%0 Journal Article
%T ENVIRONMENTAL CHANGES RECORDED IN CORE SEDIMENTS FROM THE PUMOYUM CO LAKE OF THE TIBETAN PLATEAU DURING THE INITIAL STAGE OF THE LAST DEGLACIAL PERIOD<br>湖芯沉积物揭示的末次冰消开始时期 普莫雍错湖区环境变化*
%A Zhu Liping
%A Ju Jianting
%A Wang Junbo
%A NMitsugu
%A MYoshimune
%A Wu Yanhong
%A Feng Jinliang
%A Xie Manping
%A Lin Xiao
%A <br>朱立平
%A 鞠建廷
%A 王君波
%A 西村弥亚
%A 守田益宗
%A 吴艳红
%A 冯金良
%A 谢曼平
%A 林晓
%J 第四纪研究
%D 2006
%I 
%X This paper revealed a warm and humid environment during the initial stage of the last deglacial period in the Pumoyum Co Lake of the southern Tibet and analyzed several possible reasons. Investigation of lake hydrological conditions has indicated that there were many glaciers, of which the melting water constituted significant supply for the lake. Variations of lake water level and lake sedimentary environment have close relationship with the glacier melting water and the temperature changing background. By using HD-27 single frequency echo-sounder and HD8500 GPS receiver, the isobath of the lake were surveyed and sedimentary transportation processes were analyzed. In 2001, the authors drilled a PISTON core (PM-1) at 46.5m water depth site in the east part of the lake, which was far away from terrestrial sediments source. 4 AMS 14 C dating data, 12922±49aB.P. , 13435±48aB.P. , 14642±49aB.P. , and 14819±50aB.P. were obtained from vegetation debris at the depths of 212cm, 300cm, 370cm, and 380cm in the lower part of the core and the ages were also calibrated as 15410±250aB.P. , 16430±240aB.P. , 17550±270aB.P. , and 17740±280aB.P. by CALIB 3.0. Environmental proxies of grain size, trace elements, CaCO3, Total Organic Carbon (TOC), C/N, δ13Corg. , biomarkers as well as pollen and spores were analyzed. During 16.4~15.4 cal.kaB.P. , increased grain-size implied that there were more "coarse" particles transported into the lake due to surface inflow enhancing. CaCO3 and Fe/Mn data indicated that the lake water volume was enlarged and lake water level increased. No matter where (the internal or external) TOC source was from, the increased TOC in lake sediments suggested that the temperature rising resulted in lake zooplankton or terrestrial vegetation development. However, C/N and biomarkers of HMFA and HMA showed that more terrestrial organic materials were deposited in the sediments. On the one hand, it was an evidence for a developed terrestrial vegetation, while on the other hand the terrestrial vegetation debris were more easily transported into the lake due to more surface water inflow. Pollen and spore assemblages in this section also suggested that, humid-adaptive vegetations (Gramineae and Cyperaceae) developed while dry-adaptive vegetation (Chenopodiaceae) decreased. The lake enlargement and terrestrial vegetations development were due to plenty of glacier melting water supply and a warmer and more humid climate after the end of the Last Glacial Maximum (LGM).
%K Tibetan Plateau
%K Pumoyum Co Lake
%K lake sediments
%K environmental change
%K deglacial period<br>青藏高原
%K 普莫雍错湖
%K 湖泊沉积
%K 环境变化
%K 冰消期
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=485D9413C8C180C3&yid=37904DC365DD7266&vid=96C778EE049EE47D&iid=94C357A881DFC066&sid=FAC9AF09A23B46DD&eid=5E191A234CD3698F&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=34&reference_num=65