Study And Planning On The Landscape Structure Of Green Corridors In Changsha City

As an important aspect of landscape ecology,the studies on corridors are permeating urban ecology and urban landscape planning.Green corridor is a key landscape type.This paper communicates clearly about the definition and the classification of green corridor.Additionally,it analyses urban green corridor's structure,pattern and function.The four scales of green corridor planning and the methods for data analyzing,confirming functions,targets,width of various kinds of urban green corridors are studied.This paper applies the above principles and methods to Changsha's green corridor planning, points out the problems of its green corridors by analyzing its corridor's form,network,the relationship between green focuses and green corridors,the relationship between green focuses and green corridors,the relationship between heat island effects and green corridors.The results show that Changsha's all kinds of green corridors in each district;especially the green railway corridors are very scanty.The connectivity of green corridor network is so low and inside environments can not be formed.Some of green focuses don't be connected each other by green corridors.Considering Changsha's natural resources,regional status and the problems of its green corridors,the targets and the functions of Changsha's green corridors planning are pointed out and confirmed,which are as follows,building ecological network connecting each urban green focuses,urban and rural green focuses;conserving and improving the diversity of species and habitats,the quality of atmosphere,the productivity of agricultural and horticultural acts adjacent to green corridors;development controlling and urban containment;improving urban microclimate,reducing heat island effects.Lastly,this paper plans and confirms the width,the direction and the pattern of Changsha's green corridors.It points out that green network should be uninterrupted on the region scale,the urban scale and the district scale.When green corridors go through the thermal area,and their trends parallel the dominant wind direction,heat island effects can be alleviated greatly.