干旱区典型绿洲地表温度与植被覆盖度相关性研究

摘要/Abstract

摘要： 绿洲空间热环境的研究是深入了解绿洲-沙漠间,以及绿洲内部物质能量流动机理的重要手段。利用TM/ETM+遥感影像反演了于田地区地表温度以及植被覆盖度,在统计地表温度-植被覆盖度二维散点图的基础上,研究不同结构区域下绿洲地表温度与植被覆盖度的相关关系。结果表明:①于田地区地表温度与植被覆盖度呈显著负相关关系,相关系数在-0.79158和-0.48816范围之间。②从1991年到2002年,于田绿洲内部区域地表温度与植被覆盖度散点图上各点分布由密集到分散,表明原有相对整体的植被覆盖地块被打散,成为多种土地类型交错的破碎化地块。③外部荒漠带及绿洲与荒漠交错带区域地表温度与植被覆盖度散点图上各点分布由分散到集中,表明绿洲外部荒漠化程度的逐年加剧,导致了绿洲外围植被覆盖有所降低,植被物种单一,植被多样性也呈现下降趋势。

关键词: 地表温度, 植被覆盖度, 于田绿洲, 相关性

Abstract: The study on oasis thermal environment is important for understanding of energy flow between oasis and desert and in inner oasis. We inverted land surface temperature and vegetation cover in the Yutian oasis using TM/ETM+ remote sensing images,and studied correlation between vegetation coverage and land surface temperature in different sub-regions in the Yutian oasis on the basis of two-dimensional scatter diagram of vegetation coverage and land surface temperature. The result shows there is a negative correlation between vegetation coverage and land surface temperature in the Yutian oasis, and the correlation coefficients range from －0.79158 to -0.48816. From 1991 to 2002, scatter diagram of land surface temperature and vegetation coverage in the Yutian oasis presented a change from concentration to dispersion, and it indicated that the relatively concentrated vegetation coverage pattern was broken up,and presented a fragmentation spatial pattern. From 1991 to 2002, scatter diagrams of land surface temperature and vegetation coverage in oasis-desert ecotones and desert around the Yutian oasis presented a change from dispersion to concentration, and it indicated that the desertification aggravated and vegetation coverage decreased in sub-regions around the Yutian oasis.

Key words: land surface temperature, vegetation coverage, Yutian oasis, correlation

中图分类号:

P463.221

雷磊;塔西甫拉提·特依拜;*;李金香;张飞;田源. 干旱区典型绿洲地表温度与植被覆盖度相关性研究[J]. 中国沙漠, 2011, 31(4): 1001-1007.

LEI Lei;TASHPOLAT·Tiyip;LI Jin-xiang;ZHANG Fei;TIAN Yuan. Correlation between Land Surface Temperature and Vegetation Coverage in A Typical Arid Oasis[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(4): 1001-1007.

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