长吉图地区土壤保持服务功能时空变化与供需匹配OA北大核心CSTPCD

[Objective]Different soil remediation treatment needs in the Changchun-Jilin-Tumen region were determined and the characteristics of supply and demand were matched based on the spatio-temporal variations of soil conservation service founction in the region in order to provide a scientific basis for promoting the effective implementation of regional soil ecological protection.[Methods]The InVEST model was used to quantitatively assess the soil conservation service functions of cities and counties in the Changchun-Jilin-Tumen region in 2000,2010,2020.The relationship between the supply and demand of soil conservation services and their spatial and temporal changes were analyzed in order to identify the priority areas in need of targeted management and to formulate soil remediation strategies.[Results]From 2000 to 2020,the soil conservation intensity of the Changchun-Jilin-Tumen region ranged from 0.00 to 2 590.42 t/km2;the erosion reduction service function ranged from 0.00 to 1 544.23 t/km2,and the sediment retention service function ranged from 0.00 to 2 452.20 t/km2,with significant differences in soil conservation service levels between regions and obvious spatial and temporal differentiation characteristics.The supply and demand matching situation in the study area was relatively balanced,and there was no low supply and high demand matching type.There were four matching types between supply and demand of regional soil conservation services:Soil conservation services were sustainable when supply and demand increased simultaneously and when supply increased and demand decreased;Soil conservation services were not sustainable when both supply and demand decreased and demand increased while supply decreased.The proportion of unsustainable areas in need of treatment increased over time,accounting for 68.15％(erosion reduction)and 72.57％(sediment retention)by 2020,concentrated in the east and west parts of the study area.In the middle part of the study area,the soil retention service was significantly weakened.[Conclusion]In the study area,the spatio-temporal variations in soil conservation service founction were obvious,and the central-eastern part,eastern tail end,and western part of the Changchun-Jilin-Tumen region were identified as the soil sensitive area,soil fragile area,and soil restoration area,respectively.Soil ecological management work in these areas should focus on soil remediation,soil conservation,and soil restoration,respectively.