The Route Selection Research Of County-level Cities Greenway Based On The Source-sink Theory

Greenway coordinates the relationship between the mankind and land,which has important significance on the landscape ecology.Pergola system not only improve the environment of the county-level cities,but also promote the economic development by connecting the important plaques with each other.This article describes the connotations of the greenway,county-level cities,the source-sink theory,and discusses the basis of the county-level cities greenways location under source-sink landscape theory combining the case of Fengyang,which provides a reference for the greenway line selection of the county-level cities.In this paper,the main research results are as follows:1.Define the concept of city at the county level and the source-sink landscape theory in the green concept.County-level city belongs to administrative units at the county level,which is equal to area level,counties and autonomous counties,below the city level.The concept of county level cities in this article not only includes the traditional meaning of the county-level cities,but also includes administrative position with the same counties and autonomous counties.In this paper,the landscape type which is beneficial to the greenway planning would be called “source” landscape,which prevent or delay the greenway progress would be called “sink” landscape.2.The early stage of the urban greenway planning at county level should be fully field investigation.So the paper discusses basic condition from two aspects--environmental factors and human factors.Environmental factors include the external environment and internal environment,and human factors include transportation,consciousness and the late management.3.Based on the study of source-sink landscape theory and the basic condition of urban green road line selection at the county level analysis,the paper summarizes the county-level city green road line selection principle of planning and layout of the green road line selection method,making analysis on the source-sink landscape theory impact factor to provide the basic judgment,so that a more scientific selection would be made of the green development of nodes and routes to choose,giving full play to the source-sink theory in the role of green road line selection.4.The paper finally use Fengyang as a case to show green road line selection planning.To plan as a whole town economic development,strengthen the connection between the towns,improve surrounding the development of economy,Fengyang county green way could be divided into two parts-county greenway and central city greenway.Combined with the source-sink landscape theory model,the paper analyzes the present situation of Fengyang resources,selecting the most suitable development node,adjusting measures to local conditions,reasonable layout,and then eventually forming the county green space structure,called “a surrounded city,transverse and longitudinal into net”.and the center city green space structure,called “one ring and two horizontal longitudinal”.