新疆及周边中亚地区土地覆盖变化对地表反照率的影响  

Impact of land cover variations on surface albedo in Xinjiang and its surrounding Central Asian region

作　　者：许赟红 刘琼[1] 陈勇航[1] 魏鑫 刘鑫[1] 张太西 邵伟玲 杨何群 张丞铭 XU Yunhong;LIU Qiong;CHEN Yonghang;WEI Xin;LIU Xin;ZHANG Taixi;SHAO Weiling;YANG Hequn;ZHANG Chengming(School of Donghua University of Environmental Science and Engineering,Shanghai 201620,China;Xinjiang Uygur Autonomous Region Climate Center,Urumqi 830002,Xinjiang,China;Shanghai Ecological Meteorology and Satellite Remote Sensing Center,Shanghai 200030,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]新疆维吾尔自治区气候中心,新疆乌鲁木齐830002 [3]上海市生态气象和卫星遥感中心,上海200030

出　　处：《干旱区研究》2024年第10期1649-1661,共13页Arid Zone Research

基　　金：上海合作组织科技伙伴计划及国际科技合作计划项目(2022E01047);国家自然科学基金重点项目(42030612,41675026,41375021)。

摘　　要：基于MODIS MCD12C1土地覆盖和MCD43C3地表反照率数据,分析2002—2021年新疆及周边中亚地区土地覆盖和地表反照率时空分布特征并探讨土地覆盖变化对地表反照率的影响。结果表明:(1)土地覆盖净变化以裸地和耕地减少、林地和草地增长为主要特征,总变化最大的是草地。塔里木盆地四周裸地转为草地变化明显,中亚中部干旱区草地灌丛化问题严重。(2)裸地转为草地、草地转为林地分别导致地表反照率减少0.006、增长0.009,草地灌丛化导致地表反照率增长0.012。草地转为裸地对地表反照率的影响最大,变化量为0.015,耕地和草地相互转变对地表反照率的影响最小,变化量<0.001。(3)2006—2011年地表反照率变化最明显,显著变化量达34.87%。(4)干旱区地表反照率变化显著于其他区域,且林地的地表反照率高于草地和耕地,导致三者间转变的地表反照率变化趋势区别于其他区域。Based on MODIS MCD12C1 land cover and MCD43C3 surface albedo data,we investigated the spatial and temporal distribution characteristics of land cover and surface albedo in Xinjiang and its surrounding Central Asian region from 2002 to 2021.We also discuss the impact of land cover change on surface albedo.Results demonstrated that(1)The net change of land cover was primarily characterized by the decrease of barren land and cropland and the increase of woodland and grassland,and the largest change was in grassland.The change of barren land around the Tarim Basin into grassland was obvious,and the problem of shrub encroachment in the arid area of Central Asia was serious.(2)The conversion of barren land into grassland and grassland into woodland resulted in a decrease of surface albedo by 0.006 and an increase of surface albedo by 0.009,respectively.The conversion of shrub encroachment resulted in an increase of surface albedo by 0.012.The conversion of grassland into barren and exerted the largest impact on surface albedo,with a change of 0.015.The mutual transformation of cropland and grassland exerted the least impact on surface albedo,with a change of<0.001.(3)The change in surface albedo was the most obvious from 2006 to 2011,with the proportion of significant change being 34.87%.(4)The change in surface albedo in the arid area was significantly higher than that in other regions,and the surface albedo in woodland was higher than that in grassland and cropland,due to which the change trend in the three land types was different from that in other regions.

关 键 词：MODIS数据 土地覆盖 地表反照率 时空差异 新疆 中亚地区 

分 类 号：P461[天文地球—大气科学及气象学]