裸地蒸发条件下土壤盐分运动的预测研究

本文在饱和——非饱和流蒸发,再分配及灌溉入渗实验基础上,针对内蒙古河套灌区土壤盐渍化问题,进行了长期裸地蒸发条件下土壤溶质运移规律的数值模拟研究。就不同地下水埋深H、地下水矿化度Co和蒸发强度Eo状态下的溶质运移分别进行了系统预测模拟,以探讨地下水埋深、地下水矿化度和蒸发强度三项主要因素对土壤积盐、特别是表层土壤积盐量的影响、各因素问的相互影响与相互制约关系,为揭示溶质运移的机制、制定相应的土壤盐渍化防治措施提供依据。

Calculation Study on Soil Salts Movement State Under Evaporation from a bare soil surface

Based on the experiment of evaporation, redistribution and irrigation in the saturated-unsaturated flow and in accordance with the soil salinization problems in Hetao irrigation district, Inner mongolia, the numerical simulation of soil solutes transfer were studied in the long term evaporation from a bare soil surface in this paper. Calculating simulation were done systema- tically under the different depth to the water table level H. concentration of underground water Co and evaporation capacity Ea condition and to probe into the factor of the depth to the water table H. the concentration Ca and evaporation capacity Ea influence on the salt accumulation, especially on the salt accumulation in he upper soil layer and the relation of the influence and condi ion each other among them. After that. to provide scientific basis for the proven ion and control measure of the soil salinization.