不同高程下的土地利用/覆盖动态变化研究——以嘉陵江中下游地区为例

Research of Dynamic Change of Land Use/Cover in Different Altitude of Middle and Lower Reaches of the Jialing River Region

运用GIS空间分析方法,以1：5万地形图、1986年和2000年LandsatTM影像数据为基础,分析了不同高程下土地利用/覆盖动态变化的差异,从土地利用/覆盖动态变化的面积和速度两个方面揭示了高程与土地利用/覆盖动态变化的关系。结果表明：1986-2000年间林地在300～900之间增加的面积最大,草地在300～600之间减少幅度最大,建设用地在600以下增加显著,耕地在1200 m以下都都有大量减少。从变化的速度来看,各种土地利用类型均呈现出随高度的增加单一土地利用类型动态度下降的趋势,而综合土地利用动态度随高程的增加而从0.26%下降到0.04%。

Based on remote sensing imageries of 1986 and 2000,and a relif map with a scale of 1： 50000 ,the dymamic change of land use in different altitude of middle and lower reaches of the Jialing river region was analyzed using GIS. The result indicated that from 1986 to 2000 forestland increased most in the altitude from 300 to 600 and grassland deduced most rapidly in the altitude from 300 to 600. On the other hand , the resident area increased markedly and farmland deduced largely. As soon as the change rate, the single indexes of land use degree of all land types exclusively indicated trend of descecding , and the comprehensive index of land use degree also decreased from 0.26% to 0.04%.