Evaluation Of Ecosystem Service Function Of Unused Land In Different Soil Types In Laiyuan County

With the development of social and economy,the growing demand for land.Unused land as an important reserve resource can greatly alleviate the contradiction between human and land and ensure food security.However,the unreasonable exploitation of unused land may cause the aggravation of soil erosion,the lower efficiency of nutrient diversion and the biological diversity,the decline of ecological service capacity.The study of ecosystem service function will help to determine the important areas of ecological protection,and provide an important scientific basis for the construction and protection of the ecological environment.This paper takes the unused land in Laiyuan County as the research area,taking the soil type of unused land as the research unit,using the method of material quality assessment to carry out the evaluation and analysis of the ecosystem service function of the unused land,and analyze the influencing factors of the difference in the service function of the unused land ecosystem that lead to different soil species,and put forward the corresponding opening.Directions and suggestions.The conclusions are as follows:(1)The service function of unused land ecosystem under different soil species in Laiyuan county was calculated,by the method of material quality assessment.The factors that resulted in the difference of service function of unused land ecosystem under different soil species were analyzed.Among them,the soil with strong carbon sequestration function is thin rot medium gray brown soil and thin rot medium brown soil,organic carbon density is 23.78t/hm~2 and 16.54t/hm~2.The factors affecting the carbon sequestration function of unused land are soil organic carbon content,geographical distribution,soil thickness and so on.The soil species with strong nutrient cycling function are loam flood alluvial alluvial soil and thin rotten middle gray brown earth.The nutrient cycling amount per unit area is 47102.93t/hm~2 and25620.98t/hm~2.The main factors affecting nutrient cycling are nutrient circulation per unit area,soil structure and soil thickness.The soil species with strong water conservation function is thin gray brown earth soil and thin rotten middle gray brown earth.The amount of water conservation per unit area is 1446.43t/hm~2 and1379.36t/hm~2.The main factors affecting the water conservation function are the non capillary porosity,texture and thickness of soil.Soil conservation functions are strongly sandy flood alluvial tidal brown soil and thin gray brown earth soil.Soil retention modulus is 64.54t/hm~2 and 63.77t/hm~2.The factors affecting soil retention function include rainfall,soil erodibility,slope length and so on.(2)From the perspective of ecosystem services,the development direction of unused land in Laiyuan county is determined.Through the natural breakpoint method,the service functions of each ecosystem in the unused land were divided into four grades.According to the grading results of ecosystem services,the comprehensive classification of ecosystem services in unused land was obtained.The ecosystem services were very strong and strong in the area of 44571.29hm~2and 9050.50hm~2,accounting for 34.73%and 7.05%of the unused land area.According to the evaluation and classification results of unused land ecosystem service function in Laiyuan County,the unused land in the very strong grade is divided into ecological land development zone.The unused land in the strong and general strong grades is divided into ecological agricultural development zone.The unused land in weak grade is divided into ecological construction and development zone.Putting forward suggestions and measures for development and protection of unused land.