Study On The Micro-Climate Envierment Of The Central Green Axis Of HE XI In NANJING

With the rapid development of the city,the construction of city green space has gained more and more attention,some of the green ecological greening plays a role not only in the city,while providing recreational environment for city residents daily life.People are more concerned with the function of green space,and pay attention to the ecological benefits of urban green space and the micro climate environment.Accordingly,with the rise of green landscape in the city function,comfort of the designer when green space planning for more consideration of its ecological effects generated by the layout and ecological effects of green space in the crowd in the lead.This paper focus on the ecological landscape planning,landscape on the micro-climate environment,this article selects a block has been built in the city green space:Nanjing He-xi central green axis,the CBD in He-xi Nanjing City,green space as an important part of the CBD district greening,providing recreation for residents,play the function.By means of field measurement and Ecotect software simulation,the authors discuss the ecological benefits and micro-climate.In this paper,the central green axis of the He-xi area is divided into four areas:A,B,C,D,with different composition and structure of landscape elements.A chose a wooded area,sparse forest,water and shade area,water area and no shading micro terrain District 6 plots.The B area has chosen the waterfront area,the dense forest area,the sparse forest area and the tree array square 5 plots.C chose the grassland grass shade area,no shading area,sand pool area and nursery area,tree Plaza 6 plots.The choice of D regional grassland area under no shading,corridor space,pool area and grassland area of Shade 5 plots.A total of 22 plots.In summer,autumn and winter were selected by fine weather outdoor temperature and humidity measuring instrument for measuring temperature and humidity in the central green axis of each sample by analysis,the influence of underlying surface types,shading,water and micro topography on the temperature and humidity in the micro environment.Results:in the summer,trees shade plots are lower than the no trees shade plots at the same temperature,the trees shade plots,wooded site than sparse trees ground temperature is relatively low relative humidity is high.The surface area of the ground surface is lower than that of the hard underlying surface and the humidity is high.There is no obvious cooling effect,and the temperature of the water area is generally higher.In autumn,trees shade the ground than no trees shade ground temperature is relatively low,the humidity is relatively high,but different from the summer,lush trees like trees than sparse samples of high temperature,high humidity.The surface area of the grass mat surface is lower than that of the hard underlying surface.The cooling effect of large water body was obviously enhanced.Small water body is still no significant cooling effect.In winter,because the majority of deciduous tree leaves fall off,with evergreen trees cover the site than the trees cover the site temperature is high,humidity is high.The surface temperature of the ground floor is relatively high,the humidity is relatively high,the temperature around the water body is relatively high,and the humidity is relatively high.Finally,through the comparison of micro-climate in three seasons,the influence of the same factor on Micro-climate in different seasons is obtained.On the west central green axis A,B,C,D four sites of illumination and temperature simulation,comparison of meteorological data meteorological data measured will simulate the phase,verify the feasibility of Ecotect in landscape ecological simulation,verification results show that the Ecotect software used in building the ecological simulation,not according to landscape ecology landscape expression simulation software,its own database of material is difficult to accurately trees on the material,water,soil type and water content of accurate data,so there are some limitations in the simulated landscape.It is difficult to accurately express the real micro-climate conditions.On the basis of the previous measurement and simulation,this paper puts forward the local reconstruction of the central green axis.Taking into account the west central green axis in He-xi CBD,which has a wide range of functions,so keep the main function area in the transformation,small scale transformation of some micro bad weather conditions,mainly the transformation of the 5 regions,are some local transformation based on the original do on the site.Under the premise of not affecting the function to create a better experience for visitors.In this paper,through the study and Simulation of field measurements together explore the central green axis of the landscape in micro climatic conditions,analyzes the influence of various landscape elements of micro climatic conditions in different seasons,and points out the limitations of Ecotect simulation software in landscape ecological direction through the actual measurement and Ecotect simulation software combination.Finally,according to the results of field survey,the author puts forward some reasonable suggestions and local reconstruction for the landscape ecological planning of the central green axis of the He-xi corridor.