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研究了模拟酸雨对我国南方主要土壤类型盐基离子淋溶的影响,结果表明,pH低于3.0或3.5时,盐基离子淋溶总量明显增加,但pH高于3.5时,则影响不明显.相对于二价Ca2+、Mg2+,K+、Na+淋溶释放受模拟酸雨影响不大.在不同模拟pH阶段,土壤可能由于不同的缓冲与反应机制而导致盐基释放.pH高于3.5时,以溶解淋溶为主,pH=3.5时,以离子交换反应为主,pH低于3.5时,阴离子吸附、矿物风化及粘土的铝边缘和铝氧化物的溶解均可能对土壤离子释放造成影响.
The effects of simulated acid rain on salt-based leaching of main soil types in southern China were studied. The results showed that when the pH was below 3.0 or 3.5, the total amount of salt-based leaching significantly increased, but the pH was higher than 3.5 When, then the impact is not obvious. Relative to divalent Ca2 +, Mg2 +, K +, Na + leaching release by the simulated acid rain has little effect. At different simulated pH stages, the soil may release base due to different buffering and reaction mechanisms. When the pH is above 3.5, the solution is dominated by leaching. At pH = 3.5, the ion exchange reaction is the main factor. When the pH is below 3.5, the anion adsorption, mineralization and the aluminum edge and aluminum oxidation The dissolution of the material may have an impact on soil ion release.