拉萨-泽当城镇圈1985—2010年土地利用变化的基本特征及空间格局分析

Analysis on the Basic Characteristics and Spatial Patterns of Land Use Changes in Lhasa-Tsedang Town Circle from 1985 to 2010

拉萨-泽当城镇圈是西藏实现跨越式发展和维护地区生态安全的核心区域,其土地利用/覆盖变化对区域土地资源合理利用和生态环境保护有着重要的意义。基于1985,2000,2010年3期Landsat TM/ETM数据,获取拉萨-泽当城镇圈土地利用数据,对其土地利用/覆盖变化的基本特征和空间格局进行研究。结果表明,1985—2010年建设用地、林地持续增加,耕地、水域、未利用地先减后增,草地持续减少,变化中、高速区由雅鲁藏布江和拉萨河沿岸向周边县域扩展;1985—2000,2000—2010年这2段时期主要以草地、水域和未利用地类转化为建设用地、耕地和林地为主。

Lhasa-Tsedang town circle is the core area of achieving leapfrog development and maintenance of ecological safety. It has an important significance in land use/land cover change on regional land rational use of resources and environmental protection.Based on the data obtained from Lhasa-Tsedang land use data from 1985, 2000 and 2010 three Landsat TM / ETM databases, its land use/land cover spatial pattern and basic characteristics were studied. The results showed that for years from 1985 to 2010, construction land, forest land continued to increase. As for arable land, waters and unused land, they decreased first and then increased. Grassland continued to shrink. The high-speed zone and mid-speed zone extended from the Yalu Tsangpo River area and the Lhasa River area to the surrounding counties. In both periods, land use was mainly based on changing grassland, waters and unused land into construction land, arable land and forest land.