The Influence Of Urban Landscape Pattern On PM_2.5

In recent decades,urbanization has been rapidly advancing,atmospheric environmental problems are getting worse,and atmospheric particulate matter pollution is continued to increase.In the process of urbanization,the urban landscape change is severe,which will obviously affect the distribution of PM2.5.The influence of PM2.5 on the landscape pattern is discussed,which is of great significance for optimizing urban landscape structure and reducing regional PM2.5 pollution.This study selects the relationship between the landscape pattern and the spatial distribution of PM2.5 at the block scale.The Hangzhou Xiasha Economic Development Zone is selected as the study area.The high-resolution remote sensing image is combined with the ground survey to obtain the landscape pattern data,using fixed+mobile site.Site monitoring method to obtain continuous observation data of PM concentration and meteorological factors,select 2D and 3D landscape pattern index,combine urban architectural form indicators,and use spatial econometric model to couple urban landscape pattern and PM2.5 of different level Relationship researchThe results showed that the global Moran I index of the PM2.5 distribution in the study area reached 0.921(P<0.01)and 0.889(P<0.01)at the two concentration levels.On the regional scale,the impact of various landscape classes on PM2.5 was very different There was a positive correlation betweenindustrial area and PM2.5 concentration on the proportion of landscape area.Urban green space and residential area had a significant weakening effect on PM2.5.For every 1.9%increase in urban green space,PM2.5 concentration will decrease by 1%.The effect of concentration to PM2.5 was related to the background concentration of open space,bare land and water area.At higher concentrations of PM2.5 level,Water area and pm2.5 are positively correlated.At two levels of background concentration,the LM landscape had the potential to reduce PM2.5 concentration;At the patch type scale,the optimization of landscape pattern may have better effect at low concentration level.From the landscape level index,increasing the average shape index of each landscape class can be reduced at the 500 m particle size scale.PM2.5 concentration,green space was available landscape types.The land-rich grid SHDI is higher,but mostly artificial landscape,which promoted the accumulation of PM2.5 and improves the landscape uniformity in a small area.It was beneficial to reduce the concentration of PM2.5;the landscape analysis based on floor classification shows that both CONTAG and SHDI had positive and negative effects on increasing PM2.5 concentration,and the building configuration of the block forms a multi-level floor.The dense pattern of factors could reduce the concentration of PM2.5-Based on the correlation analysis between the three-dimensional index of buildings and the concentration of PM2.5,it was found that height is closely related to the concentration of PM2.5.Appropriately increasing the height of the building inside the block was beneficial to reduce PM2.5 concentration,but a higher height would promote the increase of PM2.5 concentration.