羌塘国家自然保护区近十年归一化植被指数的研究

Research on NDVI temporal and spatial variation of Qiangtang National Nature Reserve

本文利用时序的NDVI数据及气象资料(气温、降水),对羌塘国家自然保护区东、中、西部各县近10年NDVI、气温、降水变化及其相关性进行分析。研究表明,近10年来,保护区东部NDVI呈显著上升趋势,植被覆盖增加,中部和西部呈下降趋势,植被覆盖减少,东部年均NDVI与气温呈显著正相关、与降水呈显著负相关,中部反之;西部年均NDVI与气温、降水均呈显著负相关。

According to the time-series NDVI data and meteorological data（temperature, precipitation）, this article analyzed the change of NDVI, temperature and precipitation and their correlation in the past 10 years of eastern, central and western counties of Qiangtang National Nature Reserve. Studies showed that NDVI had a trend of stable increase in eastern reserve, the vegetation cover was increasing over the past decade, on the contrary, NDVI had a downward tendency in central and western reserves, the vegetation cover was decreasing; eastern annual NDVI and temperature had significant positive correla tion, however, NDVI and precipitation had significant negative correlation, central reserve was opposite; while western annual NDVI and temperature, precipitation had significant negative correlation.