榆林地区土地沙漠化过程中人文作用的定量分析

The quantitative analysis of anthropological effects in the process of desertification in Yulin Region, Shaanxi Province

本文通过对榆林风沙区沙漠化成因的分析,建立了一个沙漠化过程的数学模型:Y=At·f(P,W),利用数学变换,得出人为作用的变化速度方程:a=y-αp-βw,并且提出了降水,风速弹性的概念和计算方法。通过计算,榆林地区土地沙漠化过程中人为因素的作用为112.3%。沙漠化过程的数学模型的建立和人为作用的定量分离,为预测沙漠化发展,控制人为作用强度,制定沙漠化治理措施,提供了理论依据。

In this Paper, a mathematical model of the Process of desertification is put forward by analysing the causation of desertification;Y=At P (P,W) andbymathemaaticalchanging,an equation of the changing velocity of anthro- pological effects is given: a=y--?P--βw. The concept and calculating Pro- gramme of the Spring of winds and rains are raised. By calculating, the anthropological effects is 112.3% in the Process of desertification in Yulin.ItProvides scientific basis for calculating the develop ment of desertification and controlling anthropological action and harnessing desertification that the mathematical model is put forward.