Research On Cooling, Humidification And Air Purification Effects Of Urban Green Space With Various Functions

Urban green space plays a very significant role in purification of atmospheric pollution and the balance of urban ecosystems. And dominant ecological benefits of urban green space vary for different types of urban Function Areas; various ecological effects of urban green space are desired.This research tries to explore the ecological effects of different types of urban green space at a functional level. By choosing different functional (comprehensive park, community park, linear park, roadside green space, public utilities green space, industrial green space) urban plots, various environmental indicators (temperature, humidity, SO2, NO2, PM2.5, PM5, PM10, TSP) was measured simultaneously both inside and outside the samples. Data obtained could present the ecological effects of different functional urban green space, which can provide a reference for the construction of urban green space, atmospheric pollution control and urban residents travel activities.The main results are as follows:(1)Microclimatic effect.6different types of urban green space have various degrees of cooling and humidifying effect. By the strongest to the weakest scales, the order of of cooling effects are comprehensive parks> industrial green space>public utilities green space>roadside green space>linear parks> community parks. And the order of of humidifying effects are Industrial green space> public utilities green space>linear parks>comprehensive parks>community parks>roadside green space.(2)Particulate matter removal effects. The average particulate matter (PM2.5/PM5/PM10/TSP) reduction of six different functional types of urban green space is as follows. comprehensive parks:50.96μg/m3(PM2.5)、83.27μg/m3(PM5)、60.85μg/m3(PM10)、48.35μg/m3(TSP); community parks:26.90μg/m3(PM2.5)、35.18μg/m3(PM5)、38.83μg/m3(PM10)、45.80μg/m3(TSP); linear parks:45.11μg/m3(PM2.5)、67.74μg/m3(PM5)、53.14μg/m3(PM10)、54.65μg/m3(TSP); Roadside green space:32.82μg/m3(PM2.5)、28.78μg/m3(PM5)、26.64μg/m3(PM10)、37.06μg/m3(TSP); public utilities green space:33.10μg/m3(PM2.5)、44.71μg/m3(PM5)、41.79μg/m3(PM10)、41.81μg/m3(TSP); industrial green space:106.20μg/m3(PM2.5)、125.83μg/m3(PM5)、160.48μg/m3(PM10)、176.00μg/m3(TSP).(3) Toxic gas purification effect. The average gaseous pollutants (SO2/NO2) reduction of comprehensive parks is61.63μg/m3and59.36μg/m3. The data of community parks is42.75μg/m3and40.87μg/m; linear parks’average amount of reduction is44.77μg/m3and59.48μg/m3; the reduction of roadside green space is45.99μg/m3,60.12μg/m3; public utilities green space is44.34μg/m3and51.73μg/m3; and the industrial green space is116.54μg/m3113.42μg/m3.(5) All types of various functional green spaces can be ordered by pollutants reduction percentage. The list is as follows.PM2.5:comprehensive parks(57.3%)> linear parks(42.7%)>roadside green space (34.6%)>community parks (33.3%)>public utilities green space (27.8%)>industrial green space(21.8%). PM5:comprehensive parks (49.2%)>linear parks (43.9%)>community parks(25.1%)> roadside green space(22.8%)> public utilities green space(21.6%)> industrial green space(14.9%). PM10:comprehensive parks(31.4%)>linear parks(27.7%)> community parks(18.8%)> public utilities green space(16.5%)>industrial green space(14.7%)>roadside green space(13.8%).TSP:linear parks(23.6%)>comprehensive parks(21.5%)>community parks(18.9%)> roadside green space (15.6%)> public utilities green space(14.5%)>industrial green space(13.7%).SO2:comprehensive parks(57.5%)>community parksv (56.1%)> linear parks(50.4%)>roadside green space(48.6%)>public utilities green space(48.2%)>industrial green space(37.5%).NO2:linear parks(57.6%)>comprehensive park(53.9%)>>roadside green space(48.9%)>community parks(46.1%)>public utilities green space(45.9%)>industrial green space (44.3%).(6) Correlation analysis showed that the correlativity between green spaces area and vegetation coverage and pollutants reduction percentage is not obvious...