贵州省分光地表反照率时空变化趋势和影响因子分析

Analysis of Temporal and Spatial Trends and Influencing Factors of Spectral Surface Albedo in Guizhou Province

贵州省具有独特的地形地势和复杂的气候条件,分光地表反照率(短波、近红外和可见光)研究不仅能细化地表参数、了解太阳分光辐射特征,还能为探究低纬山区地—气系统能量转换过程中相关分光辐射变量的物理过程提供科学参考。基于MCD43A3反照率数据、MCD15A2H叶面积指数数据、气温、降水、土地利用和土壤水分数据,使用异常变异分析、Theil-Sen(T-S)和MannKendall(M-K)趋势分析以及地理探测器,分析贵州省分光地表反照率时空变化趋势及影响因子。结果表明:(1)分光地表反照率年际变化大小排序为:近红外>短波>可见光,除可见光地表反照率外均呈上升趋势,3个波段地表反照率高值区基本一致,呈东北至西南一线以及西部威宁县分布;(2)在季节变化中,短波和近红外地表反照率大小排序一致为:夏>秋>春>冬,可见光地表反照率为:春>冬>秋>夏;(3)分光地表反照率的主要影响因子均为叶面积指数,其次为土地利用。研究结果可揭示贵州分光地表反照率时空变化和驱动机制,为贵州山区生态保护提供参考。

Guizhou Province,characterized by unique topography and complex climatic conditions,offers an excellent opportunity to study spectral surface albedo(short-wave,near-infrared,and visible light).Analyzing this refines surface parameters and understands the characteristics of solar spectral radiation but also provides scientific references to explore the physical processes of the relevant spectral radiation,variables in the process of energy conversion of the earth-air system in mountainous areas at low latitudes.Therefore,based on MCD43A3 albedo data,MCD15A2H Leaf Area Index(LAI),temperature,precipitation,land use,and soil moisture data,using anomalous variance analysis,Theil-Sen(T-S)and Mann-Kendall(M-K)trend analyses,and geophones,we analyzed the spatial and temporal trends and driving factors of spectral surface albedo in Guizhou Province.The results show that①interannual changes in spectral surface albedo were in the order of size:near-infrared>shortwave>visible.In addition to visible surface albedo being on the rise(the three bands of surface albedo high-value area were basically the same),there was a line from the northeast to the southwest,and the western distribution of the characteristics of the County of Weining;②considering seasonal changes,the size order of short-wave and near-infrared surface albedo was the same,as follows:summer>autumn>spring>winter and that of visible surface albedo was spring>winter.The sizes of short-wave and short-wave albedo were the same,as follows:summer>autumn>spring>winter,and that of visible surface albedo was:spring>winter>autumn>summer;③the driving factors of spectral surface albedo were LAI,followed by land use.The results of this study reveal spatial and temporal variations and driving mechanisms of the spectral surface albedo in Guizhou,which can provide a reference for the ecological protection of mountainous areas in Guizhou.