Abstract
Land use change has an important influence on the spatial and temporal distribution of PM2.5 concentration. Therefore, based on the particulate matter (PM2.5) data from remote sensing instruments and land use change data in long time series, the Getis-Ord Gi* statistic and SP-SDM are employed to analyze the spatial distribution pattern of PM2.5 and its response to land use change in China. It is found that the average PM2.5 increased from 25.49 μg/m3 to 31.23 μg/m3 during 2000-2016, showing an annual average growth rate of 0.97%. It is still greater than 35 μg/m3 in nearly half of all cities. The spatial distribution pattern of PM2.5 presents the characteristics of concentrated regional convergence. PM2.5 is positively correlated with urban land and farmland, negatively correlated with forest land, grassland, and unused land. Furthermore, the average PM2.5 concentrations show the highest values for urban land and decrease in the order of farmland > unused land > water body > forest > grassland. The impact of land use change on PM2.5 is a non-linear process, and there are obvious differences and spillover effects for different land types. Thus, reasonably controlling the scale of urban land and farmland, optimizing the spatial distribution pattern and development intensity, and expanding forest land and grassland are conducive to curbing PM2.5 pollution. The research conclusions provide a theoretical basis for the management of PM2.5 pollution from the perspective of optimizing land use.
Highlights
The city is the densest place for human activities and is the space where air pollutants are most likely to accumulate [1,2]
We consider the city-level vector boundary in China as the input feature zone data and the grid PM2.5 data is used as the input value raster, with the statistics type set to mean
The spatial distribution pattern of PM2.5 presents the characteristics of concentrated regional convergence
Summary
The city is the densest place for human activities and is the space where air pollutants are most likely to accumulate [1,2]. Since the 1980s, with the rapid urbanization process and social and economic development, peoples’ material wealth and living standards have been improved in China, but this has brought a series of environmental problems [3,4]. It highlights the serious contradiction between accelerating the urbanization process and abiding by ecological and environmental protection. Developed countries such as Europe and the United States have experienced air pollution problems for more than. It is prominent in the BeijingTianjin-Hebei region to the east of Hu Line, Yangtze River Delta, Chengdu-Chongqing
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