利用样点调查与Landsat8影像数据建立山体地表温度与坡度的关系  

Establishing the Relationship Between Mountain Surface Temperature and Slope Using Sample Point Survey and Landsat8 Imagery Data

作　　者：陈传 黄晓园[1] 王艳霞[1] 崔换峰 Chen Chuan;Huang Xiaoyuan;Wang Yanxia;Cui Huanfeng(Southwest Forestry University,Kunming 650224,P.R.China;Changzhi Early Childhood Normal College)

机构地区：[1]西南林业大学,昆明650224 [2]长治幼儿师范高等专科学校

出　　处：《东北林业大学学报》2024年第1期67-73,共7页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(42061004);云南省科技计划项目(202101BD070001-093);云南省“兴滇英才支持计划”青年人才项目(20120021)。

摘　　要：山区地表温度是林火预测预报的重要影响因子。山区地表温度机理的研究受稀疏气象观测站点及MODIS产品(1 km)空间尺度的限制,常以综合作用规律及宏观地形因子分析为主,缺乏微尺度地形要素的相对独立作用阐释。以我国西南纵向岭谷区为研究区,利用多期landsat8影像数据及样点实测数据,使用地理信息系统空间分析方法,通过消除或减弱海拔、坡向等地形因子的影响,定量分析坡度与地表温度相对独立关系。结果表明:(1)不同尺度下地表温度、地表温度标准差与坡度的关系受坡向影响不同。(2)30 m尺度上,西、西北、北、东北坡向的坡面上地表温度与坡度呈负向相关关系,坡度越大,地表温度空间变异越小,地表温度递减率分别为0.202、0.239、0.207、0.166℃/(°);东坡向的坡面上的地表温度与坡度呈先减小后微弱增大的二次曲线变化关系;东南、南、西南坡地表温度随着坡度增大分别以13.6、13.92、11.51℃上下波动。(3)样点尺度上,北、东北、东南、南、西南和西坡向的坡面上地表温度与坡度也呈负相关关系,地表温度递减率分别为0.106、0.396、0.168、0.111、0.235、0.077℃/(°);东、西北坡向内地表温度随着坡度的增大总体上减小,样点尺度的地表温度更易受到局地环境的影响。The surface temperature in mountainous areas is an important influencing factor for forest fire detection.The study of surface temperature mechanism in mountainous areas is limited by sparse meteorological observation stations and the 1 km spatial scale of MODIS,often focusing on the analysis of comprehensive effect laws and macro topographic factors,lacking an independent effect interpretation of micro-scale topographic elements.Taking the southwest longitudinal ridge-valley region as the study area,using multi-period Landsat 8 image data and actual measurement data,GIS spatial analysis methods were used to quantitatively analyze the relatively independent relationship between slope and surface temperature by eliminating or reducing the influence of topographic factors such as elevation and slope direction.The results show that:(1)the relationship between surface temperature,standard deviation of surface temperature,and slope at different scales is affected differently by slope direction.(2)At the 30 m scale,the surface temperature on slopes facing west,northwest,north,and northeast is negatively correlated with slope.Larger slopes lead to smaller spatial variations in surface temperature,with decreasing rate of surface temperature of 0.202,0.239,0.207,and 0.166℃/(°),respectively.The surface temperature on east-slope oriented slopes shows a quadratic curvilinear variation relationship with slope gradient,decreasing first and then slightly increasing.The surface temperature on slopes facing southeast,south,and southwest fluctuates around 13.6,13.92,and 11.51℃,respectively,as the slope increases.(3)At the sample site scale,the surface temperature on slopes facing north,northeast,southeast,south,southwest,and west is also negatively correlated with slope,with temperature decrease rates of 0.106,0.396,0.168,0.111,0.235,and 0.077℃/(°),respectively.The surface temperature on slopes facing east and northwest generally decreases with increasing slope,and the surface temperature at the sample site scale is more s

关 键 词：Landsat8影像 地表温度 坡度 坡度指数 

分 类 号：S716.2[农业科学—林学]