Desertification monitoring and driving mechanism based on NDVI-Albedo space in the Shiyang River Basin

By extracting NDVI and surface Albedo, the NDVI-Albedo feature space was constructed to monitor desertification from 1995 to 2020 in Shiyang river basin, and 11 driving factors were selected to explore the impact mechanisms of various driving factors by using geographic detector to provide ideas and methods for desertification controlling, comprehensive planning and management decision. The results showed that: 1) The desertification land in Shiyang river basin mainly consisted of sever desertification land and the total desertification area decreased since 1995. The proportion of non-desertified land area increased from 6.2% to 12.6%. 2) The transfer of desertification land in the study area showed that the proportion of desertification land type changed area was 34.5%, and the developed and the reversed area proportion was 7.4% and 27.1% from 1995 to 2010. From 2010 to 2020 the proportion of desertification land type changed area was 27.3%, and the developed and the reversed area proportion was 9.8% and 17.5%. 3) The center of gravity migration showed that severe and light desertification land centers moved most obviously: the severe desertification land center migrated toward the northeast by 15.7km, and the light desertification land center migrated toward the southeast by 14.7km. 4) The major influencing factor of desertification was land-use type, followed by potential evapotranspiration and precipitation, and their explanatory power were above 0.5. The explanatory power of synergistic effect between two factors was significantly higher for desertification degree.