干旱区稳定蒸发条件下土壤盐溶质迁移的动态预测

<正> 1.导言土壤盐碱化是世界干旱区共同性的问题,也是人类遇到的最古老的环境问题。近30年来,迫于人口压力和食物需求,许多容易开发的土地均已得到利用,人们正在将注意力转向干旱区。由于干旱区自身的特征,土地开发和盐渍化防治,在强烈蒸发条件下土壤盐溶质浓度目标C(Z,t)及迁移预测已成为近代土壤—水环境研究热点之一,成为中国北

A DYNAMIC CALCULATION OF SOIL SOLUTE TRANSPORT UNDER STEADY EVAPORATION IN THE ARID AREA

In accordance with the requirement of continuous development of agriculture in Chinaand the improvement of the medium and low-yielding land, being aimed at the character ofthe natural resources in the arid area and the forming and improvement of the soilsalinization in the soil-water emvironment, the mathematical model and dynamic calcula-tion of soil solute transpot in the saturated-unsaturated soil are done under the com-mplicated conbination of the different evaporation intensity, soil texture and undergroundHydrology comdition by using numerical simulating method of solute dynamics. 40 numeri-cal simulating calculation figures are provided systematically in this paper. The result showsthat soil immobile water in the dead-end has a great influence upon the solute transport insoil under evaporation and the soil absorption has a great influence upon solute transportunder irrigation infiltration condition in the long-term calculation. The results are helpfulto the revelation of solute transported mechanism and the soil-water resources utilizationand dynamic calculation science.