中文摘要：

植被状况的变化是反映区域性生态环境状况的重要指标之一，多年植被指数的变化则反映了植被生态环境随时间的变化规律。采用定量遥感技术及斜率法，以全球植被指数MODISNDVI数据作为数据源，对宁夏地区2000--2004年期间的植被指数变化幅度及变化趋势进行了研究。结果表明，从2000年开始，宁夏部分地区的植被指数呈现下降趋势，植被出现退化现象。在此基础上，对贺兰山、六盘山地区植被变化与降雨量的关系做了定量研究，并对红寺堡及银川平原等地区的水资源开发利用对植被的影响进行了较为详细的分析。贺兰山、六盘山的植被主要受降雨量的控制，而红寺堡地区的植被退化是由于水资源的不合理应用导致土壤盐渍化的结果，银川平原的植被则与引用黄河水量的减少和地下水的过量开采有关。

英文摘要：

Variation of vegetation is one of the important the secular vegetation change can reflect the variation indices for regional eco-environmental condition, and regulation of the eco-environment with time. Based on MODIS NDVI, this paper studied the variation trend of vegetation index in the years of 2000 to 2004 in Ningxia area using quantitative remote sensing technique and slope method. According to the result, due to the reduction of diverted water volume from the Yellow River, the NDVI in some of the area became decrease from 2000 onwards. On the basis of the above research, the vegetation variation and different influence factors in some areas, such as Helan mountain, Liupan mountain, Hongsipu area and Yinchuan plain, were analyzed. The vegetation of Helan mountain and Liupan mountain areas were mainly controlled by the precipitation, and the vegetation degradation of Hongsipu area was strongly affected by the unreasonable utilization of water resources and was the result of soil salinization. The decrease of diverted water volume from the Yellow River and the groundwater overdraft were the main influence factors for the vegetation degradation in Yinchuan plain.