基于RS与GIS的三峡库区万州区近22年土地利用变化

Research on Land Utilization Change of Wanzhou District based on RS and GIS in Recent 22 Years

三峡水库蓄水以来,库区水位不断上升,伴随着库区两岸高强度人类活动不断沿海拔向上迁移,土地利用所带来的生态环境问题日益突出。以三峡库区核心区—万州区为例,采用RS和GIS技术手段,对重庆万州1986-2008年间土地利用动态变化的状况进行了跟踪和研究。结果表明:1986-2008年22年间万州区的土地利用方式发生了很大的变化,其中,耕地面积一直处于减少过程;建设用地、林地和水域一直处于增加状态。1986～2008年间万州区土地利用总体变化程度在不同时段差异明显,其中变化最为剧烈的是2000～2008年这一时段。引起万州区土地利用变化原因有政策因素、经济因素和人口因素。该研究为三峡库区土地合理利用提供了依据与参考。

From impounding of the Three Gorges Reservoir, the water level rose sustainably, with human activities moving to high elevation area. Problems which land utilization impacted on eco-environment outstand increasingly. In this paper, the research focused on the change of land utilization by taking Wanzhou district as studied area. Taking RS and GIS as main technologies, the status of land utilization of Wanzhou district were analyzed. The results indicated that the land utilization of Wanzhou district changed obviously in recent 22 year from 1986 to 2008. The area of cultivated land decreased continually, and the area of construction land, water area and forest land increased continually. The degrees of land utilization change were different in difference periods. The most severe period was the years form 2000 to 2008. The main factors caused the change of land utilization includes policy, social economy and population. The study provides reference to rational land use.