Abstract
Extensive studies have been conducted over the whole year and various seasons to characterize the temporal and spatial changes in vegetation NDVI. However, there are few studies on the variations of NDVI in different soil hydrothermal processes of the alpine region. So we studied the spatial-temporal variation of vegetation cover and its responses to hydrothermal process in the Qinghai-Tibet Plateau-alpine region. Based on the GIMMS NDVI remote sensing images from 1982 to 2015, the temporal and spatial variations of NDVI in the Naqu river basin at different time scales were studied by using maximum synthesis method, and the linear regression. Results show that the vegetation has an overall degradation trend in the Naqu river basin, with primarily moderate and mild degradation degrees. Completely freezing period, completely melting period and freezing process period are the main vegetation degradation periods.
Highlights
2 Materials and MethodsVegetation, as an important component of terrestrial ecosystem, whose cover change directly reflects the changes of regional ecological environment [1]
Many studies on vegetation dynamics in the Qinghai-Tibet Plateau focus on its changing trend, with time scales of annual, growing season, seasonal and monthly [7,8,9]
NDVI data were obtained from the global AVHRR NDVI dataset provided by the National Aeronautics and Space Administration (NASA) Global Inventory Monitoring and Modeling Studies (GIMMS)
Summary
Vegetation, as an important component of terrestrial ecosystem, whose cover change directly reflects the changes of regional ecological environment [1]. Many studies on vegetation dynamics in the Qinghai-Tibet Plateau focus on its changing trend, with time scales of annual, growing season, seasonal and monthly [7,8,9]. Very few studies focus on the dynamic changes of vegetation in different soil hydrothermal processes [7]. The Naqu River Basin in Nujiang Source Area was selected as a typical study area, and the vegetation dynamic changes of different soil hydrothermal processes in alpine region were discussed. The objectives of this study include: 1) to analyze the temporal and spatial variations of NDVI in Naqu basin in different periods, and 2) to clarify the degree of vegetation degradation and its main degradation periods of different soil hydrothermal processes
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