Rapid Shrinking of Glaciers in the Middle Qilian Mountain Region of Northwest China during the Last ～50 Years     

王璞玉  李忠勤  高闻宇 《中国地质大学学报(英文版)》2011,(4)

During the past five decades, fluctuations of glaciers were reconstructed from historical documents, aerial photographs, and remote sensing data. From 1956 to 2003, 910 glaciers investigated had reduced in area by 21.7% of the 1956 value, with a mean reduction for the individual glacier of 0.10 km2. The relative area reductions of small glaciers were usually higher than those of large ones, which exhibited larger absolute loss, indicating that the small glaciers were more sensitive to climate change than la...  相似文献   

基于越南遥感时间序列数据的湄公河三角洲土地利用及河岸变化检测研究   总被引：3，自引：0，他引：3  

阮林道  范巴赫  闵阮青  潘麦黎  蓬晃披 《资源与生态学报(英文版)》2011,(4):370-374

通过采用先进的遥感技术,基于光学和雷达时间序列卫星影像（陆地卫星,SPOT和雷达卫星）,本文对金瓯半岛（位于湄公河三角洲南部）土地覆被变化及湄公河河岸侵蚀情况进行了检测研究。鉴于金瓯半岛典型的土地覆被类型为红树林,通过对1973-2008年红树林遥感影像分析发现,近年来红树林林地面积急剧下降,超过一半的红树林已经转变为虾养殖场。与此同时,检测发现湄公河河岸已经被严重侵蚀,且侵蚀趋势正加速恶化。具体而言,田河和口河的左右两岸被认为是遭受严重侵蚀的热点区域。本文以1966-1968年地形图作为基准线数据,与1989-2009年卫星影像数据进行比照分析,此外采用数字海岸线分析系统（DSAS）模型对未来变化趋势进行了预测。  相似文献   

CO_2 CONCENTRATION AND FLUX NEAR GROUND IN MARSH OF THE SANJIANG PLAIN OF NORTHEAST CHINA     

闫敏华  马学慧  吕宪国 《中国地理科学(英文版)》1997,(1)

I.INTRODUCTIONIntherecentyears,theresearchershavepaidattentiontotheproblemsofcarbonbalanceandcarboncycleintheearthecosystem,withtheincreaseofCQZamountintheearthatmosphere.Mireisoneoftheecotypesinwhichcarbonaccumulationrateisthefastest,anditisthestrongestsinkforac(Branirgd,1980).Butthereislicitedinformationavailableaboutopconcentrationovermire.SomemeasurementsaboutthetemPOralandspatialgradientofopconcentrationhavebeenmadewithinoraboveasugarbeetcanopy(Brown,1970),corncanopy(Alien,1971;R…  相似文献   

华侨建筑形态与宗族意义场所的重构 ——陈慈黉故居的建筑地理学研究     

赵美婷  王敏 《热带地理》2016,36(2):198-207

通过文献法和访谈法对陈慈簧故居建筑形态演变进行梳理,从建筑地理学视角探析建筑演变与社会文化构建之间的互动关系与作用机制。研究发现,故居的建筑形态演变与前美村的社会文化建构间的互动关系存在耦合关联,由于在建设之初、冲突和重构3个不同时期双方作用力量有所差异,因此两者所呈现的形态与关系亦有所不同,宗族意义场所是两者的交汇点,建筑形态表现其场所意义,时代特征推动故居场所意义经历从宣示家族荣耀与权力―试图规训宗族意志―展演宗族与地方文化的重构。侨乡建筑的时空叠合的性质以及由其文化内涵所产生的场所意义是人文地理研究值得关注的对象。  相似文献   

Accuracy assessments and uncertainty analysis of spatially explicit modeling for land use/cover change and urbanization:A case in Beijing metropolitan area     

ZHANG Jie    ZHOU YinKang  LI RenQiang  ZHOU ZhaoJun  ZHANG LiQuan  SHI QingDong & PAN XiaoLing State Key Laboratory of Estuarine  Coastal Research  East China Normal University  Shanghai  China  College of Geography  Ocean Sciences  Nanjing University  Nanjing  Research Center for Ecosystem Network 《中国科学:地球科学(英文版)》2010,(2)

