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《Acta Scientiarum Naturalium Universitatis Pekinensis》 2011-04
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Environmental Changes at the North of Jianghan Plain during Ming and Qing Period

ZHONG Yujia1,MO Duowen1,LI Yiyin1,SHI Chenxi1,HU Ke1,LIU Hui2 1.College of Urban and Environmental Sciences,Laboratory for Earth Surface Processes(MOE),Peking University,Beijing 100871;2.Hubei Provincial Institute of Cultural Relics and Archaeology,Wuhan,430077  
The Caidangxi profile is in the north of Jianghan Plain,Hubei Province,China.Synthetic analysis of grain size,chemical elements and pollen of sedimentary samples from Caidangxi profile reveal the paleo-environmental changes since 1250 AD of the area.The sediments of the profile dominantly consist of clay silts.The sedimentary characteristics,such as grain size and the sorting coefficient,together with the analysis geomorphic position on which the deposition occurred,may indicate that the sediments were deposited by sheet flood mainly from Han River in a slow hydrodynamic depositional process.The sedimentary characteristics also show some similarities with the loess sediments for that some materials were derived from the loess distributed in this river basin.The grain-size and sorting have a significantly increase in 1500 AD,which might reflect the effect of the intensified flooding process.The climatic history since 1250 AD could be identified four stages by geochemical elements and pollen analysis data.The climate of four stages were respectively "wet and warm","cool and dry","a little wet and warm" and "a little cool and dry".The distinct cool and dry climate during around 1500 AD might reflect the response of an evidently lower temperature event of the Little Ice Age.It also might be one of the reasons for the intensified flood process during the same time.
【Fund】: 国家科技支撑计划(2006BAK21B02);; 国家重点基础研究发展计划(2003CB415201);; 国家自然科学基金(40671016 40901012)资助
【CateGory Index】: P467
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