Comprehensive evaluation of land desertification sensitivity in the Horqin Sandy Land based on the coupling of AHP and improved MED ALUS model
The Horqin Sandy Land,as a vital component of the"Three-North"Shelter Forest Project,necessi-tates specific and urgent research on desertification within the region.This study innovatively introduces the Ana-lytic Hierarchy Process(AHP)to select and optimize indicators and factor variables from the original MEDA-LUS model,thereby enhancing the model and developing a new evaluation system for land desertification sensi-tivity.This system integrates indicators from five aspects:climate,soil,vegetation,land management,and so-cio-economic factors to assess the sensitivity of land desertification.Furthermore,the study employs the Geo-graphic Detector(GD)model to explore the factors influencing the spatial differentiation of land desertification sensitivity in the Horqin Sandy Land.The findings reveal that:(1)Vegetation quality index has the highest weight in the index system for assessing land desertification sensitivity,with a weight coefficient as high as 0.4624,followed by the climate and soil quality indices.(2)Areas sensitive to desertification in the Horqin San-dy Land account for 78.22％of the study area,indicating a broad distribution of affected regions.Although the proportion of highly sensitive and extremely sensitive areas is relatively small(8.77％),these areas are concen-trated and severely desertified.(3)Single-factor analysis shows that soil texture has the most significant impact on the spatial differentiation of land desertification sensitivity,followed by soil moisture content.Interaction ef-fects demonstrate that factors such as drought resistance,Net Primary Productivity(NPP),temperature,soil moisture content,and soil texture significantly enhance their impact on the spatial differentiation of land desertifi-cation sensitivity when combined.The findings of this study can provide a scientific basis for formulating target-ed and reliable priority desertification prevention plans and sustainable development models for the region.
Analytic Hierarchy Process(AHP)MED ALUS modeldesertification sensitivityGeographic Detector(GD)Horqin Sandy Land
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