基于NDMVI的大青山自然保护区植被覆盖度坡向分异研究

Study on Slope-direction of Vegetation Coverage of Daqing Mount Nature Reserve Based on NDMVI

运用RS与GIS技术，以Landsat TM影像为数据源，基于归一化差值山地植被指数（NDMVI）定量分析了大青山自然保护区植被覆盖度随坡向的分异规律。结果表明：保护区的植被覆盖度总体上随坡向呈现明显的分异；大青山保护区植被覆盖度的坡向分异随海拔的升高而越明显。垂直分异规律在不同的坡向上不相同：北坡和西北坡在海拔1400m以上植被覆盖度变化随高度增加而越不明显，1400m以下则随高度增加而越明显；其它坡向，在1600～2000m的海拔高度上，植被覆盖度差异相对更高和更低海拔上的植被覆盖度差异较小；所有坡向在1200～1600m的海拔上植被覆盖度差异很小。

This paper analyses the slope-direction of vegetation coverage of Daqing Mount Natural Reserve based on normalized difference mountain vegetation index( NDMVI) by using RS and GIS with the Landsat TM image data. The results show that( 1) Obvious differences of coverage on different slope aspects exist in Daqing Mount Natural Reserve;( 2) The slope-direction differentiation of vegetation coverage in Daqing Mount Natural Reserve becomes more obvious with increasing altitude and vertical distributions on different slope aspects are not same;( 3) On north and northwest slope,the change of vegetation coverage become unapparent over the altitude of 1400 m,while it become more apparent below the altitude of1400m;( 4) On the other slopes,the change of vegetation coverage on the altitude of 1600 m to 2000 m is smaller than it on higher and lower altitude;( 5) On all slopes,the difference of vegetation coverage on the altitude of 1200 m to 1600 m are not very noticeable.