Abstract:Vegetation is one of the main components of the earth’s ecosystem and an important resource for human social and economic activities. Monitoring the dynamic change of vegetation is conducive to regional environmental protection and ecological environment construction. Based on GEE, multiple statistical analysis methods such as Sen+MK trend analysis, MK mutation analysis, partial correlation analysis, multiple regression residual and relative contribution rate analysis were integrated, and an automated comprehensive analysis system of vegetation restoration was constructed, which can be used for vegetation change trend detection and attribution analysis. On this basis, taking Yaozhou District, Tongchuan City, one of the implementation areas of ecological restoration project on the Loess Plateau in Shaanxi Province as an example, the impact of artificial restoration and natural restoration on vegetation change was distinguished to carry out vegetation change trend and attribution analysis in ecological restoration and natural restoration areas. The analysis results showed that from 1990 to 2020, the overall land cover pattern in Yaozhou District showed the distribution characteristics of gradual decrease of cultivated land and gradual increase of forest land and grassland from southeast to northwest. The change characteristics of vegetation cover was fluctuated and increased at the rate of 055%/a, and the sudden change point was appeared about in 2007. The growth rate of NDVI in ecological restoration project area was slightly higher than that in natural regeneration area. The relative contribution rate of climate change and human activities to vegetation change in Yaozhou District was heterogeneous, which was mainly driven by human activities. The relative contribution rate of human activities was 79.10%, and the relative contribution rate of climate change was 15.22%. In the vegetation improvement area, it should be attributed to the ecological restoration project dominated by human activities, and the implementation effect of ecological restoration project was good. In the area of vegetation degradation, it was mainly the joint impact of climate change and human activities.
