Assessment of vegetation change in desertification prevention and control areas using long time series satellite images
In order to explore the technical methods for quantitatively evaluating the effectiveness of desertification prevention and control in desert areas of northwest China,this paper studied the desertification prevention and control areas in the northern part of Gulang County.Based on Landsat images from 2000 to 2021,the dimidiate pixel model was used to invert vegetation coverage,and trend analysis was adopted to analyze the trend and spatial characteristics of vegetation coverage change in the study area.The influencing factors that caused changes in vegetation coverage were explored from both natural and human factors.The results show that:① From 2000 to 2021,the vegetation coverage of the desertification prevention and control areas in the northern part of Gulang County shows a fluctuating upward trend,reaching the maximum value during the monitoring period in 2019.The vegetation coverage of different types of sandy land shows significant differences,with the average vegetation coverage in descending order as follows:fixed sandy land>semi-mobile sandy land>saline alkali land>semi-fixed sandy land>mobile sandy land.② The areas with significantly improved vegetation coverage are mainly located at the border between deserts and oases.There are areas of vegetation degradation caused by human development and construction on the southern edge of the desert.The vegetation coverage in the northern desert is basically stable,slightly degraded,moderately improved,and slightly improved,with a north-south staggered distribution in strips.③ The change in vegetation coverage in desertification prevention and control areas is not only affected by precipitation but also related to many major desertification prevention and control projects implemented by the local government.
long time series satellite imagedesertification prevention and control areasvegetation coverage
国家科技期刊平台
NSTL
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