Study On Land Remediation Partition Based On The Improvement Of Ecosystem Service Function

Land remediation is not only an effective strategic measure to enhance food production capacity,but also an effective support for balancing urban and rural development and building a new socialist countryside,ensuring long-term national food security.However,Land remediation projects currently implemented to enhance the emphasis on food production,the ongoing projects neglected the impact on the multiple functions and services.Therefore,based on the ecological civilization,how to integrate the green development concept into the rational layout and project construction becoming the main direction in the future,it has important theoretical and practical significance.Ecosystem service refer to the various benefits that human beings derive from ecosystems.The construction of well-facilitated farmland can change the spatial pattern and value of regional ecosystem services.It can be seen that improving the ecosystem service functions and production function of cultivated land are the main objectives of land remediation,while well-facilitated farmland zoning and regulation design aimed to improve ecological service function is the fundamental premise for the effective implementation of ecological farmland construction.It is of great significance to safeguarding national food security and promoting the sustainable development of society and economy.Based on the analysis of the utilization of cultivated land resources and existing problems.Taking Lanzhou City as the research area,used InVEST model to evaluate the spatial pattern of habitat quality,soil retention,carbon sequestration and food supply.Combined the overlay analysis feature in ArcGIS Spatial Analysis Tool to analyze the spatial differentiation of various types of ecosystem services,found out the low-value ecosystem service types for each research unit.Clarified the impact of land remediation projects on ecosystem elements,patterns,processes and services.The construction directions of land remediation in different regions are determined,and the measures of ecological land remediation zoning and regulation.The main findings show that:(1)Habitat quality showed "high in the south and northwest with low in the middle" of study area on spatial distribution pattern.The low value area is located in the northern loess hilly region and the central Yellow River valley region(average 0.17).Soil retention showed "low central,southern and northwest" of study area on spatial distribution pattern.The low value area is distributed in the northwest hills and the central valley area(average 14.96 t/hm~2·a).Carbon sequestration showed similar to habitat quality on spatial distribution pattern.The low value area is included in the hilly landform area in the northwest(average 29 t/hm~2).Food supply showed low in the central river valley area and the large area of the hilly area(average 2.83 t/hm~2·a).(2)Identification of lower value areas of habitat quality,soil retention,carbon sequestration,food supply in the study area.Therefore,the controllable obstacle factors of habitat quality were topography,rainfall,soil quality,soil nutrients and other factors.The controllable obstacle factors of soil retention were topography,rainfall,soil quality,soil water storage,and engineering measures.The controllable obstacle factors of carbon sequestration were such as rainfall,soil,and engineering measures.The controllable obstacle factors of food supply were such as topography,rainfall,soil quality,soil nutrient and engineering measures.Through the determination,topography,soil texture,soil nutrient,slope length,vegetation cover,soil and water conservation engineering factors are adjustable factors,which can be optimized and upgraded through engineering and biological measures.(3)The administrative villages in Lanzhou are divided into three types of upgrading areas:Soil retention promotion area,Habitat quality-Carbon sequestration promotion area,Soil retention-food supply promotion area.Combined with the spatial distribution of the three types of areas,the corresponding remediation mode was proposed.