Study On PM_2.5 Concentration Change And Urban Park Recreation Space Evaluation

In order to construct a clean and pleasant park environment,a detailed study of structural characteristics,PM_2.5 concentration,temperature and humidity,tourist behavior characteristics,and tourist spatial distribution,based on work done at six spaces in Hangzhou Huagang Guanyu and Taiziwan Park,was conducted using experimental determination and field survey methods in 6 months of 2018.And the suitability evaluation of park space recreation based on PM_2.5 concentration changes was made.The main conclusions are as follows:?1?The survey community consisted of 4 evergreen broad-leaved trees,4 evergreen conifers,8 deciduous broad-leaved trees,20 small trees,shrubs and vines.The more frequently used arbor species are Magnolia denudate,Cedrus deodara,Osmanthus fragrans.?2?The park has good ecological benefits,and the PM_2.5 concentration has significant spatial and temporal variations.The concentration of PM_2.5 was lower in summer,higher in spring and autumn;the concentration of PM_2.5 was higher in the morning and evening,and lowest in around 2 pm;the plant community had a significant weakening effect on PM_2.5;evergreen coniferous forest community cuts higher PM_2.5 levels;the PM_2.5 concentration in the near water point is lower in summer;the crowd intensive activity will aggravate the PM_2.5 pollution;the PM_2.5 concentration is significantly negatively correlated with the temperature,and is significantly positively correlated with the relative humidity.?3?Walking,flower viewing,photography sketching,etc.are the favorite activities of tourists;women are more inclined to choose group activities;more tourists in spring and autumn,less in summer;plant configuration is an important factor affecting the distribution of tourists,the concave space and waterfront space in the lawn space are more popular with tourists;the motives of tourists are most easily stimulated by green plants,air quality and environmental sanitation.?4?The park has a high level of recreational suitability.Summer is the most suitable season for visitors;from 11:00 to 6:00 pm,it is most suitable for tourists to carry out activities;close to the open water space is very suitable for tourists to carry out recreation activities.This paper takes Hangzhou Huagang Guanyu and Taiziwan Park as research objects,combines PM_2.5 concentration level with park recreation space,discusses the relationship between them and analyzes the influencing factors,it's significant to build a clean and pleasant park environment,and guide tourist activities.