PROGRESS IN GEOGRAPHY ›› 2019, Vol. 38 ›› Issue (11): 1770-1782.doi: 10.18306/dlkxjz.2019.11.012

• Articles • Previous Articles     Next Articles

Effects of source and sink landscape pattern on land surface temperature: An urban heat island study in Wuhan City

GAO Jing1, GONG Jian1,2,*(), LI Jingye1   

  1. 1. School of Public Administration, China University of Geosciences, Wuhan 430074, China
    2. The Key Laboratory of the Ministry of Land and Resources for Legal Evaluation Engineering, Wuhan 430074, China
  • Received:2018-12-25 Revised:2019-01-25 Online:2019-11-28 Published:2019-11-28
  • Contact: GONG Jian E-mail:gongjian@cug.edu.cn
  • Supported by:
    the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan), No(CUGL170408)

Abstract:

Due to its adverse impacts on urban ecological environment and the overall livability of cities, the urban heat island (UHI) phenomenon has become a major research focus in various interrelated fields. This study sought to evaluate the intensity of land surface temperature (LST) and the spatial pattern of source and sink landscape in the metropolitan areas of Wuhan City at a local scale, by examining urban surface temperature, landscape density of source and sink, contribution of source and sink, and landscape effect index. Landsat 8 OLI/TIRS data and geospatial approaches as well as statistical analysis were used to facilitate the analysis. The results shows that: 1) The UHI effect in Wuhan City has obvious seasonal changes and the intensity of UHI is strong in summer; the UHI generated by industrial agglomeration areas and economic development zones is more significant. 2) The mean LST of the city gradually declines along the urban-rural gradient after reaching the peak at about 8 km from the city center, showing a "barb-shaped" feature, which is closely related to the change of landscape density. 3) We found a significant strong correlation between mean LST and the density of source (positive) and sink (negative) landscape, and impervious surface is the main contributing factor of UHI. 4) With the same density of water and green spaces, water has greater potential of weakening the UHI effects. 5) Generally, when the areal ratio of sink-source landscape is greater than 0.89 (sink density greater than 0.47), the local landscape pattern has a mitigating effect on UHI. The more concentrated the local sink areas, the more significant the mitigation effect is.

Key words: land surface temperature (LST), source and sink landscape, urban heat island (UHI), urban-rural gradient, Wuhan City