关键词: NDVI时间序列数据集, 生态功能区, 空间变化, 气候要素, 相关分析

Abstract:

Precipitation and surface temperature are two most important climatic factors.They are also two main factors that affect the distribution and change of the vegetation.Based on the average annual precipitation,temperature,NDVI and snow depth data of many years,the changes in different climate factors and their correlation with NDVI were analyzed.The result shows that:most of the regions in north Xinjiang tend to be wetting,especially in the central area of the Junggar Basin,where the slope of the precipitation change is between 1.15 and 1.42;the annual average precipitation in the high altitude mountain area that only makes up 2% of the whole region decreases obviously,the sharpest decreasing slope of the precipitation change is -0.203;the overall temperature of north Xinjiang shows a warming trend,of which the slope of temperature increase shows a significantly gradient pattern from high mountains(2.04)to lowland(-0.044);NDVI is closely related to average annual rainfall and temperature variations.We should attach importance to strengthening the construction and management of vegetation on the scale of ecological function area.

Key words: time-series NDVI data, ecological function zone, spatio-temporal change, climatic factors, correlation analysis