塔里木河下游植被指数的遥感监测

为了了解塔里木河下游9次应急输水的生态环境效益，利用MODIS—NDVI最大合成法、差值法，分析了塔里木河下游植被指数的年际变化情况，结果表明：（1）塔里木河下游地区植被覆盖度变化中增加区面积呈增加趋势。（2）2002年与输水初期相比，植被覆盖度增加区主要分布于上段和中段的老塔里木河及其文阔尔河河道两侧，下段河道覆盖度增加区仅零星分布于距河道0．3km左右的地势低洼区域。2003年以后，下段植被覆盖度增加区面积已达84．30km^2，是2002年的3．16倍，主要分布在距离河道0．5km左右的河道两侧。至2007年塔里木河下游河道两侧植被覆盖度增加区的变化是比较显著的，特别是下段植被覆盖增加区呈带状分布于距河道1．5km左右的范围内。植被指数遥感监测说明塔里木河下游地区的生态环境得到明显改善。

Remote Sensing Monitor to Vegetation Index of Lower Reaches of The Tarim River

In order to understand eco- environmental benefits watered emergency nine times to the lower reaches of Tarim River, the paper analyzed interannual changes of vegetation index of lower reaches of Tarim river. The results showed that： （1） In lower reaches of Tarim river, increased area of vegetation coverage was increased. （2） Compared with the initial water, 2002 year, increased area of vegetation coverage located in the old Tarim river in the middle and upper, and on both sides of the Wenkuoer river, lower river located sporadicly 0.3 km away from the fiver low - lying region. After 2003 year, Lower increased vegetation coverage area was 84.30 km^2, it was 3.16 times than 2002 year, increased area of vegetation coverage located on both sides of the river 0.5 km away from the river. To 2007 year, increased area of vegetation coverage on both sides of the river was obviously, specialy, increased area of vegetation coverage of lower river located band 1.5 km away from the fiver. Remote sensing monitor of vegetation index showed eco - environmental of the lower reaches of Tarim River improved.