Relationship between urban atmospheric environment and surrounding two-dimensional and three-dimensional landscape pattern in China.

doi:10.13287/j.1001-9332.202105.015

Abstract

Abstract: Atmospheric environment in urban built-up area is severely influenced by the surrounding landscape pattern. Understanding the relationship between air pollution and surrounding landscape pattern at small scale has great significance for mitigating air pollution from the perspective of urban construction. The annual average concentrations of NO₂, SO₂, PM_2.5 and PM₁₀ from 266 air pollution monitoring stations in 30 provincial capitals of China in 2017 were chosen as dependent variables. Ten two-dimensional and three-dimensional landscape pattern indices (number of buildings, building aggregation, building density, impervious water ratio, quantitative density of catering, building footprint area, high building ratio, floor area ratio, total building area and building type Shannon diversity index) within the 3 km area around the monitoring stations were used as independent variables. The effects of landscape pattern on the concentration of four air pollutants were analyzed using the boosted regression trees model. The results showed that the concentration of four air pollutants in the central and northern cities were significantly higher than that in the southeast coastal cities and southwest cities. The most important factor affecting the concentrations of NO₂, SO₂, PM_2.5 and PM₁₀ was the impervious ratio, with relative contribution rates of 40.7%, 36.3%, 51.0% and 51.8% respectively. The results of sub-region analysis showed that the most important influencing factor differed in different regions, including the impervious ratio in the East and Central China; the number and density of buildings in South China; the impervious ratio and diversity of building types in North China; the impervious ratio and the number of buildings in Northeast China, the density of buildings in Northwest China. Such differences were mainly caused by climate, topography, urban planning, and other factors.

Key words: two-dimensional urban landscape pattern, three-dimensional urban landscape pattern, atmospheric pollutant, boosted regression tree, influencing factor

LI Di-kang, LIU Miao, LI Chun-lin, HU Yuan-man, WANG Cong, LIU Chong. Relationship between urban atmospheric environment and surrounding two-dimensional and three-dimensional landscape pattern in China.[J]. Chinese Journal of Applied Ecology, 2021, 32(5): 1593-1602.

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