Dynamic Changes of Vegetation in Yueyang City and Its influence on Driving Factors
Yueyang is located in Hunan Province,adjacent to the Dongting Lake basin.The vegetation change trend of the vegetation in this area will have an impact on the ecological protection of Dongting Lake basin.This paper explores the vegetation change and driving factors in this area,in order to provide relevant reference for the ecological environment protection of Yueyang City.In this paper,the Modis NDVI monthly composite data from 2000 to 2016 was used to obtain a normalized vegetation index dataset by the maximum synthesis method.Unitary linear regression trend method was used to analyze the vegetation change trend,and residual analysis method was used to remove the factors of human activities to explore the effects of climate and human activities on vegetation change.The results show that in Yueyang City,the area with significant decrease in vegetation accounted for 0.89％,and the area with significant increase accounted for 76.11％.In terms of driving factors,the correlation co-efficients between normalized vegetation index and rainfall and temperature were 0.456 and 0.698,respectively,and the correlation coefficient with residual was 0.81.In most areas of Yueyang City,vegetation cover improved significantly,while in a small area,vegetation decreased significantly.In terms of driving force of vegetation cov-er change,anthropogenic effect was stronger than the influence of climate change on vegetation cover change.
NDVI data setresidual analysisdriving force factors
NETL
NSTL
万方数据
