Spatial And Temporal Distribution Of PM2.5 In Nanchang And Its Relationship With Spatial Distribution Of Land Use

The rapid development of economy inevitably brings about the problem of PM2.5 pollution.At present,the research on PM2.5 is also paid attention to.Nanchang,as a key development area in Jiangxi Province,has to face with the problem of PM2.5.In this paper,the correlation between spatial distribution of PM2.5and the land use in Nanchang is discussed by means of remote sensing technology.In this paper,the aerosol optical thickness is inversed by MOD02₁KM data,and then the PM2.5 in Nanchang area is predicted by the AOD inversion data of aerosol optical thickness.At the same time,the land use classification data of Nanchang area are obtained by Landsat8 remote sensing image.Finally,the relationship between spatial distribution of land use and PM2.5 in Nanchang was analyzed by means of ArcGIS and SPSS.?1?The spatial distribution of PM2.5 in four seasons of Nanchang shows that the distribution of PM2.5 in spring and autumn is similar,the PM2.5 in summer is relatively light,and in winter is the most serious.?2?Based on landsat8 remote sensing data,Nanchang land is classified into five types: woodland,green land,water body,construction land and bare land.The spatial distribution of land use was analyzed about spring,summer,autumn and winter in Nanchang.The results show that the forest land is mostly distributed in the southwest,the green land is basically distributed in every area of Nanchang,and the construction land is mostly concentrated in the urban area of Nanchang city.The vegetation distribution in autumn and summer season is wider than that in spring and winter season.The vegetation growth in spring can effectively reduce the exposure of buildings?including bare land?and the distribution region of building index values is mostly in the central area of the city.The area of water body in Nanchang has littlechange in four seasons,and the normalized water body index of Poyang Lake in Northeast of Nanchang is relatively large.?3?The spatial distribution of PM2.5 was related to the spatial distribution structure of land use,which showed that the concentration of PM2.5 in Nanchang showed seasonal variation in different land use types.The concentration of PM2.5 in summer was the lowest in all land use types,autumn is the second,spring is higher than spring,and winter is the highest.Compared with PM2.5 concentration of different land use types,the corresponding PM2.5 over woodland was the smallest.There was a negative correlation between the spatial distribution of NDVI and the spatial distribution of PM2.5.There is a positive correlation between the spatial distribution structure of NDBI and the spatial distribution of PM2.5 concentration in the two types of land use,such as architectural land and bare land.There is a positive correlation between PM2.5 concentration and the spatial distribution of NDWI.The results have important reference value for guiding to reduce PM2.5 pollution and rationally plan land use in Nanchang.