基于RS的武都区植被覆盖度动态变化及其驱动力分析

Dynamic change of vegetation coverage and the driving forces in Wudu district based on remote sensing

以1992、2006和2011年的landsat TM影像为基础,采用基于归一化植被指数(NDVI)的像元二分模型对1992-2011年间武都区的植被覆盖度分别进行计算,分析了其年际间的动态变化,并从自然因素和人为因素方面对植被覆盖度变化进行了驱动力分析,最后采用PCA对选取的影响指标进行定量分析。结果表明:武都区的植被覆盖度总体上呈增长趋势,其中高覆盖区增幅最为明显,达到46.30%。植被覆盖类型以向中高覆盖度和高覆盖度转变为主,2011年中高覆盖度和高覆盖度面积已占总面积的70.57%。人为因素尤其是人口因素是影响武都区植被覆盖度变化的最主要驱动力。

Based on Landsat TM images from 1992,2006 and 2011,we selected the normalized difference vegetation index（NDVI） and used the dimidiate pixel model to calculate the changes of vegetation coverage in the Wudu District from 1992 to 2011.Then we analyzed the dynamic changes over time and the driving force of natural and human factors on the vegetation coverage.Finally,a quantitative analysis of the impact indicators was conducted using PCA.The results are as follows：the vegetation coverage of Wudu district showed a general increasing trend,especially the high coverage area accounted 46.30% of the total area.And the medium-high and high vegetation coverage was of 70.57%.Human factors,especially demographic factors were the main driving forces affecting vegetation coverage.