| How to control the greenhouse gas emission in different farming management systems has become one of the most important problems for human beings,because the greenhouse have been recognized as one of the main factors contributing to global climate change,and agroecosystems are a major source of anthropogenic greenhouse gas emissions.Currently, limited information is available regarding the effects of different farmland management practices on fluxes of methane (CH4) from the fields. In this study diurnal and seasonal variations of CH4fluxes from fields under different farming practices,i.e. nowadays commonly used double furrows with plastic-mulching(DRM), tradition one ridge fertilize with none plastic film(M01) and one ridge fertilize with plastic film(M1N1), one ridge no fertilizer with plastic film (M1N0), one ridge no fertilize with none plastic film (MONO) and bare filed (B). This study was conducted in a corn field in Lanzhou,Northwestern China.Results show that the methane flux has obvious circadian and seasonal varation.The biggest fluctuation occurred at15:00; During the whole growing season,the absorb of CH4from air was increase about50days after sow and later decreased then keep steady,it has a big increase about one week after harvest.The fluxes of methane has no direct relations with the temperature and the SWC of the soil,it is not be controlled by single—factor but a combined effect of many environment factors. |
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