2005～2015年三江源国家公园植被覆盖度动态变化研究

STUDY ON DYNAMIC CHANGE OF VEGETATION COVERAGE IN SANJIANGYUAN NATIONAL PARK FROM 2005 TO 2015

为了研究三江源国家公园2005～2015年植被覆盖状况在时空上的变化特征,本文运用地理空间数据云提供的MODIS—NDVI遥感影像数据,利用GIS空间分析功能、ENVI波段运算功能,计算三江源国家公园2005～2015年年均植被覆盖度,从时间和空间上对三江源国家公园植被覆盖度的变化情况做出了分析。结果表明,2005～2015年三江源国家公园植被覆盖度除澜沧江源园区外整体呈缓慢波动上升的趋势,植被覆盖度从西北向东南逐渐增大。分园区来看,澜沧江源植被覆盖度最高,黄河源次之,长江源植被覆盖度最差。

In order to study the changes of vegetation cover in Sanjiangyuan National Park from time to time in 2005~2015,this paper uses the MODIS-NDVI remote sensing image data provided by geospatial data cloud to calculate Sanjiangyuan National Park from 2005 to 2015 by using GIS and ENVI software. The annual vegetation coverage was analyzed in terms of time and space for the change of vegetation coverage in Sanjiangyuan National Park.The results show that the vegetation coverage of Sanjiangyuan National Park in 2005-2015 has a tendency to increase slowly except for the source region of Minjiang River,and the vegetation coverage gradually increases from northwest to southeast. In terms of the park,the vegetation coverage of the Minjiang River is the highest,followed by the Yellow River,and the vegetation coverage of the Yangtze River is the worst.