放研究 总被引:17,自引:1,他引:16
根据1994~1996年太湖流域单季稻的CH4排放的观测资料,分析了该地区稻田CH4排放的日变化的一些统计特征,对排放的季节变化和年际变化及相关因子对排放的影响进行了分析和研究。结果表明:太湖地区单季稻的CH4排放的特征值为0.07~0.11 g/(m2·d),而且存在巨大的年际变化,其中1995年的排放是1994年和1996年的5~7倍。与NH4HCO3相比,施用尿素使甲烷的排放增加10%~70%。晒田使CH4的排放减少,土壤的扰动则使CH4的排放增加。文中对CH4的排放与水稻的生长的关系及温度的变化对排放的影响也进行了讨论。 相似文献
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