Spatially explicit modeling plays a vital role in land use/cover change and urbanization research as well as resources management;however,current models lack proper validation and fail to incorporate uncertainty into the formulation of model predictions.Consequently,policy makers and the general public may develop opinions based on potentially misleading research,which fails to allow for truly informed decisions.Here we use an uncertainty strategy of spatially explicit modeling combined with the series stat...  相似文献   

The fluxes and controlling factors of N_2O and CH_4 emissions from freshwater marsh in Northeast China     

YU JunBao    LIU JingShuang  SUN ZhiGao  SUN WeiDong  WANG JinDa  WANG GuoPing & CHEN XiaoBing Key Lab of Coastal Envionment Processed  Yantai Institute of Coastal Zone Research for Sustainable Development  Chinese Academy of Sciences  Yantai  China  Key Lab of Wetl  Ecology  Environment  Northeast Institute of Geography  Agricultural Ecology  Changchun  Key Laboratory of Isotope Geochronology  Geochemistry  Guangzhou Institute of Geo... 《中国科学:地球科学(英文版)》2010,(5)

Nitrous oxide (N2O) and methane (CH4) emissions were measured using a static chamber method in two adjacent plots of freshwater marsh predominated by Calamagrostis angustifolia, one is seasonal waterlogged (SW) and the other without surface water accumulation (NW), in Sanjiang Plain wetland (47°35′N, 133°31′E), northeast China, during 2002-2004. The diurnal and seasonal flux variations of both gases were significantly correlated with 5-cm-soil temperature. The NW marsh is a source of N2O and sink of CH4, wh...  相似文献   

牵手水学校 关爱生命之水     

Christoph Imboden 《地理教学》2010,(20):32-32

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Erosion, sediment transportation and accumulation in rivers   总被引：8，自引：5，他引：3  

N. I. ALEKSEEVSKIY  K. M. BERKOVICH  and R. S. CHALOV Prof.  Head of the Hydrology Department  Faculty of Geography  Moscow State University  Moscow  Russia  Prof.  Leading researcher  Lab. of Soil Erosion  Fluvial Processes  Faculty of Geography  Moscow State University  Moscow  Russia  Prof.  Head of the Lab. of Soil Erosion  Fluvial Processes  Faculty of Geography  Moscow State University  Moscow  Russia 《国际泥沙研究》2008,23(2):93-105

The present paper analyses the interrelation between erosion, sediment transportation and accumulation proposed by N. I. Makkaveyev （1908-1983） and its further development in modem studies of river channel processes in Russia. Spatio-temporal linkages between erosion and accumulation are defined considering channel processes at different scales - river longitudinal profile, channel morphological patterns, alluvial bedforms （bars, dunes） and individual sediment particles. Relations between river geomorphic activity, flow transportation capacity and sediment budgets are established （sediment input and output; channel bed erosion and sediment entrainment into flow - termination of sediment transport and its deposition）. Channel planforms, floodplain segments separated by the latter and alluvial channel bedforms are shown to be geomorphic expressions of sediment transport process at different spatial and temporal scales. This paper is dedicated to the 100th anniversary of N. I. Makkaveyev, Professor of the Moscow State University, author of the book ＂River channel and erosion in its basin＂ （1955）. That book is regarded in Russia as the pioneering work which initiated the complex hydrological and geographical studies of channel processes and laid a basis for the theory of unified fluvial erosion-accumulation process.  相似文献   

Changes of population growth in Tibet Autonomous Region     

FU Xiaofeng Institute of Geography  Chinese Academy of Sciences  Beijing  CHINA 《地理学报(英文版)》1998,(4)

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The evaluation of interregional status and development proposals of Chongqing     

XU Guanghong LU Dadao Institute of Geography  Chinese Academy of Sciences  Beijing CHINA 《地理学报(英文版)》1998,(3)

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