Study on the Change in Vegetation Coverage in Desert Oasis and Its Driving Factors from 1990 to 2020 Based on Google Earth Engine

Fractional Vegetation Cover (FVC) is an important indicator to evaluate the quality of regional ecological environment. Alar City a typical desert oasis region. Investigating spatial and temporal changes in its vegetation cover at different stages guide balance sustainable green development Tarim River basin. Based on Google Earth Engine (GEE) cloud platform, this study analyzed characteristics trends from 1990 2020 using Hurst index coefficient variation. The results show that distribution area last 30 years shows wave-like characteristic with overall apparent upward trend. predominantly increasing phased character. Compared 1990, there significant increase cultivated land 2020. Among them, areas growth mainly occur basin around River. Human activities have weakened influence natural factors FVC. suggest GEE platform can be effective tool for permanently monitoring vegetation.