锡林浩特草原植被盖度变化研究

STUDIES ON THE CHANGES IN VEGETATION COVERAGE OF XILINHAOTE GRASSLAND

关键词:  锡林浩特  草地植被  植被指数  盖度

Key words:  Xilinhaote,grassland vegetation,vegetation index,coverage degree

摘要:

该文选用锡林浩特市1989年和2002年两个时期的landsat-5 TM影像,剔除了影像中的水体、农田(撂荒地)、城镇用地、云以及云造成的大面积阴影,取1989年草原区与2002年草原区的交集作为具体研究区域,计算出该区域的SAVI指数,结合地面实测数据,得出两个时期锡林浩特地区草原的植被盖度。结果表明:研究区域内2002年有2 790.70km2草地盖度出现不同程度增加,主要分布在东南部和西部小部分地区,占研究区域总面积的19.46%。有11 552.77km2草地盖度出现不同程度降低,占研究区域总面积的80.54%,小部分地区甚至出现了土壤沙化。

Abstract:

This paper selects and uses landsat-5 TM videos taken during 1989 and 2002 in Xilinhaote City,eliminates water surface,wastelands,lands used by town and city,clouds and large areas of shades made by clouds.It takes the intersection of grassland areas in 1989 and 2002 as the studying region;figures out the SAVI of this region.Combining with the on spot survey data,the vegetation coverage degree of grassland in Xilinhaote region during these two periods is gained.Results show that within the studying region,in 2002 the grass coverage of 2,790.70 km2 has been increased by different degree.This increase mainly distributed in the Southeast part and small portion of the West part,which takes 19.46% of the total area of the studying region.The grass coverage of 11,552.77 km2 has been decreased by different degree,which takes 80.54% of the total area of the studying region.Even in a small portion,the land has become desert..