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《Journal of Chongqing Normal University(Natural Science)》 2018-04
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Temporal and Spatial Change Analysis of Land Surface Temperature and Land Cover Influence in a Karst City,Guilin

WANG Kaining;WANG Xiuxin;School of Urban and Environmental Sciences,Liaoning Normal University;College of Computer Science and Information Technology,Guangxi Normal University;State key Laboratory of Remote Sensing Science,Beijing Normal University;  
[Purposes]The impact of urban rapid expansion on thermal environment needs to be analyzed in Guilin,a karst city,from1990 to 2015.[Methods]The temporal and spatial changes of land surface temperature(LST)were derived from 12 Landsat images with the proposal of the emissivity estimation method in the mixed pixels on karst hills.Then the derived affecting factors on LST,including vegetation coverage,building percentage,water percentage,bare rock percentage and bare soil percentage,was analyzed.[Findings]1)LSTs in the study area of buildings,roads,dry soil and bare rocks on sunny karst slopes are highest,while LSTs of water body and dense vegetation on shady karst slopes are lowest.LSTs of dense vegetation on sunny karst slopes also are very low.LSTs of sunny karst slopes are 1~3℃ higher than those of shady karst slopes under solar radiation.2)The percentage of high temperature pixels which are defined as their LST above that of dense forest on the karst hills shows an upward trend from 61.9% to75.2% during 1990~2015 in the study area.3)LSTs decreases respectively from 0.5℃to 0.7℃,from 0.2℃to 0.4℃ with 0.1 increasing of vegetation and water body percentages,and increases respectively from 0.4℃to 0.7℃,from 0.4℃to 0.6℃,from0.3℃to 0.5℃ with 0.1 increasing of building,bare soil and bare rock percentages in the study area.[Conclusions]LSTs are influenced by human,vegetation coverage and terrain in Guilin.
【Fund】: 国家自然科学基金地区科学基金项目(No.41561008);; 广西自然科学基金(No.2014GXNSFAA118289);; 广西高校科学技术研究项目(No.2013LX020;No.KY2015LX007)
【CateGory Index】: P237;TP751
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