Abstract
Effects of current four cropping systems, including paddy-paddy, paddy-upland, upland-paddy, and upland-upland on emissions of greenhouse gases (CO2, CH4, N2O) from agricultural soils in northern Taiwan were examined by a closed chamber method. The results showed that the total emissions of the three greenhouse gases (expressed as total CO2 equivalents) for the four cropping systems (paddy-paddy, paddy-upland, upland-paddy, upland-upland) were 20,707, 8,486, 13,324, and 7,399 kg C/ha/y, respectively. The mitigation potential of total greenhouse gases emissions could range from 1,087 to 13,308 kg C/ha/y, with a mean value of 7,460 kg C/ha/y. The results of forward stepwise regression analysis were also presented to examine the relationships among the emissions of the greenhouse gases and the environmental factors. The results obtained in this study could be used for the references of the mitigation of greenhouse gases emissions from agricultural soils.
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