陕西省丹汉江流域土地利用时空变化动态分析

Temporal-Spatial Land Use Change of Danjiang and Hanjiang River Watershed in Shaanxi Province

基于中国西部环境与生态科学数据中心1985,1995和2000年3期土地利用图,利用地理信息系统空间分析和数据统计的方法,分析了丹汉江流域1985—2000年土地利用的数量变化、转移情况和变化速率。研究了该地区主要土地利用类型在不同坡度的分布面积和变化特征。结果表明,耕地、林地和草地3种主要土地利用类型占该研究区土地利用面积的99%以上,是该研究区主要的土地利用类型。1985—2000年,耕地、林地、建筑用地和水体均呈先减少后增加的趋势,但草地相反。15a间,耕地和建筑用地分别增加了105.08和14.85km2,林地和草地分别减少了41.02和77.63km2;在不同坡度上,土地利用变化主要发生在5°～35°,而且在15°～25°之间变化最大。

Based on the three sets of LUCC data（1985,1995 and 2000） from the Environmental and Ecological Scientific Data Center of West China,spatial analysis with GIS and statistics methods were applied to analyze the quantitative change,transferring status,and transferring rate of land use types in Danjiang and Hanjiang river.The spatial distributions and the dynamic changes of land use were also studied in regard to different slopes.The results indicate that cultivated land,forest and grassland were the main land use types in the study area,accounting for more than 99% of the total area.From 1985 to 2000,the areas of cultivated land,forest,architecture and water deceased and then increased,as the grass land showed the opposite trend.Cultivated land and architecture land increased 105.08 km2 and 14.85 km2 respectively,forest and grass land decreased 41.02 km2 and 77.63 km2 respectively during the fifteen years.In terms of slopes,the land use change mainly occurred on the lands with slopes from 5° to 35°,and the land with slope from 15° to 25° experienced the greatest change.