近20年来海南岛西部沙漠化土地动态分析

Dynamic Analysis of Desertification from 1986 to 2003 in West of Hainan Island

在GIS技术支持下,利用1986年、1996年和2003年的3期TM数据,定量分析了海南岛西部的不同等级沙漠化土地动态变化过程及其面积与空间上的转换特点。结果表明:17 a来各类沙漠化土地面积显著减少,极重度、重度、中度、轻度沙漠化土地的面积分别减少了58.34%,30.35%,25.88%,64.48%;各类沙漠化土地之间及其与其它土地类型相互之间的转化十分频繁,极重与重度沙漠化土地中分别有53.58%和41.34%的面积没有发生变化,而中度与轻度沙漠化土地分别仅有21.21%和12.02%面积没有发生变化;近17 a来,研究区沙漠化土地动态变化主要是受人为活动干扰作用的结果。

The typical island landscapes and temporal-spatial feature of sandy desertification land dynamic change and their ecological conditions at the west of Hainan Island were conducted and analyzed based on translated data from remote sensing images in 1986,1996 and 2003 using GIS technique.The results indicate that the area of sandy desertification land obviously decrease,and most severe,severe,moderate and light sandy desertification land decrease 58.34%(6.05 km2),30.35%(10.89 km2),25.88%(19.75 km2) and 64.48%(66.16 km2),translated continually the kinds of sandy land types from 1986 to 2003.The sandy land area of most severe(53.58%),severe(41.34%),moderate(21.21%),light(12.02%),have not changed pasts 17 years.In a word,the impacts of human activity are the leading factors that induce dynamic change of the sandy desertification land.