高寒地区土地利用与覆盖变化初步研究--以西藏自治区拉孜县为例

通过2000年卫片解析，做出西藏拉孜县土地利用现状图，与中国科学院遥感所1988年进行的土地利用现状调查成果进行了比较，分析了14年间全县土地利用与覆盖变化的情况．结果显示，拉孜县耕地和草地是最主要的土地利用类型，占全县总面积的76．53％．土地覆盖变化主要表现为草地向其他类型用地的转化，其中草地的90％以上转化为沙地和裸岩石砾地．由于同期自然环境因子没有显著变化，而气温和降水的增加还有利于覆盖增加，导致这一覆盖变化的原因主要是人为破坏，特别是不合理土地利用的结果．相关分析的结果也说明这一点．

PRELIMINARY STUDY OF LAND-USE AND LAND-COVER CHANGE IN HIGH FRIGID REGION:TIBET AUTONOMOUS REGION LAZI COUNTY AS AN EXAMPLE

Based on the interpretation of the Landset TM data in 2000, land use status quo map in Tibet Lazi County was conducted. In addition, the author compared the map made by CAS Remote Sensing Department in 1986, analyzed the land use and land cover change of the whole county during the 14 years. The result showed that both farmland and grassland were main land use styles, which accounted for 76.5% of all. Land cover change took place mostly from grassland to other land use styles, of which more than 90% transformed into sand land and uncovered land. In the same period, the environment had few changes, and the increase of the temperature and rainfall even were beneficial to the land cover. Therefore, it was believed that the unreasonable land use, especially the destruction of the human was the main reason of the changes. And our conclusion was consistent to the result of correlative analysis.