陕北农牧交错带土地利用动态监测研究

陕北农牧交错带生态环境脆弱,土地利用强度大,为掌握该地区土地利用类型面积及空间格局的变化,揭示土地利用变化的机制,利用1986,1993和2000年3期Landsat TM遥感影像,基于遥感和GIS技术相结合的方法,分析了1986~2000年陕北农牧交错带旱地、林地、草地、城乡建筑用地等12种土地利用类型的面积变化和空间格局变化特征。结果显示,15年间旱地面积减少了28.32%,沙地面积增加了3.94%,林地、草地和城乡建筑用地面积分别增加了131240.5,47663.0和8427.1 hm2。表明干旱、人口增长和社会经济发展是导致土地利用发生变化的主要因素。

Study of monitoring of land use change in the ecotone between agri-animal husbandry in northern Shaanxi

Feeble environment and highly intensive land uses change were the main characters in the ecotone agri-animal husbandry in northern Shaanxi of China. This research attempted to monitor the land use process and spatial heterogeneity dynamic,and therefore revealed the driving mechanism. The land use change in the region from 1986 to 2000 was also investigated through land use classification of three sets of the remotely sensed data of TM,acquired in 1986,1993 and 2000. Based on the RS and GIS,the paper analyzed the quantitative and spatial change character of farmland, woodland, grassland, town and countryside industrial land and unused land. The results show that dry farmland has decreased by 28. 32% whereas desertification land increased by 3.94% between 1986--2000. At the same time,woodland and grassland have increased by 131 240. 5 hm^2 and 47 663.0 hm^2 which were converted mainly by dry farmland and desertification land, town and countryside industrial land also have increased 8 427.1 hm^2. The main driving forces of land use change are drought, population increase and socio-economic developing.