模拟酸沉降下南方两种森林土壤对SO42-及NO3-的吸附

通过 3种模拟酸沉降溶液对福建和贵阳两种森林土壤样品的连续浸泡试验 ,研究了土壤对酸沉降中 SO42 -和 NO3-的吸附 ,以及盐基离子输入对这种吸附的影响 .结果表明 ,2种土壤对 SO42 -均有一定的吸附能力 ,但福建土壤的吸附量比贵阳土壤大 .土壤对 SO42 - 的吸附与酸沉降中 SO42 - 浓度及土壤水溶性 SO42 - 含量有关 ,但高浓度的盐基离子输入会降低 SO42 -的吸附量 .土壤对 NO3-的吸附主要发生在表土中 ,且比 SO42 -的吸附量低 ,但比预料的要高

Adsorption of SO42-and NO3-in Two Forest Soils in Southern China Affected by Simulated Acid Deposition

Adsorption of sulfate and nitrate in two forest soils in southern China affected by acid deposition and by input of base cations was studied through a batch experiment by using three simulated acid deposition solutions. The results show that the two tested soils,the Fujian soil and the Guiyang soil, have a certain ability to adsorb SO 4 2- , but the former could adsorb more SO 4 2- than the latter. SO 4 2- adsorption is related to SO 4 2- concentration in acid deposition and water extractable SO 4 2- content in soil; however, input of high concentration base cations decreases this adsorption. NO 3 - adsorption mostly happens in top soils. Although lower than SO 4 2- adsorption, the NO 3 - adsorption in the tested soils is higher than expected.