甘肃省土地沙漠化规模与程度的空间格局分析

通过对1986~2000年两期TM影像数据的处理,得到14年间甘肃省土地沙漠化的最新动态数据。引用沙漠化规模、沙漠化程度指数对甘肃省土地沙漠化空间格局进行了分析,结果表明:无论是沙漠化发生的规模,还是沙漠化发生的程度,甘肃省沙漠化均呈现出以兰州为界的东西部地域分异。表现为:在沙漠化发生规模上,河西走廊地区超过了东部;而在沙漠化发生程度上,则东部超过了河西地区。从发生角度研究,固定、半固定沙地活化是甘肃省沙漠化的主要发生源。

Analysis on Spatial Pattern of Desertification Scale and Degree in Gansu Province

The objective of this paper is to study desertification of Gansu province. Two periods of Lnadsat TM images in 1986 and 2000 are used in our research. The desertification change is calculated for these two periods. We use two indexes, desertification scale and desertification degree, to quantify the desertification spatial pattern. The results show that Gansu province desertification has regional differential between eastern region and western region. The dividing point is Lanzhou. In detail, the desertification scale of the western region is bigger than that of the eastern region. By contrast, the desertification degree of the eastern region is higher than that of the western region. The activation of the fixed and semi fixed sands is the main desertification source in both of these two regions.