基于MODIS的天山山区草地类型植被指数变化特征及其与气候因子的关系

本研究建立基于MODIS的天山山区草地类型植被指数并分析其与气候因子的关系，研究发现：天山山区NDVI分布北部大，南部小；西部大，东部小。降水是影响天山山区NDVI的主要因子。天山山区在温度上升0.1℃，面雨量增加10%的情况下，NDVI增加2.5%。2000~2009年天山山区NDVI年平均值为0.35，温度呈上升趋势，降水呈减少趋势，对植被的生长不利，NDVI呈现出减小趋势，但减小不明显。天山山区NDVI最大值的年份，降水并不是最多的，说明植被的长势需要水分和热量匹配。1961~2009年天山山区的气候变化有利于草地NDVI的增加

MODIS NDVI and its Relations to climate factors in Tianshan Mountains

Grassland resource is an important land resource and also a kind of renewable natural resources, which has very important ecological and economic functions and values. Tianshan mountains is the most important grassland areas in Xinjiang. Effective and accurate monitoring of the grassland vegetation biomass changes, will not only directly related to the decision-making of grassland animal husbandry management, but also indirectly affect the sustainable development of economy and society that is mainly inhabited by minorities. Based on the analysis of the regional characteristics of the climate change in Tianshan mountains, the paper comprehensively studied the effects of climate change on the MODIS NDVI. The results showed in thesis are as follow: (1) The high value area of NDVI in Tianshan mountains mainly distributed in the west and middle area of Tianshan mountains. The variety rule of NDVI is similar with temperature. (2) After the correlation analysis between temperature and precipitation and NDNI, we found that the impact of precipitation on NDVI is greater than that of temperature on NDVI.The maximum multiple correlation coefficient between temperature, precipitation and NDVI. Climate change over Tianshan mountains is propitious to growth of grass.