黔东南稳定林地地表反照率时空变化与影响因子分析  

Spatio-temporal variations and influencing factors of the stable forest land surface albedo in southeastern Guizhou Province

作　　者：袁娜 刘绥华[1,2] 胡海涛[1,2] 尹霞 宋善海 YUAN Na;LIU Suihua;HU Haitao;YIN Xia;SONG Shanhai(College of Geography and Environmental Science,Guizhou Normal University,Guiyang 550025,China;Key Laboratory of Remote Sensing Applications for Mountain Resources and Environment,Guizhou Normal University,Guiyang 550025,China;Guizhou Ecological Meteorology and Satellite Remote Sensing Center,Guiyang 550002,China)

机构地区：[1]贵州师范大学地理与环境科学学院,贵阳550025 [2]贵州师范大学贵州省山地资源与环境遥感应用重点实验室,贵阳550025 [3]贵州省生态气象和卫星遥感中心,贵阳550002

出　　处：《自然资源遥感》2024年第1期200-209,共10页Remote Sensing for Natural Resources

基　　金：国家自然科学基金项目“山区地形下的贵州地表反照率时空变化研究”(编号:42161029);贵州省科技计划项目“多元尺度遥感的山区耕地非农\\粮化演变特征与扩散机制研究——以黔中地区为例”(编号:黔科合基础-ZK[2022]一般278)共同资助。

摘　　要：地表反照率直接影响地-气系统辐射平衡和地表能量收支。稳定林地植被生态完整,区域小气候相对稳定,且与地表反照率之间关系复杂。该文以黔东南稳定林地为例,基于MODIS地表反照率(MCD43A3)、增强型植被指数(enhanced vegetation index,EVI)(MOD13Q1)、土地利用(MOD12Q1)与土壤水分、气温、降水数据,使用Theil-Sen(T-S)和Mann-Kendall(M-K)趋势分析、相关分析和多元回归分析,探究黔东南稳定林地地表反照率时空变化、与各因子相关性以及驱动因子。结果表明:①稳定林地地表反照率在年际、生长季和休眠季分别在0.102~0.112,0.110~0.113和0.099~0.102间波动上升,整体趋势较平稳,呈中部低、四周高的空间分布格局。②在年际和生长季期,地表反照率与土壤水分呈显著负相关,相关系数分别为-0.951和-0.943;在休眠季地表反照率与EVI呈显著正相关,相关系数为0.933。③地表反照率在年际、生长季、休眠季分别受EVI、气温负向驱动和土壤水分正向驱动,其标准化系数分别为-9.168,-11.332和1.319。该文研究结论有利于正确认识黔东南稳定林地地表反照率的驱动机制,从而为低纬度小区域林地气候变化提供参考依据。Land surface albedo(LSA)directly affects the radiation balance and surface energy balance of the earth-atmosphere system.Stable forest land exhibits integrated ecological vegetation,a relatively stable regional microclimate,and an intricate relationship with LSA.Based on the MODIS LSA(MCD43A3),enhanced vegetation index(EVI,MOD13Q1),land use(MOD12Q1),soil moisture,air temperature,and precipitation data,this study investigated the spatio-temporal variations in LSA of stable forest land in southeastern Guizhou Province,as well as their correlation with various factors and driving factors,through Theil-Sen(T-S)/Mann-Kendall(M-K)trend analysis,correlation analysis,and multiple regression analysis.The results show that:①The stable forest land exhibited LSAs varying between 0.102~0.112,0.110~0.113,and 0.099~0.102,respectively in the interannual period,growing season,and dormant season.These suggest an overall stable trend and a spatial distribution pattern characterized by low values in the central portion and high values in surrounding areas;②The LSA was significantly negatively correlated with soil moisture in the inter-annual period and the growing season,with correlation coefficients of-0.951 and-0.943,respectively.In the dormant season,the LSA was significantly positively correlated with EVI,with a correlation coefficient of 0.933;③The LSA was subjected to the negative driving by EVI and air temperature and positive driving by soil moisture in the interannual period,growing season,and dormant season,with standardized coefficients of-9.168,-11.332,and 1.319,respectively.The results of this study can assist in accurately understanding the driving mechanism behind the LSA of stable forest land in southeastern Guizhou Province,thereby providing a reference for studying the climate change of forest land in small areas at low latitudes.

关 键 词：黔东南 稳定林地 地表反照率 时空变化 驱动因子 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]