摘要
塔里木河下游自2000年第一次应急输水以来,七年间共进行了七次应急输水,总输水量达到20.48×108m3,多次的应急输水给下游的生态环境带来明显的变化,尤其是河道两侧2km内1920km2的植被覆盖变化。本文重点依托EOS-MODIS的NDVI数据产品,结合历次应急输水实测资料,对七次应急输水以来下游研究区的植被覆盖变化进行综合的整体分析。结果表明:1)不同NDVI值所代表的植被对输水响应明显;2)各类植被面积的变化与输水量也存在良好的相关性;3)通过植被指数差值及植被盖度进行分析,表明植被覆盖变化在前五次输水后就已经达到较好的水平,后续两次输水则稳定的保持和推进这种良性变化,下游生态环境进一步改善需要多线程输水。结合实地调研,发现分析结果符合实地状况,说明利用MOD IS数据对下游生态环境目前及未来的变化监测是可行的。
From the first emergency water transporting to lower reaches of Tarim River in 2000, there were seven times of that during the past seven years, and has tranported water 20.48 ×10^8m^3. The ecological environment has changed greatly at the bank of the lower reaches of Tarim River especially 2km beyond the river band about 1920km^2. According to the NDVI data producting by Eos - MODIS, based on the observational data, this re-search analysed the changes of vegetation coverage during seven waters. It was concluded that ： 1. The responses of vegetation to the emergency water transportation is obvious by different NDVI representing; 2. It has relevance between the changes of vegetation coverages and water delivery; 3. The vegetation coverage has been up to the better level during the five waters, the follow two waters maintain and improve the better level. It need water delivery to improve the ecological environment of lower reaches. It was discovered the analysis matches actual condition ; it is viable to use MODIS data to monitor the present and future changes of vegetation coverage and eco -environment of lower reaches.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2008年第9期154-158,共5页
Journal of Arid Land Resources and Environment
基金
新疆维吾尔自治区高校科研计划科学研究重点项目(XJEDU2005I28)
绿洲生态重点实验室开放课题项目(XJDX0201-2006-04)
新疆大学青年教师科研启动基金项目(QN070117)资助
