Spatial-temporal Variation of NDVI in Gansu Section of the Yellow River Basin and Its Influencing Factors
This paper aims to analyse the spatial-temporal changes of NDVI in Gansu section of the Yellow River Basin and investigate its influencing Factors. The results is of great significance for ecological monitoring and vegetation restoration. Based on NDVI and cli-mate data, this paper analyzes the temporal and spatial changes of NDVI in Gansu section of the Yellow River Basin from 2000 to 2018 by using linear trend analysis, Hurst index, correlation analysis and residual analysis, and studies its response to climate and human activities. The results show that: (1) NDVI gradually decreases from southwest to northeast. In 19A, NDVI increases in time and space and has a weak persistence trend, with a rate of 0.08/10a. The increasing area accounts for 96.82％ and the weak persistence area accounts for 90.2％; (2) NDVI changes under the joint influence of climate and human activities. NDVI is mainly positively cor-related with climate as a whole, and its correlation with precipitation is stronger than temperature, and the impact of human activities is mainly promoting.
Gansu section of the Yellow River BasinNDVIspatial-temporal variationclimatic factorshuman activities
万方数据
维普
