摘要
Abstract
In order to clarify the spatial and temporal variation rules of vegetation cover in Shaanxi Province with a long time scale,this study took MODIS NDVI data as the main data source,together with the image element bifurcation model to calculate vegetation cover,and utilized the Theil-Sen trend analysis,the Mann-Kendall trend test,and the Hurst index to analyze the spatial evolution characteristics of vegetation cover in Shaanxi Province from 2000 to 2020,as well as the future change trends were analyzed.Combined with the meteorological data of Shaanxi Province,correlation analy-sis was used to analyze the influence of climatic factors on vegetation cover.The results showed that:(1)the overall vegetation cover in Shaanxi Province from 2000 to 2020 showed an increasing trend,with a growth rate of 0.005·a-1(p＜0.01);(2)the vegetation changes in Shaanxi Province from 2000 to 2020 with spatial scale is dominated by an increasing trend,and the area showing an increasing trend accounts for 75.99％of the total area of Shaanxi Province,of which the area showing significant improvement accounts for 50.29％of the total area of Shaanxi Province;the average value of the Hurst index of vegetation cover in Shaanxi Province is 0.460,indicating that the future of Shaanxi Province's vegetation cover will be dominated by the reverse characteristics.In terms of spatial distri-bution,the areas of sustained improvement in vegetation cover are concentrated in Yichuan countv of Yan'an city and Hengshan District of Yulin city,which accounts for 25.70％of the total area of Shaanxi Province;(3)the correlation between inter-annual vegetation cover and annual precipitation and average annual air temperature in Shaanxi Province shows a positive correlation,with the correla-tion with precipitation(0.141)slightly higher than that with average annual air temperature(0.106).关键词
MODIS NDVI/陕西省/植被覆盖度/时空变化/归因分析Key words
MODIS NDVI/Shaanxi Province/Fractional vegetation cover/spatial and temporal varia-tion/attribution analysis分类
天文与地球科学
