RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2021, Vol. 30 >> Issue (4): 956-967.doi: 10.11870/cjlyzyyhj202104018

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Effect of Land Cover Changes on Land Surface Water and Heat Fluxes over Karst City

WANG Xiuxin 1，2，3，WANG Kaining 1，WANG Minhua 1，SUN Tao 4，ZHU Qijiang 3   

  1. （1．College of Computer Science and Information Technology，Guangxi Normal University，Guilin 541004，China；2．Guangxi Key Lab of Multi-source Information Mining & Security，Guangxi Normal University，Guilin 541004，China；3．State key Laboratory of Remote Sensing Science，Beijing Normal University，Beijing 100875，China；4．College of life Science，Guangxi Normal University，Guilin 541004，China）
  • Online:2021-04-20 Published:2021-05-17

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Abstract: In order to analyze the effect of land cover change resulted from rapid urban expansion on karst thermal environment of Guilin city in Southwest China, land surface water and heat fluxes were estimated with the modified METRIC（Mapping EvapoTranspiration at high Resolution with Internalized Calibration）model from Landsat images in the study area, and validated with the ground measurements. The change effect of the percent cover of land cover such as vegetation, building, water, bare soil and bare rock on land surface water and heat fluxes was analyzed. Results show that the changes of land cover percentages in the middle of the ranges show significant impact on water and heat fluxes than in the extremely low or extremely high values of the ranges. The significant ranges are from 0.1 to 0.8 for vegetation cover percentage, from 0.2 to 0.8 for building cover percentage, from 0.2 to 0.9 for bare soil cover percentage and bare rock cover percentage.  Within the significant ranges, latent heat fluxes rise 4.0%～12.0% and 2.0%～5.0% while sensible heat fluxes drop 5.0%～16.0% and 3.0%～11.0% in response to the 0.1 increase of vegetation cover percentage and water cover percentage respectively. In contrast, sensible heat fluxes increase 5.0%～17.0%, 3.0%～11.0% and 4.0%～14.0% while latent heat flux decrease 3.0%～9.0%, 2.0%～8.0% and 4.0%～9.0% in response to the 0.1 increase of building cover percentage, bare soil cover percentage and bare rock cover percentage respectively. The increment of vegetation cover percentage shows more significant effect on enhancing latent heat flux and reducing sensible heat flux than that of water cover percentage. Meanwhile, the increment of building cover percentage has more significant impact on enhancing sensible heat flux and reducing latent heat flux than those of bare soil cover percentage, a little than those of bare rock cover percentage.

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