北京市主要农作模式的碳效益分析

本研究利用投入产出法的理论和方法,研究了北京地区主要农作模式的碳投入、产出及碳效益情况。结果表明:氮肥和电能在总碳投入中占较大比重,达70%～90%;蔬菜类作物的碳投入远大于非蔬菜类作物,设施蔬菜模式的碳投入分别比麦-玉两熟、春玉米一熟、春花生一熟模式高80.4%、92.0%、94.3%,其余模式间差异较小。春玉米易于田间施肥等管理,资源利用率较高,其碳效益最高,为4.59;春玉米一熟模式的碳效益分别比麦-玉两熟、春花生一熟、蔬菜模式高30.8%、8.31%、96.8%。因此,北京地区种植春玉米有利于减少农田碳排放。

Analysis on carbon efficiency of the main cropping systems in Beijing

This study determined the carbon input,carbon output and its efficiency for the main cropping systems in Beijing with the input-output method.The results showed that emissions from the fertilizers and electricity accounted for 70%~90% of the total emissions.Of which,the vegetable crops had higher carbon input than other crops,and the vegetables with facility system heightened its carbon input by 80.4%,92.0%,94.3% compared with wheat-maize system,spring maize monoculture system,peanut monoculture system,respectively.And there were no significant differences among these three traditional systems.As for the advanced field management and higher resource utilization rate,the spring maize was the most carbon efficienct crop with a carbon efficiency of 4.59;and the spring maize monoculture system heightened its carbon efficiency by 30.8%,8.31%,and 96.8% compared with wheat-maize pattern,peanut monoculture pattern,facilities vegetables pattern,respectively.The spring maize in Beijing could low carbon emissions from farming system.