Comparison of manual and automatic methods for measurement of methane emission from rice paddy fields |
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| Authors: | Xunhua Zheng Mingxing Wang Yuesi Wang Renxing Shen Jing Li Heyer J Kogge M Laotu Li Jisheng Jin |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Fraunhofer Institute of Atmospheric Environmental Research, Garmisch-PD-82467, Germany,Wuxian Institute for Agriculture Sciences, Suzhnu 215128, P. R. China,Wuxian Institute for Agriculture Sciences, Suzhnu 215128, P. R. China |
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| Abstract: | 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 automatically measured data or reducing the manually measured ones. |
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| Keywords: | Methane emission Automatic method Manual method Rice paddy |
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