从石羊河流域沙漠化土地分布看区域协调发展

石羊河流域沙漠化状况的遥感监测和野外调查表明:(1)2000年石羊河流域中、下游沙漠化土地总面积7711.91km2,沙漠化类型主要表现为耕地沙漠化、草地沙漠化和沙丘活化、流沙入侵,其中下游以沙丘活化和流沙入侵为主,中游以耕地沙漠化为主;(2)下游民勤地区已经发展到了沙漠化过程中的顶级状态,中游地区沙漠化土地则多处于正在发展的过程中。通过对研究区沙漠化土地分布状况的分析,初步得出结论:由区域经济发展不平衡而导致的区域间不合理的资源分配是下游地区沙漠化的根本原因,而中游地区的环境退化又是下游地区沙漠化的必然结果。

Sandy Desertification Status and Region Development in Shiyanghe River Basin

Based on TM image data and using remote sensing method we systematically monitored the desertification land status of the Shiyanghe River basin in 2000, and has also in situ investigated into its status. The following results have obtained: (1) The total area of sandy desertification land is {7 711.91} square kilometers. Farmland desertification, steppe desertification and fixed dunes activation and drifting sand intruding are the main sandy desertification types in the study area. In details, dune activation is the main type in lower reach and farmland sandy desertification is the main type in middle reach.(2) Most of the sandy desertification land in the lower reach developed into the process of very severe sandy desertification and most of the sandy desertification land in the middle reach into the process of latent and light sandy desertification.From the sandy desertification status, we concluded that the irrationally resource distributing among the different river reaches resulting from the unbalance economy development is the fundamental cause of desertification in the lower reach, and desertification of the lower reach will necessarily result in the environmental degradation of the middle reach.