Study On Tree Planting Strategy Based On Thermal Comfort Of Shade Space

In the shade space of urban park,arbor is the most important link in the greening structure system,which has the greatest impact on thermal comfort.Specifically,arbor crown brings a certain shade effect in summer,deciduous arbor can meet the lighting needs of residents in winter,and the resistance of arbor crown to solar radiation,the guidance of wind direction and the regulation of temperature are the important factors affecting microclimate DBH,height,crown diameter,planting method and plant spacing all affect the thermal comfort effect of the shade space.The canopy opening,porosity,Lai,PPFD are important parameters affecting the shade effect.The purpose of this study is to quantify the tree planting design strategy of Chengdu Plain,and the conclusion can guide the tree planting in urban parks Plan to create a livable and pleasant urban living environment.Taking the urban park shade space of Chengdu Plain as the research object,the parameters of urban park shade space that affect human thermal comfort are taken as the research quantitative,and the control effect of the type of shade space and arbor planting on Residents' thermal comfort is analyzed by the method of field measurement and questionnaire survey.The data of shade space are calculated and measured by using Win SCANOPY software,testo480 and solar radiometer Through regression analysis of the data,we come to a conclusion and propose the arbor planting strategy.The specific work is as follows:(1)Based on the investigation of the shade space under the thermal comfort of human body,through the investigation of the physical data of residents,thermal comfort induction voting,environment and microclimate cognition,combined with the specific tree planting status of Chengdu plain city park,it is found that tree planting can improve the thermal comfort from tree species,layout,canopy and planting spacing.(2)The data of arbors in the typical urban park of Chengdu Plain in summer and winter were tested and summarized.The canopy of arbors was analyzed by using the software of Win SCANOPY to explore the correlation between the factors and parameters affecting the thermal environment of the shade space,to study the parameter relationship affecting the shade space,and to quantify the arbor planting design strategy in the shade space.In this study,the canopy leaf area index,porosity,opening,canopy closure,light flux density(PPFD)and canopy light interception density,which have the greatest impact on solar radiation,were calculated,and the canopy opening and canopy light interception density were quantified by canopy data and tree planting spacing.The results showed that the canopy opening and canopy light interception density were positively correlated,and the linear relationship was a quadratic function.The leaf area index and canopy light interception density were positively correlated The light interception density is negatively correlated,and the linear relationship is exponential or logarithmic.The canopy opening is positively correlated with the tree spacing.The relationship of specific parameters is conducive to guiding the tree planting design of Chengdu Plain Urban Park.(3)Based on the analysis of the correlation between the hot comfortable vote and the shade space of the residents in the typical urban park of Chengdu Plain,the testo480 instrument was used to test the different shade spaces of the urban park of Chengdu Plain.Combined with the residents' hot comfortable vote,the subjective and objective methods were used to analyze the correlation between the tree planting and the hot comfortable in the different shade spaces,and the branch points of the trees were analyzed The effects of canopy height,crown diameter,planting distance and canopy on the thermal environment were analyzed.(4)Based on the theoretical and data analysis,this paper summarizes the experimental conclusions,and summarizes the tree planting strategies based on the thermal comfort of the shade space from the four aspects of tree species,layout,canopy and planting spacing.