The Study On The Ecological Function Evaluation And Regionalization Of Secondary Forest Based On 3S Technology And Invest Model In The Mountainous Regions Of Eastern Liaoning Province,China

This article takes Qingyuan County,a typical secondary forest area in the eastern mountainous area of Liaoning Province,as the research area,and uses the sub-class data as the forest land type,and uses the InVEST model to provide four ecosystem services:habitat quality,carbon storage,soil conservation,and water yield in the study area.The functions were evaluated,and the spatial distribution of each service function and its relationship with the four factors of vegetation type,coverage,slope,and aspect were evaluated and analyzed,and the distribution of service function importance was divided.At the same time,site conditions,vegetation coverage,human disturbances,and river distribution were used as sensitivity evaluation factors to evaluate the sensitivity of the study area.Finally,the results of ecological service function zoning and eco-sensitivity zoning were superimposed and analyzed,which resulted in different levels of ecological function zoning in the study area.This result will provide scientific basis for the study area's ecological protection and management.The specific findings are as follows:(1)The spatial distribution of ecological service functions in the study area shows that the forest habitat in the study area is of excellent quality.Natural forests have the highest habitat and shrubs have the lowest habitat quality.With increasing coverage,slope and elevation,the quality of habitats increases.The total carbon storage in the study area is 6.417×10~7t,and the average carbon density is 198.74t/ha.The maximum carbon density can be At268.42t/ha,the carbon density value of the broad-leaved forest is greater than that of the coniferous forest,and the carbon density of the natural forest is greater than that of the artificial forest.The carbon density varies with the coverage,slope,and elevation;The average water supply is 267.28mm,and the total annual water production can reach 8.56×10~8m~3.The areas of high water supply were concentrated in the southern part of the study area.The water supply from high to low followed other broad-leaved forests(alfalfa forests)and shrubs>broad-leaved forests>coniferous forests.In addition,the water supply also decreased with increasing coverage and elevation;the forest land in the study area was dominated by slight soil erosion,with an average soil erosion of 10.36 t/ha and a total soil erosion of 3.34×10~6t,which continued to increase with slope.Increase.The average soil conservation of forest land in the whole region was 1332.23t/ha,and the total soil conservation was 4.31×10~8t.With the increase of slope and coverage,soil conservation continued to increase.(2)The spatial distribution of ecological sensitivities in the study area indicates that the areas with high sensitivity to site factors are mainly distributed in areas with high topography and steep slopes;the areas with extremely sensitive vegetation factors are mainly concentrated in the southeastern boundary of the study area and the eastern part of the west.The insensitivity areas are mainly distributed in the river valleys of the study area;the areas with extremely sensitive social factors are small in area,and they are only distributed in the densely populated and high-GDP industrial and mining areas;the extremely sensitive water area areas are mainly distributed on both sides of the rivers.After being disturbed,it will have a huge impact on the water source.(3)The study area is divided into six levels of I-VI ecological service areas combined with the regional forest ecological sensitivity and ecological service functions.Among them,the area of Grade III and Grade IV of ecological services accounted for the largest proportion and accounted for more than 70%of the total area of forest land.The area has high ecological service functions and can be used for reasonable development and utilization to a certain extent,such as ecotourism and forestry development.Under the exploitation of resources.The level I and II of ecological services accounted for 13.08%of the total area,mainly concentrated in the northeast of the study area.The V-level and VI-level areas of the ecological service accounted for 11.74%of the total area,which was mainly distributed in the secondary forest growth areas with higher altitudes in the study area,the ecological protection of the area should be strengthened,which is conducive to regional ecological regulation.