JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (10): 1738-1749.doi: 10.11849/zrzyxb.2011.10.010

• Resources Evaluation • Previous Articles     Next Articles

Relationship between Urban Land Use and Spatio-temporal Change Characteristics of Surface Heat Effect: A Case Study of Chengdu City

PENG Wen-fu, ZHOU Jie-ming, LUO Huai-liang, YANG Cun-jian, ZHAO Jing-feng   

  1. a. Key Lab of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education, b. Institute Geography and Resources Science, Sichuan Normal University, Chengdu 610068, China
  • Received:2011-01-01 Revised:2011-05-17 Online:2011-10-20 Published:2011-10-20

Abstract: The data for urban land use in Chengdu city was extracted by means of image interpretation based on RS data during 2000-2008. Land surface temperature from TM/ETM+data was retrieved and its spatial distribution was extracted based on Mono-window Algorithm and ERDAS spatial modeling. Urban heat effect of urban land use was analyzed. The result shows that the area of cultivated land and woodland is decreasing and the area of built-up land and water body is increasing within the study period. The spatio-temporal characteristics of urban land use evolvement were the speed of land use change was quick, land use intensity was notable, and the area of cultivated land was invaded due to built-up land occupation. Urban land use change led to the area of low temperature zone a decrease by about 25.927×104 hm2, the area of normal temperature zone and high temperature zone increase by about 12.093×104 hm2 and by about 5.834×104 hm2, respectively. The proportion of built-up land area in high temperature zone dominates absolutely. The average temperature of built-up land is the highest while that of water land and paddy field is the lowest. The spatial distribution pattern of surface temperature of all temperature zones is presented by strip distribution with different shapes. Heat resources in urban districts were densely spotted within the high-tech zone in southern Chengdu, uptown zone in the western, business and trade zone in the central, and industrial base zone in the eastern. The surface temperature of the second ring road was decreased from the downtown region. It is proved that the surface temperature became lower with the increase of distance from the inner city and the impervious surface getting lower at the same time; there is a positive correlation between surface temperature and impervious surface in Chengdu city with a correlation coefficient of 0.73. The spatial distribution of the isotherms with the response of permeable surface is significant. Thus, the built-up land in urban area has a notable heat effect and the heat effect retrieve of water body is huge. The study result has scientific meaning and application value for the evolvement study of urban heat island effect and improvement of human residence environment.

Key words: urban heat effect, urban land use, RS, GIS

CLC Number: 

  • X16