Effects Of Plant Communities On Microclimate Environment In Five Residential Areas Of Hangzhou

With rich ecological resources,Lin'an District of Hangzhou is one of the first state-level demonstration areas for ecological civilization construction and has been named “National Garden City”.With the promotion of the policy of “comprehensive integration of Hangzhou” and the continuous acceleration of cultural tourism and residential greening construction,Lin 'an will be the most promising “ecological residential area'' in Hangzhou.Reasonable greening and building layout of residential area can help to improve microclimate and create a good living environment,which is an important means to alleviate urban heat island effect.Numerical simulation has become an important trend in recent years to study the influence of green space on microclimate.Excessive urban temperature has aroused widespread concern in the society,and it is of great significance for urban construction to take scientific measures to alleviate urban heat island effect.This study of hangzhou linan five residential area of 20 groups of plant community microclimate for spring,summer,autumn three seasons of measurement,and combined with numerical simulation software,the quantitative analysis of plant community structure and layout of micro climate impact,as well as on the improvement of the human body comfortable degree,help reduce residential thermal environment,improve human comfort,for residential building layout and green land planning and provide the scientific basis and practice guidance,promoting the ecological environment construction of residential area.The main conclusions of this study are as follows:(1)Plant community's influence on the micro climate different residential area,plant community of leaf area index and air temperature,relative humidity,light intensity significantly correlated(P <0.05),and the correlation of wind speed was not significant(P > 0.05),shrubbery and halosols deserts two kinds of plant community structure of micro climate affect the difference was not significant(P >0.05).The seasonal sequence of the influence of plant community on microclimate is: in autumn,>in summer > in spring.Different building layout patterns will have different effects on outdoor air temperature,and the layout of buildings with density alternate with density can obtain the best cooling effect.In summer,the comfort level of human body is relatively lowest,and the microclimate environment needs to be further improved.Sample plot D2 is the plant community sample plot with the highest degree of improvement to microclimate and human comfort in the three seasons of spring,summer and autumn.(2)The numerical simulation results show that the model is accurate and the error is within a reasonable range.The influence of arbor-based plant community structure on microclimate and human comfort in summer is ranked as follows Joe irrigation > Joe grass > Joe shrubs;The ranking of the improvement effect of the greening layout of the residential plant community on human comfort is:banded > centralized > group > scatter-type.The above studies show that the optimization of plant community and building layout can improve the microclimate of residential areas.In summer,the comfort level of human body is relatively the lowest,so the residential area should choose the layout of buildings with different densities,as well as plant communities with large leaf area index,Joe irrigation structure and banded layout,which is conducive to improving the microclimate and human comfort level in summer.