1. College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China 2. College of Surveying and Geographic Information, Lanzhou Jiaotong University, Lanzhou 730070, China 3. Institute of Geographic Science and Resources, Chinese Academy of Sciences, Beijing 100101, China
Bare land is considered to be an important source causing urban heat island (UHI) in the urban underlying surface. However, quantitative description of the contribution of bare land to UHI in different periods of urbanization remains vague. Taking three phase Landsat TM/OLI remote sensing images from 2005 to 2017 of Mianyang, a mountain city in southwest China, as the research area and based on inverting the thermal environment response characteristics of land use/land cover change, the authors constructed the contribution index of bare land to UHI effect and analyzed the spatial and temporal changes of the surface thermal environment of bare land in the process of urbanization. The results are as follows: (1) In 2005—2017, bare land accounted for 4.73% (53.98 km 2 in 2005) to 6.34% (72.28 km 2 in 2011) in the study area, showing a trend of “increasing first and then decreasing” with total area (5.54 km 2) decreasing. Bare land was mainly distributed along new roads, urban development zones and urban-rural boundaries. (2) In 2005—2017, with the spatial agglomeration of bare land patches, the surface temperature of bare land in high-density area was significantly higher than that in low-density area, but the influence of bare land topography (elevation, slope, aspect), patch area and shape on the surface temperature of bare land was not significant. (3) In 2005—2017, the absolute difference of surface temperature between bare land and rural areas increased from 1.73 ℃ to 2.12 ℃, which was lower than the temperature of urban impermeable surface and rural area (3.07~3.23 ℃), and the contribution of bare land to urban heat island effect increased from 34% (2005) to 37% (2011) and finally decreased to 20% (2017). This study can provide a scientific basis for evaluating the spatial and temporal changes of urban bare land elements and mitigating the urban heat island effect.
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2019, Vol. 31 
), 周亮2, 王婷3, 彭黎君1, 郑仕雷1
