西藏那曲县NDVI变化及与气象因子、畜牧量相关分析

The Variation of NDVI over Naq County and Relationship with Livestock Population and Meteorological Factors

摘要: 利用NASA提供的16天合成MODIS数据,以归一化植被指数(NDVI)作为植被覆盖特征指标,研究了2001~2008年那曲县NDVI变化特征,分析了温度、降水等气象因子与NDVI关系。结果显示:近年来那曲县最大NDVI、年均NDVI呈减小趋势;NDVI月变化与温度、降水显著正相关;年平均NDVI、植被生长季平均NDVI与气象因子相关性不明显;畜牧总量与植被生长季NDVI显著负相关。

Abstract: Based on the MODIS dataset worked out every 16 days by NASA, NDVI (Normalized Difference Vegetation Index) as index of vegetation cover feature, this paper analyzed the variation of NDVI and the relation between NDVI and meteorological factors over Naqu County in Tibet from 2001 to 2008.Resultsshow that the maximum NDVI and the annual mean NDVI demonstrated a declining trend in the 8 years;the relationship shows a significant positi ve correlation between monthly variation of NDVI and meteorological factors;Variation of annual mean NDVI and mean NDVI of Mar-Aug is not significantly related to meteorological factors;The livestock population is significant negative correlate with mean NDVI of Mar-Aug.