模拟雨水连续淋洗下土壤化学性状动态变化特征的研究

本文从研究正常降雨对土壤性状的影响出发,进行了模拟雨水对酸性紫色土和石灰性紫色土的连续淋洗试验。试验结果表明在模拟雨水连续淋洗150天的过程中,土壤中钙、镁、钾、钠等盐基离子几乎都显示出一定程度的净淋溶特征,土壤中各盐基离子的动力学变化特征几乎都与抛物线扩散方程吻合。淋洗结束后土壤酸度未发生显著变化,但两种土壤CEC值均有所降低。

Effect of Simulated Continuously Rainwater Leaching on Soil Chemical Character

For the sake of studying the ef fe cts of normal rainwater on soil charactersitics , We did the experiment on the continuous leaching of acid purple soil and alkalescent purple soil by simulate d rainwater.The results showed that calcic particle , magnesian particle , potas sic particle and natrium particle almost appeared characteristilc of net eluviat ion during 150 days and that kinetic characteristics of base cations almost acco rded with parabola diffusion equation . After leaching, acidities of the two soi ls Changed insignificantly, but the values of soil CEC were reduced a little.