甘肃省古浪县土地荒漠化状况及其驱动力探讨

Study on Land Desertification Situation and Driving Factor in Gulang County

古浪县地处干旱半干旱过渡区，土地荒漠化表现为沙质荒漠化、水蚀荒漠化和草场退化3种类型。古浪县的荒漠化土地面积占全县总面积的85．94％，存在着较为严重的荒漠化现象，生态环境极其脆弱。1987—2000年的动态监测数据表明，全县荒漠化程度整体有所下降，但下降幅度不大，局部地区荒漠化在继续发展，特别是北部占全县面积22．51％的腾格里沙漠南缘地区，荒漠化程度已达到了重度。古浪县土地荒漠化的发生，主要原因在于人口数量的增加、地表径流的减少和不合理的牧业活动。

Gulang County stands in intersection of arid and semiarid zone, there are three types of land desertification： sandy desertification, water-eroded desertification and grassland degradation. Gulang County has serious desertification status, eco-environment is instable especially and its area of land desertification has occupied 85.94% of all. The dynamic data of desertification survey from 1987 to 2000 indicated： in whole county, the general desertification degree is some declining but declined degree is slight, and land desertification keeps on developing in part of range, especially the land desertification degree reached weighty in the south edge of Tegeli desert that area occupied 22.51% at county＇ s north. The main causes of land desertification at Gulang County have three driving factors including incremental population, decreasing surface water resources and improper grazing course.