Characteristics of vegetation cover changes in the upper reaches of the Yellow River Basin and the influencing factors
Vegetation coverage provides a good reflection of the ecological status of the watershed,and remote sensing technology is important for the large-scale,efficient,and accurate monitoring of changes in vegetation coverage.This study examined the temporal and spatial variation characteristics of vegetation coverage in the up-per reaches of the Yellow River Basin from 2001 to 2020,using the Hurst index and Cv coefficient to test persis-tence and stability.The effects of climate,topography,and population on changes in vegetation coverage were an-alyzed.The results showed that the vegetation coverage increased from northeast to southwest,with an increasing trend in 69.25%of the areas.Stable areas accounted for 73.79%of the total area,and areas of strong sustainabili-ty accounted for 66.49%.(2)Of the total area,75.63%was positively correlated with precipitation and 39.28%was positively correlated with temperature.(3)As elevation increased,vegetation coverage first increased and then decreased;coverage was positively correlated with slope but not significantly related to aspect.(4)The vege-tation coverage was highest when the population density was 65-85 individuals·km-2 and the GDP was 27000-37000 yuan·km-2,indicating that human activities promoted changes in the vegetation cover in the upper reaches of the Yellow River Basin.The results of this study provide a scientific reference to support the high-quality eco-logical development of the upper reaches of the Yellow River Basin.
fractional vegetation covertemporal changeinfluencing factorsupper Yellow River Basin
国家科技期刊平台
NSTL
万方数据
