| The green space in the residential area is an indispensable part for the environment of the residential area and is closely related to the life of the residents.In this paper,“Linshuishanju”,a residential area in Lin?an District,Hangzhou,was chosen as the research object with the method of field measurement.From August 2017 to August 2018,one sample of PM2.5 was collected every month in clear weather with only breeze.And the microcomputer laser dust meter was applied to monitor the concentration of PM2.5 every day from 8:00-16:30 at four monitoring points?road green space,house green space,central green space,Square green space?with using anemometer,illuminometer to record temperature,relative humidity,wind speed and light intensity data.Then various methods were resorted to analyze the daily,monthly and seasonal variations of the concentration of PM2.5,such as Spearman correlation analysis,analysis of variance,linear or curve fitting,multiple stepwise regression analysis.And the differences between the concentrations of PM2.5 in four functional green spaces were compared and the influencing factors were considered to figure out,the correlation between PM2.5 concentration changes and meteorological factors and to provide scientific guidance for the future construction of green spaces in residential areas.The results show as follows:?1?Under the conditions of fine weather and breeze,the variation trend of PM2.5 concentration in the four green spaces is basically the same in each season,with generally high concentration in the morning and low concentration at night,and the concentrations hit bottom at around 12:00 at noon.The daily variation trend of PM2.5 concentration in each season is different.The concentration of PM2.5reaches the highest in December and the lowest in May.The PM2.5 concentration reaches the highest in winter and the lowest in autumn.?2?Temperature and PM2.5 concentration are positively correlated in autumn,and negatively correlated in other three seasons;relative humidity is positively correlated with PM2.5 concentration;wind speed is negatively correlated with the concentration of PM2.5.The light intensity and PM2.5concentration are positively correlated in summer and negatively correlated in the other three seasons.The change of PM2.5.5 concentration in the green area of the residential area has the strongest correlation with temperature.?3?The road green space in the residential area should be designed with a multi-layered plant community of high crown density;the green space next to the house should be dominated by a single structure of low crown density.The greenbelt with a multi-layered plant community should be planted at the boundary of the residential area,while a low-density community structure should be used inside the residential area. |
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