生态建设重点区域土地利用变化及驱动因素分析——以潮河流域为例

Analysis on Land Use Change and Driving Factors in Key Regions of Ecological Construction——A Case Study of Chaohe River Basin

以密云水库的重要水源地和生态建设重点区域——潮河流域为研究区,基于GIS技术,分析了20世纪80年代中后期到2005年流域的土地利用/覆被变化;在此基础上,构建了土地利用变化驱动力指标体系,对流域土地利用变化的驱动力进行了主成分分析,分析了1981—2005年政策、经济、人口、科技进步等驱动因素对该流域土地利用变化的影响。结果表明:潮河流域的土地利用类型以林地为主,20世纪80年代中后期到2005年,流域林地、草地的变化最为显著,其中林地面积增加最多,草地面积则大幅减少;政策因素是影响该流域土地利用格局变化的主导因素。

Chaohe River basin, the important water source of the Miyun reservoir and a key area of ecological construction, was selected as the study area. The land use and land cover change from late 1980s to 2005 were analyzed based on the GIS. Thus, the land use change driving force index system was constructed, and the driving forces of the： land use and land cover change were identified by using the principal component anal- ysis. The influence of driving factors including policy, economic, population and technological progress on land use change in the basin was analyzed. The results showed that woodland was the major land use type in the basin, and the changes of woodland and grassland from the late 1980s to 2005 were prominent. The area of woodland increased remarkably, while the area of grassland decreased largely. Policy was the dominant factor affecting land use change in this basin.