土壤酸化对温室气体排放影响的培育实验研究

The incubation experiment studies on the influence of soil acidification on greenhouse gases emission

利用不同pH值的模拟酸雨(SAR)淋洗处理42个月获得具有不同累积酸化程度土壤,对其进行室内培养并研究了土壤温室气体CO2、CH4和N2O的排放特征.结果表明,一定的酸化累积促进CO2排放,而累积到某值时(如pH3.05的SAR淋洗42个月)又抑制CO2的排放;而CH4和N2O的排放基本上随酸化累积程度的加深而增加.相关分析显示,土壤pH值不是造成不同累积酸化程度土壤温室气体排放差异的直接原因;CO2和CH4排放差异主要是由于酸化累积过程导致土壤碳、氮以及其他养分元素含量的差异造成的,而导致N2O排放差异的产生原因却十分复杂.

Soil possessing different degree of cumulation acidification was obtained utilizing leach treatment of simulated acid rain （SAR） of different pH value for 42 months; it was incubated indoors and its emission characteristic of greenhouse gases-CO2, CH4 and N2O was studied. Definite acidification cumulation promoted the emission of CO2, but also inhibited the emission when the cumulation reached certain value such as leaching with SAR of pH 3.05 for 42 months. The emission of CH4 and N2O increased basically with acidification cumulation degree. The correlation analysis showed that soil pH value was not the direct cause creating the difference of soil greenhouse gases emission with different degree of cumulation acidification. The difference of CO2 and CH4 emission was created mainly from the differences of the contents soil carbon, nitrogen and other nutrition elements induced by acidification cumulation process; but the cause of inducing the difference of N2O emission was very complicated.