不同种类含盐土壤蒸发规律比较

Comparison of Evaporation Regime from Different Kinds of Saline Soils

采用室内试验的方法,研究了不同盐分种类对土壤蒸发速率的影响。结果表明:盐分不仅会降低土壤蒸发速率,而且不同种类的盐分影响程度不同。在相同的摩尔浓度条件下,盐分对蒸发速率影响程度由大到小依次为NaCl、Mg-SO4、KCl、CaCl2。这种差异,一方面是由盐分种类的差异直接引起,另一方面是不同盐分导致土壤中水分运动的差异,进而导致盐分浓度的不同,也间接导致了蒸发速率的差异。

An experiment was carried out to study the influences of different kinds of salt on soil evaporation. The results show that ： Salt will lower soil evaporation rate generally, and the influence degrees are ranked as NaCl 〉 MgSO4 〉 KCl 〉 CaCl2 in the same mole thickness. This kind of influence difference is originated from the direct influence of different salt on one hand, and on the other hand, because different salt will lead to different movements of soil water and soil salt concentration also, which will affect the evaporation rate finally.