Study On Ecological Security Pattern Of Haitan Island And Optimization Of Ecological Land Use Toward "Multiple Planning Integration"

With the development of society and the continuous expansion of cities,great changes have taken place in the urban land use pattern.However,during the period of cities'development and expansion,it brings many problems,such as the problems of ecological environment,of the imbalanced distribution of urban resources and so on.The study of ecosystem service function can quantitatively assess the distribution of multiple natural resources,in order to achieve the goal of reasonable distribution of natural resources,to adjust the balance of economic development and environmental protection.Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)has been widely used in the assessment of ecological service function,and can realize the visualization of the evaluation results.Based on the ecological security pattern,comparing various planning layers and"Multiple Planning Integration"results,to guide the multiple planning,after conflict detection of land use,balance,optimization,implementation of ecological land of Haitan Island ecological security pattern,for the improvement of Haitan Island"Multiple Planning Integration"proposed measures the corresponding.From the perspective of ecological service function,this paper assesses water conservation function,soil conservation function and biodiversity function of Haitan Island using InVEST model,quantitatively studies on various ecosystem service functions.Then overlay analysis is applied to assess the comprehensive ecosystem service function and natural break-point method is also used to grade to get the important ecological service function area.Treated as a source of ecological area,Haitan island ecosystem service function security pattern is.constructed using MCR model.Based on the spatial pattern,the follow-up study of this paper compares the land use status layer and"Multiple Planning Integration"layer,after the detection,trade-off and optimization of land use conflicts,finally from the perspective of "Multiple Planning Integration confirms ecological land of ecological security pattern,in order to provide suggestions to further perfect"Multiple Planning Integration"of Haitan Island.The main research contents and results are as follows:(1)Evaluation of ecosystem service functionWater conservation function:this paper calculates the area's distribution of water conservation function by using the water yield module in InVEST model.Water conservation function is higher in north middle Haitan Island than surrounding areas.The calculation principle of water conservation uses precipitation minus evapotranspiration.In Haitan island north middle area,the higher precipitation and lower evapotranspiration represents the higher water conservation function.Soil conservation function:The calculation principle of soil conservation function in InVEST uses the universal soil loss equation to calculate the potential soil erosion and actual soil erosion,then soil conservation function is acquired by using potential soil erosion minus actual soil erosion and soil conservation grade is divided combined with the"soil erosion classification standard"(SL190-2007).The stronger function of soil of mountain woodland areas in Haitan Island shows that woodland has a stronger function of soil conservation.Biodiversity function:This function is calculated by using the habitat quality module in InVEST model.In reference to previous studies,the higher the habitat quality is,the stronger biodiversity is.The high biodiversity of Haitan island is located in the natural land types,such as the beaches and woodlands in the surrounding waters.But the areas with lots of construction land or frequent human activities has a weak biodiversity function.(2)Construction of ecological security patternBased on the assessment of ecosystem service function,water conservation,soil conservation and biodiversity,which are three kinds of ecological service function,are overlaid to get the important functional areas through natural break-point grading method.As ecological source area,land cover types are treated as the resistance factor,then minimum cumulative resistance(MCR)is applied to construct ecological security pattern.The study area is divided into ecological sources,low safety level pattern,middle safety level pattern,high safety level pattern and other areas,and the ecological corridor is extracted by using cost path tool in ArcGIS,the ecological security pattern makes scientific guidance for a variety of planning and for the adjustment and optimization of map layer of"Multiple Planning Integration".(3)Balance and optimization of ecological landFrom the perspective of ecological security pattern,this paper evaluates and guides land use planning,urban overall planning and economic development planning.Based on the pattern of ecological security,this paper realizes the adjustment and optimization of land use types with"Multiple Planning Integration",and puts forward relevant suggestions and measures for ecological control.From the perspective of ecosystem service function,this paper constructs the ecological security pattern in order to improve the planning.And at the beginning of planning,this paper takes the distribution status of soil and water resources and habitat resources into consideration and achieve ecological protection by rational allocation of resources,therefore,the ecological problem will be eliminated at the beginning of the development and construction,avoiding first development post protection strategy,and to get equal importance of development and protection.