Vegetation index change in the upper reaches of Han River and its attribution analysis

Vegetation plays an important role in regulating hydrological processes and maintaining ecological balance in the basin.It is of great significance to analyze vegetation changes and their driving factors in the upper reaches of the Han River.This paper uses NDVI data of MODIS/Terra and Land Cover remote sensing data to analyze NDVI changes of different land use types in the upper reaches of the Han River,and combines meteorological data and DMSP light data to analyze the impacts of climate change and human activities on vegetation NDVI,in order to find out the dominant driving factors of vegetation index changes. The results show that,the NDVI in the upper reaches of the Han River increased from 2001 to 2017,averaging between 0.5 and 0.62.The inter-annual NDVI variation of the same land use type was not significant.The NDVI change trends of different land use types were basically the same.The vegetation types sorted by NDVI from high to low are deciduous broad-leaved forest,mixed forest,grassland,agricultural land,dense shrub,and evergreen coniferous forest.The monthly average maximum temperature is the dominant factor affecting the monthly NDVI change.The summer NDVI change has a strong correlation with the sunshine hours and precipitation,and the winter NDVI change has a high correlation with temperature.The correlation coefficients of temperature and precipitation with annual NDVI change are higher than that of the average light intensity change.On the annual scale,meteorological factors have more influence than human activities on vegetation changes.

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