Abstract
Abstract. The Yarlung Zangbo River Basin is located in the southwest border of China, which is of great significance to the socioeconomic development and ecological environment of Southwest China. Normalized Difference Vegetation Index (NDVI) is an important index for investigating the change of vegetation cover, which is widely used as the representation value of vegetation cover. In this study, the NDVI is adopted to explore the vegetation condition in the Yarlung Zangbo River Basin during the recent 17 years, and the relationship between NDVI and meteorological variables has also been discussed. The results show that the annual maximum value of NDVI usually appears from July to September, in which August occupies a large proportion. The minimum value of NDVI appears from January to March, in which February takes up most of the percentage. The higher values of NDVI are generally located in the lower elevation area. When the altitude is higher than 3250 m, NDVI began to decline gradually, and the NDVI became gradual stabilization as the elevation is up to 6000 m. The correlation coefficient between NDVI and precipitation in the Yarlung Zangbo River Basin is greater than that with temperature. The Hurst index of the whole basin is 0.51, indicating that the NDVI of the Yarlung Zangbo River Basin shows a weak sustainability.
Highlights
As an important natural resource, vegetation is an indispensable part of the living environment of mankind
Normalized Difference Vegetation Index (NDVI) is an indicator of vegetation growth status and vegetation spatial density (Nouri et al, 2017), which can well characterize the dynamic changes of vegetation
In order to show NDVI in different seasons, seasonal variation of NDVI in the Yarlung Zangbo River Basin is shown in Fig. 2 according to the season of spring (March–May), summer (June–August), autumn (September–November) and winter (December–February)
Summary
As an important natural resource, vegetation is an indispensable part of the living environment of mankind. Vegetation coverage is closely related with meteorological factors. By means of the transfer of water vapor, climate change is adapted by vegetation and characterized to some extent. The global water cycle, biochemical cycle and energy balance are affected by vegetation, which have had a profound impact on ecosystem changes. Meteorology and hydrology are connected by vegetation as well. Vegetation index plays an important role in evaluating vegetation status information such as vegetation coverage, growth vigor and biomass. Normalized Difference Vegetation Index (NDVI) is an indicator of vegetation growth status and vegetation spatial density (Nouri et al, 2017), which can well characterize the dynamic changes of vegetation. The NDVI lower areas was mainly located in the lower altitude regions (Yu et al, 2017)
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