有机种植对盐碱土壤N2O、CO2排放通量的影响

以黑龙江省大庆市盐碱土壤为研究对象,探讨有机种植对盐碱土主要温室气体(N₂O和CO₂)排放的影响。采用IPCC(1992)的方法对试验结果进行计算及对比,结果表明,相较于常规种植,有机种植的温室气体(N₂O、CO₂)排放通量值较低,说明有机种植对盐碱土旱田的温室气体(N₂O、CO₂)有减排作用。在盐碱土上有机种植大豆、玉米,随着有机种植年限的增加,温室气体(N₂O、CO₂)的排放值略有变化,但差异不显著,且总体的增温潜势依然低于常规种植。而且,有机种植增加了试验区土壤微生物量碳、氮的含量。

Effect of organic farming on emissions of carbon dioxide and nitrogen oxide in alkali saline soil

In the present study, alkali saline soil in Daqing City, Heilongjiang Province was adopted as study objects to explore the effects of organic farming on greenhouse gases (N₂O, CO₂) emissions. By applying the method of IPCC (1992), it was shown that N₂O, CO₂ emissions in alkaline saline soil were reduced with organic farming compared with the conventional farming. With the prolonged time of organic cultivation of soybean and corn, greenhouse gas emissions were not significantly changed, and the overall warming potential was still lower than that of conventional farming. Besides, it was found that organic farming increased the content of soil microbial biomass carbon and nitrogen.