The Research On The Method Of Route Selection Of Urban Greenway Network Under The Guidance Of Ecology And Recreation

With the rise and development of greenway,the planning of greenway network has gradually changed from single objective to multi-objective and multi-functional.The core problem of multiobjective compound greenway planning method is how to reasonably plan the greenway route to maximize its benefits in various functions.From the perspective of the development demands of urban greenway,on the one hand,the ecological problems such as the sharp decrease of forest area,the gradual consumption of natural resources,and the serious destruction of biological habitat restrict the sustainable development of the city.At present,the ecological consideration of Greenway route selection mostly stays at the level of landscape spatial pattern.The evaluation factors of Greenway route selection in China are mostly based on the physical and mental needs of people and the way of behavior activities.It simplifies the ecological original intention of Greenway in the construction and practical application of the method,so the ecological benefit of Greenway is not maximized,and the method of Greenway route selection under the ecological guidance needs to be updated.On the other hand,due to the imbalance between the fast-growing recreational demand of urban residents and the supply of existing recreational resources in the city,how to judge the influencing factors of recreational greenway route selection from the perspective of supply and demand,and how to integrate the natural and cultural resources in the city as a whole is a problem worthy of attention in the research of Greenway route selection.Under this background,this paper proposes that we should break through the traditional resource oriented greenway route selection method,guide the greenway route selection in the city area under the dual objectives of ecology and recreation,and propose that we should establish different route selection evaluation indexes respectively for the ecological process of target protected organisms and the recreational law of urban residents,and calculate the potential appropriate path through the method of minimum accumulated resistance Secondly,by discussing the relationship between the ecological network system and the residents' recreational system,the green path coupling strategy at the functional space level and the optimization strategy at the network structure level are established.In the construction method of ecological greenway,the theory of ecology and the construction method of ecological network are introduced.Through the interpretation of the elements and basic network forms of ecological greenway,and through different extraction methods of habitat source,the specific process of ecological greenway route selection is constructed:(1)The ecological process of target species is studied as the research basis and basis of ecological greenway route selection;(2)Extraction of Ecological source: Based on comprehensive comparison of different extraction methods of ecological source,and the analysis of spatial pattern and the evaluation of landscape connectivity,the key ecological sources were extracted.(3)Extraction of Ecological Corridor: Based on Arcgis10.3 software,through the calculation of landscape pattern index,ecosystem service value,and combined with the characteristics of habitat of target animals,the ecological resistance evaluation system of the study area is constructed.Through the method of minimum accumulation resistance model,the ecological corridor between the source areas is extracted preliminarily,and the network is optimized by adding ecological stepping stones.In terms of the route selection method of recreational greenways,by combing the route selection elements of recreational corridors into two aspects of recreational supply and demand,the route selection elements are summarized from two aspects of supply and demand,so as to establish the route selection process of recreational greenways.Through obtaining the multi-source data provided by different open platforms,the resistance surface is constructed from the three aspects of node accessibility of demand source and recreation supply place,recreation potential of path and transformation potential of linear green space.Through the method of minimum accumulation resistance model,the preliminary route selection of recreation greenway is obtained.In terms of the coupling method of ecological and recreational greenway network,this paper discusses the relationship between ecological network system and residents' recreational system,and then discusses the coupling and route selection method of greenway network under the dual guidance of ecology and recreation from two aspects of function space and network structure.At the level of functional space,there are three strategies as follows:(1)protection strategy of surface ecological basement;(2)composite strategy of linear corridor function;(3)coupling strategy of point biological transit space.Finally,taking Lingshui Li Autonomous County of Hainan Province as a case,the quantitative route selection model and coupling strategy are applied to practice.Finally,the ecological greenway,recreational greenway and Ecological Recreational complex greenway are adjusted to different proportions,and four schemes are set up.The advantages and disadvantages of each scheme are evaluated from the aspects of network structure index,corridor function,space balance and fairness,and construction cost.Finally,this paper selectes the ideal urban greenway route selection scheme and priority construction and development route selection area.