中国西北地区地表覆被变化对太阳辐射吸收的影响  

Impacts of changes in land cover on solar radiation absorption in northwestern China

作　　者：石莹 别强 苏晓杰 李欣璋 SHI Ying;BIE Qiang;SU Xiaojie;LI Xinzhang(Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,China;National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring,Lanzhou 730070,China;Gansu Provincial Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730070,China)

机构地区：[1]兰州交通大学测绘与地理信息学院,兰州730070 [2]地理国情监测技术应用国家地方联合工程研究中心,兰州730070 [3]甘肃省地理国情监测工程实验室,兰州730070

出　　处：《自然资源遥感》2024年第4期260-271,共12页Remote Sensing for Natural Resources

基　　金：国家自然科学基金青年科学基金项目“基于遥感和WRF模式的干旱区绿洲冷岛效应研究”(编号:42101096);甘肃省青年科技基金项目“祁连山国家公园人类活动强度变化时空过程及生态效应研究”(编号:21JR7RA341)共同资助。

摘　　要：地表覆被类型的变化会影响地表对太阳辐射能量吸收的大小,进而影响地表生态系统中辐射能量的收支平衡,在地表覆被剧烈变化的背景下,地表对太阳辐射吸收的格局和变化对地表热量收支具有重要影响。本研究基于2001—2020年间的MODIS MCD12Q1地表覆被数据、MCD43A3地表反照率数据和MCD43A2太阳天顶角数据,结合相邻2期西北地区的地表覆被类型和地表吸收太阳辐射能量的时空变化分析并探讨地表覆被类型变化对吸收太阳辐射能量的影响。结果表明:①研究区地表覆被类型变化以裸地面积减少和其他类型的扩张为主要特征,面积变化最大的是裸地向草地的转换;②不同地表覆被类型吸收太阳辐射存在差异,其中,水体最大,其次为林地、耕地、草地、建设用地,裸地、永久冰雪吸收太阳辐射较小;③地表覆被类型间转换会导致地表辐射吸收能力不同,草地、耕地、裸地、永久冰雪的转出以吸收太阳辐射增加为主导趋势,而水体和林地则以减少居多;④相同地表覆被类型其吸收太阳辐射值在时间序列上存在差异,建设用地、草地、耕地、裸地和水体以吸收增加为主,林地、永久冰雪以减少为主。本研究结果对中国西北气候变化研究、生态建设和可持续发展提供科学依据和参考。The changes in land cover types will affect the amount of solar radiant energy absorbed by the land surface and then influence the radiative equilibrium of the surface ecosystem.Under the background of dramatic changes in land cover,the patterns and changes of the solar radiation absorptivity of land exert significant influence on the thermal equilibrium of the land surface.Based on the MODIS MCD12Q1 land cover data,the MCD43A3 surface albedo data,and the MCD43A2 solar zenith angle data from 2001 to 2020,along with two adjacent phases of spatiotemporal changes in the surface cover types and the solar radiant energy absorbed by land surface across northwestern China,this study analyzed and explored the impacts of the changes in land cover types on solar radiation absorption.The results indicate that the changes in land cover types in the study area are primarily characterized by reduced bare land area and the expansion of other land cover types,with the largest areal change occurring in the shift from bare land to grassland.Different types of land cover display varying solar radiation absorptivities.Water bodies exhibit the greatest solar radiation absorptivity,followed by woodland,cultivated land,grassland,and construction land,with bare land and permanent ice and snow presenting the poorest solar radiation absorptivities.The conversion of land cover types will lead to different radiation absorptivities.Specifically,the transfer from grassland,cultivated land,bare land,and permanent ice and snow primarily exhibits an increasing trend in solar radiation absorptivity,while that of water bodies and forest land largely displays a decreasing trend.The same land cover type differs in the time series of solar radiation absorption,which primarily increases for construction land,grassland,cultivated land,bare land,and water bodies but decreases for woodland and permanent ice and snow.The results of this study will provide a scientific basis and reference for research on climatic change,ecological construction,and sustaina

关 键 词：地表覆被变化 蓝空反照率 太阳辐射吸收 西北地区 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]