Analysis of vegetation changes and driving factors in the cultivated area on the north slope of Changbai Mountains
[Objective]Monitoring vegetation change trends on the north slope of Changbai Mountain,analyzing the relationship between vegetation distribution and different factors and changes in forest disturbance,with a view to revealing more comprehensively the vegetation changes in the study area before and after the Natural Forest Resource Protection Project,it provides a scientific basis for evaluating the effect of the Natural Forest Resource Protection Project and formulating vegetation resource restoration measures and ecological environment protection policies.[Method]Based on the Google Earth Engine(GEE)platform,this study used Landsat remote sensing data from 1987 to 2020,using normalized difference vegetation index(NDVI)and normalized combustion rate(NBR),based on Sen-Theil trend analysis,Mann-kendall test,geographic detector and LandTrendr change detection algorithm,the temporal and spatial distribution characteristics and change trend of vegetation cover in Baihe Forestry Bureau were analyzed.Based on the data of annual mean temperature,average annual precipitation,altitude,slope,forest category and forest type,the effects of different factors on the spatial distribution of vegetation cover were studied.[Result]From 1987 to 2020,the overall NDVI in the study area showed an increasing trend,while in 2000,it showed a non-significant decreasing trend in most areas,in particular,the first stage of the Natural Forest Resource Protection Project was the most significant trend of improvement;The spatial distribution of NDVI was strongly explained by temperature and precipitation,followed by forest type and altitude;From 1987 to 2020,the annual disturbance area of the study area showed a fluctuating and decreasing trend.Before 2000,forest disturbance was relatively frequent.After the implementation of the Natural Forest Protection Project in 2000,the area of forest disturbance decreased significantly,and forest disturbance mainly occurred in the central and northern parts of the study area,no significant disturbance was observed in the southern deciduous coniferous forest area during the study period.[Conclusion]Over the past 30 years,the vegetation on the northern slope of Changbai Mountain has shown an improvement trend,and the Natural Forest Protection Project has played an important role in both vegetation improvement and disturbance reduction.
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