Journal of Ecology and Rural Environment ›› 2021, Vol. 37 ›› Issue (6): 724-732.doi: 10.19741/j.issn.1673-4831.2020.0641

Previous Articles     Next Articles

Spatial-temporal Differentiation of Black Carbon Aerosol in Chengdu-Chongqing Urban Agglomeration and Its Relationship with Land Use and Cover Change

WANG Jun-xiu, MU Feng-yun, TIAN Tian, CHEN Lin, LI Qiu-yan   

  1. College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China
  • Received:2020-08-10 Online:2021-06-25 Published:2021-06-24

Abstract: Based on MEERA-2 black carbon aerosol (BC) spatial distribution data and land use and land cover change (LUCC) data between 2000 and 2015, the distribution of BC mass concentration over time and space and characteristics of LUCC in Chengdu-Chongqing urban agglomeration is analyzed by using GIS spatial analysis methods and geographical weighted regression model. The response relationship between BC mass concentration and LUCC is discussed in this study. The results show that:(1) In general, BC concentration showed a concentric pattern of higher in the center and lower around the center, which hadn't changed obviously within the 15 years. The annual mean concentration of BC in 2000, 2005, 2010 and 2015 were 3.86, 4.97, 4.91 and 4.51 μg·m-3, respectively, which showed a trend of first increase and then decrease, with the inflection point appearing in 2005. The spatial scope of the high value was the largest in 2005, which went through an "expand-shrink" changing process. The seasonal mean concentration showed high values in winter, followed by autumn and spring, with the lowest content in summer. So the BC pollution was serious in autumn and winter. (2) The cultivated land, forests, and grassland were the main land-use types from 2000 to 2015. The total area proportion of these three lands accounted for more than 94.61%, and with no significant changes in land-use patterns. The decreasing cultivated land, grassland and increasing construction land were the main trends of LUCC, while water surface, forests and unused land had increased slightly. (3) Generally, BC concentration was the highest on construction land, followed by cultivated land, water surface, forest, and unused land, and was the lowest on grassland. BC concentration decreased when artificial land was transformed to natural land, and vice versa, it would increase. (4) The results of the geographical weighted regression model showed that areas with higher Local R2 value were the areas where LUCC had significant influence on BC concentration, which represented an obvious spatial differentiation.

Key words: Chengdu-Chongqing urban agglomeration, black carbon aerosol (BC), land use and land cover change, geographical weighted regression model

CLC Number: