巢湖流域地表热环境与景观变化相关分析及其尺度效应

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Abstract

Based on the Landsat ETM+/TIRS image data, the inversion of Land surface temperature (LST) were conducted by using atmospheric correction method, and the evolution of land surface thermal environment effect was analyzed from 2000 to 2013 in Chaohu Basin. Cell samples at five scales level were obtained through gridding method, the scale effect of LST and its correlations with the surface landscapes were further quantitatively analyzed at specified scales. The results showed that high LST area was mainly concentrated in Hefei city and spread to its peripheries, while low LST area shrank gradually due to turning into moderate LST area from 2000 to 2013 in Chaohu Basin. As a result, the land surface thermal environment effect was enhanced. The correlation analysis between LST and landscape structure indicated that the construction land landscape was the main reason for the land surface thermal environment effect in the basin, while water and woodland landscapes could restrain LST effectively. The influence of landscape pattern on land surface thermal environment effect was significant. The analysis of correlations indicated that strong significant negative correlations were observed between the fragmentation and separation indices of construction and rural land landscapes and LST, but there was significant positive correlation between the fragmentation and separation indices of woodland and water landscapes and LST. LST is most sensitive to the change of landscape dominance index. The dominance index of construction land was significantly positively correlated with LST, while increasing the dominance of woodland and water could significantly reduce the surface temperature. Analysis of the scale effect and Exploratory Spatial Data Analysis (ESDA) for LST indicated that the LST had a significant spatial clustering characteristic in Chaohu Basin, and that the spatial pattern of LST had an obvious scale effect. 2~4km was the suitable extent of the researches on land surface thermal environment in Chaohu Basin. Countermeasures derived from the study for restraining the surface thermal environment in Chaohu Basin included:allocating ecological functional landscape resources, such as woodland and water landscapes, reasonably through planning; strengthening regulations on the growth of construction land; and finally optimizing the landscape pattern.

Key words： surface thermal environment landscape pattern correlation analysis scale effect Chaohu Basin

Received: 22 January 2017

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X87

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	HUANG Mu-yi
	YUE Wen-ze
	HE Xiang

Cite this article:

HUANG Mu-yi,YUE Wen-ze,HE Xiang. Correlation analysis between land surface thermal environment and landscape change and its scale effect in Chaohu Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(8): 3123-3133.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I8/3123

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