中文摘要：

以10个AMS^14C测年为框架，利用BJH01孔438cm沉积物岩芯的粒度、烧失量以及孢粉阔叶树含量等代用指标，初步重建了泊江海子地区冰消期以来的气候和环境变化：1）11820cal．aB．P．以前，钻孔处为风成环境，流域发育荒漠或草原化荒漠，气候寒冷干燥；2）11820～11390cal．aB．P．，湖泊形成，流域植被好转，降水略增加，气候变暖湿；3）11390～75lOcal．aB．P．，湖泊维持高湖面，降水增加，区域植被演化为阔叶疏林草原，气候温暖湿润，其中10500～8500cal．aB．P．为最宜期；4）7510～6800cal．aB．P．，湖？白水位降低，区域植被退化，气候变干；5）6800～1590cal．aB．P．，气候总体波动变干，其中5000～4000cal．aB．P．为湖侵阶段，气候湿润，4000～1590cal．aB．P．为湖退阶段，气候最为干旱；6）1590cal．aB．P．以来湖泊扩张，水位升高至钻孔位置以上，流域植被为典型草原，气候与现在相当。泊江海子重建的全新世气候变化序列与区域乃至更大尺度的气候变化具有相关性，表现出早全新世湿润、中晚全新世变干的趋势，是季风系统通过海气耦合对北半球夏季日辐射增加的快速响应。

英文摘要：

High resolution Holocene climate sequences were needed in marginal monsoon area of China for that not only the area were interacted by those climate subsystems including the winter monsoon, the summer monsoon and the westerlies, but also for that controversies were still existed among those published Holocene sequences. This paper presents a high-resolution Holocene vegetation and climate reconstruction from the sediment of Bojianghaizi Lake （39°46＇- 39°48＇N, 109° 17＇-109°22＇E） , a closed lake located in the undulating plateau in the central north area of the Ordos Plateau, Inner Mongolia, China. A 438cm-long core （ BJH01, 39°47＇34.34＂N, 109°18＇31.28＂E） was drilled from the north central part of the lake and proxies including grain-size, loss on ignition （LOI） and pollen were investigated on 209 samples. The core could be lithologically divided into 5 units： Unit 1 （438- 412cm, ca. l1820cal.a B.P.） composed by green and gray sand with gravels, Unit 2（412-384cm, 11820-11390 cal.a B.P.） dominated by gray and green sand,Unit 3 （384-130cm, l1390-7510cal.a B.P.） consisted of black and gray silt,Unit 4 （130 ~ 84cm, 7510-6800cal. a B.P.） dominated with gray and green silt and Unit 5 （84 0cm, 1590cal.a B.P.） of silt. A hiatus at the depth of 84cm could be deduced by the dates above and below. On the basis of 10 valid AMS 14C dates and the proxy＇s investigations, Holocene climate sequences and lake evolution were reconstructed. That is, aeolian environment dominated and desert prevailed before l1820cal.a B.P., as inferred by the aeolian sand deposit and the lowest organic matter content and the lowest total pollen concentration. The lake came into being and the vegetation ameliorated a little since l1820cal.a B.P. as indicated by the fluvial sediment and the small rise of organic matter content and total pollen concentration. High lake level persisted and broadleaf woodland steppe prevailed between 11390cal.a B.P. and 7510cal.a B.P., as inferred by the lacustrine s