三江源植被覆盖区NDVI变化及影响因素分析

为研究三江源植被覆盖区归一化植被指数(Normalized difference vegetation index,NDVI)的变化及其影响因素,本研究利用植被类型、中分辨率成像光谱仪(Moderate-resolution imaging spectroradiometer,MODIS)NDVI产品和气象数据等,结合...

Analysis on the NDVI Change and Influence Factors of Vegetation Cover in the Three-River Headwaters Region

This study was aimed to study the changes and influencing factors of the Three-River Headwaters Region Index (NDVI). Vegetation type,moderation-resolution imaging Spectroradiometer (MODIS) NDVI products and meteorological data were collected. Trend analysis and partial correlation analysis were performed to analyze the spatial and temporal changes of NDVI in the vegetation coverage area of the Three-River Headwaters Region,and the main factors that caused NDVI changes. The results showed that the NDVI of 38.49% of the study area increased while 1.49% of that significantly decreased. Climate change promoted the increase of NDVI in the study area,in the western area it was mainly caused by the increase of temperature and in the eastern area it is caused by the increased precipitation. In addition,the melting of frozen soil caused by rising temperature caused soil moisture loss in high-slope areas,which in turn reduced the NDVI of water-sensitive vegetation such as meadows.