%0 Journal Article
%T Ostracodes Assemblages and Their Environmental Significance from Lake Core of Nam Co, Tibetan Plateau<br>8.4 ka 以来纳木错湖芯介形类组合的环境变化意义
%A ACHWALB
%A XIE Manping
%A ZHU Liping
%A PENG Ping
%A ZHEN Xiaolin
%A WANG Yong
%A JU Jianting
%A ACHWALB
%A <br>谢曼平
%A 朱立平
%A 彭萍
%A 甄晓林
%A 汪勇
%A 鞠建廷
%A A. CHWALB
%J 地理学报
%D 2008
%I 
%X A 332-cm long lacustrine core was drilled in the middle south of Tibentan Plateau.From the core,15 species of ostracodes belonging to 6 genera have been identified.According to the changes of the ostracodes assemblage and the ostracodes ecological characters,which are sensitive to the changed of environment,three stages can be distinguished as follows:The early stage was from 8400 to 6800 aBP,during which the temperature descended in fluctuation which matched with the unstable cooling event of earlier Holocene,the climate was cold-humid,and the lake depth changed from shallow to deep.The middle stage was from 6400 to 2500 aBP,during which the climate changed from warm-humid to cold-humid and then became cold-dry,and the lake depth was becoming deep step by step.Weather pattern shifting during this period,from wet-cold to dry-cold,had been modifying and finally built up modern environments in Nam Co.The late stage(2500 aBP-present) showed a trait of lake depth increasing.At the earlier time of this stage,the climate was still cold-dry,which had the same trend of the end of the middle stage,however,the salinity of the lake increased;at the later time of this stage,the climate showed a general tendency toward cold-dry,as well as the hydrological condition of surface flowing water became faint.The concurrence of black shells percentage and the biggest ostracodes content,as well as the increasing of sedimentary hydrodynamic condition,indicated a post-mortem reworking.The abundance of Candona juvenile shells reflected juvenile mortality as a result of the rapid onset of unfavorable conditions such as catastrophic hydrological condition change.
%K Tibetan Plateau
%K Nam Co
%K ostracodes
%K environmental change
%K lacustrine core<br>青藏高原
%K 纳木错
%K 介形类
%K 环境变化
%K 湖芯
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=869B153A4C6B5B85&jid=F7B5B947C24B9D649491012214E4BEF4&aid=06FD29C72D7342E0D8DA850FE905FD20&yid=67289AFF6305E306&vid=E84BBBDDD74F497C&iid=9CF7A0430CBB2DFD&sid=90EAFEE49150CFCD&eid=ABE2D40B2765724E&journal_id=0375-5444&journal_name=地理学报&referenced_num=1&reference_num=91