Effect of Land Use and Cover Change on Air Quality in Urban Sprawl
2016
Zou, Bin | Xu, Shan | Sternberg, Troy | Fang, Xin
Due to the frequent urban air pollution episodes worldwide recently, decision-makers and government agencies are struggling for sustainable strategies to optimize urban land use/cover change (LUCC) and improve the air quality. This study, thus, aims to identify the underlying relationships between PM<inf>10</inf> concentration variations and LUCC based on the simulated PM<inf>10</inf> surfaces in 2006 and 2013 in the Changsha-Zhuzhou-Xiangtan agglomeration (CZT), using a regression modeling approach. LUCC variables and associated landscape indexes are developed and correlated with PM<inf>10</inf> concentration variations at grid level. Results reveal that the overall mean PM<inf>10</inf> concentrations in the CZT declined from 106.74 μg/m3 to 94.37 μg/m3 between 2006 and 2013. Generally, variations of PM<inf>10</inf> concentrations are positively correlated with the increasing built-up area, and negatively correlated with the increase in forests. In newly-developed built-up areas, PM<inf>10</inf> concentrations declined with the increment of the landscape shape index and the Shannon diversity index and increased with the growing Aggregation index and Contagion index. In other areas, however, the reverse happens. These results suggest that LUCC caused by urban sprawl might be an important factor for the PM<inf>10</inf> concentration variation in the CZT. The influence of the landscape pattern on PM<inf>10</inf> concentration may vary in different stages of urban development.
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