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

In recent years,PM2.5 pollution has become more and more serious,resulting in PM2.5 related research has become a hot spot,However,there are few studies on the relationship between PM2.5 and spatial distribution of land use,And there are the following problems,such as the study area is small,the time is short,the spatial structure relations research less,does not consider the influence of the neighboring area,etc.Therefore,in order to further study of relationship between PM2.5 and land use spatial distribution,this paper without considering climate change,weather and other meteorological factors and local severe PM2.5 pollutant source such as impact on PM2.5 concentration spatial distribution,Under the premise of this,to explore the relationship between PM2.5 concentration spatial distribution and land use type spatial distribution structure.First of all,Based on the Beijing 35 monitoring site data and tianjin,Inner Mongolia and hebei and other places monitoring site data With the support of GIS software to use the four seasons Study time zone Beijing average concentrations of PM2.5 data for Kriging interpolation space to get Spatial interpolation result figure,Based on the same time Landsat8 remote sensing image of Beijing,With the support of ENVI software to get Beijing land use spatial distribution results,Indicate water,vegetation,bare land and construction land index space distribution hierarchy results figure;Secondly,the time series analysis of PM2.5 concentration and land use type change in Beijing from March 2014 to February 2015 was carried out from the time dimension.From the spatial dimension,the spatial distribution of PM2.5 concentration and the spatial distribution structure of land use are analyzed,And the linear regression equation between land use type indication index and spatial distribution of PM2.5 concentration was established by analysis.Finally,the use of non-relational database MongoDB and Visual Studio 2010 to establish Beijing PM2.5 space-time distribution and land use spatial distribution structure correlation analysis storage and visualization platform,To achieve the Beijing PM2.5 concentration of space-timedistribution and land use spatial distribution structure correlation analysis data effective storage and visual display.The main conclusions are as follows:(1)The PM2.5 concentration in the study area of Beijing has the variation rule of the wave shape and the seasonal variation rule.The four seasons low north south high trends;(2)During the four seasons of Beijing study,the winter area was greenened,the forest area decreased more,the construction land area showed a large increase in winter,the cultivated area grew rapidly in the summer and the other seasons changed relatively little Four seasons of construction land,farmland,greening and bare land are mostly distributed in the central,southeastern and northwest areas of Yanqing County and other places,the forest is more distributed in the northwest region,the water is mainly distributed in Miyun County,Miyun Reservoir area;(3)The spatial clustering and discrete distribution of land use types have a large correlation with the spatial distribution of PM2.5 concentration,The specific relationship is:a,The spatial distribution structure of four seasons of forest,arable land,green and other three types of land use and the spatial distribution of PM2.5 has negative correlationsb,The spatial distribution structure of Spring,summer and autumn three seasons of construction land,bare land and other two types of land use and the spatial distribution of PM2.5 has significant positive correlations;c,The spatial distribution structure of Spring,summer and autumn three seasons of water and the spatial distribution of PM2.5 has significant positive correlations.Beijing PM2.5 spatial and temporal distribution and land use spatial distribution structure correlation analysis storage and visualization platform can achieve the correlation analysis of the data into the effective import,export,storage and visual display.According to the results of the study,for the urban construction planning,for large areas of construction or bare areas should strengthen the vegetation,water,etc.can isolate,reduce or reduce the PM2.5 concentration of facilities;at the same time urban construction to continuously strengthen the vegetation,water and other land Use the way to build and protect the gathering area.