| Abstract:Desertification is one of the important ecological and environmental problems that threaten human existence and development. China's desertification land area accounts for a relatively high proportion, so the continuous monitoring, control and prevention of desertification has always been an important task in China's ecological protection and restoration work. By constructing the Albedo-NDVI characteristic space of Kangbao County from 1990 to 2022, the desertification index of each period was obtained, and then the spatial distribution characteristics and evolution law of desertification in the study area in recent 32 years were dynamically monitored and studied. In addition, this study further explored the influence mechanism of natural and man-made driving factors on the evolution of desertification by collecting and analyzing the change trend of relevant data. The conclusions are as follows: (1) construct the Albedo-NDVI linear regression equation of the "dry edge" of Albedo-NDVI feature space, R2 is greater than 0.7, indicating that the Albedo and the NDVI show a strong correlation. (2) From 1990 to 2022, the proportion of extremely severe and severe desertification in the study areas decreased year by year, and the desertification situation was effectively improved. (3) From 1990 to 2022, the area of desertification reduction in the study area gradually increased, and the area of desertification aggravation gradually decreased. (4) Natural factors (temperature, sunshine number, evaporation amount and wind speed, etc), human factors (land use and population change), and policies related to ecological management (3-North Shelter Forest Program, the Beijing-Tianjin sandstorm source control project, the Taihang Mountain afforestation project, the conversion of farmland to forest, and the comprehensive treatment of groundwater over-extraction) in the study area are all important driving factors for the development and change of desertification. |
