中文摘要：

利用浙江省瓶窑北湖 BHQ孔长约14m的岩心，以4个AMS14C数据为年代依据，对49块样品进行孢粉分析。分析结果发现，样品中孢粉浓度差异较大，植物种类繁多，总计103个科/属。通过对孢粉组合特征的分析，结合岩性特征，划分出3个孢粉带和9个亚带，重建了研究区早-中全新世植被演替和气候冷暖波动的环境序列。19～8.9m沉积时段，对应于早全新世气候回暖期，研究区植被主要是以落叶栎、松、阿丁枫和枫杨为主，混有少量常绿栎和榆等的针叶-落叶阔叶混交林，常绿乔木花粉含量较低，说明研究区经历晚更新世晚期新仙女木事件后进入全新世，气候迅速转暖；8.9～6.7m 沉积时段，对应于全新世最适宜期，为研究区水热条件配置最佳阶段，主要发育由落叶栎、常绿栎、松、阿丁枫、枫杨和榆等组成的常绿-落叶阔叶混交林，常绿乔木的种类和含量要远远高于前一阶段，指示气候变化的最适宜阶段；6.7～4.775m沉积时段，对应于中全新世气候波动期，孢粉组合发生明显波动，研究区植被主要以落叶栎、枫香、松、枫杨等落叶阔叶乔木为主，常绿栎花粉的含量急剧萎缩，表明研究区植被类型演替为落叶阔叶林，反映经历了较为剧烈的气候恶化事件，而本段高含量的稻属花粉（≥35μm）可能指示该时段研究区存在一定规模的古人类活动。

英文摘要：

This research was based on a 1 4 m long core from the Borehole BHQ in Beihu Lake, Pingyao area of Zhejiang Province.With 4 dating data by AMS 14C method,palynological analysis was per-formed on 49 samples.It showed that the palynological concentrations varied greatly in different samples, and there were a wide variety of plants,i.e.,totally 1 03 pollen types were recorded.Based on characteris-tics of palynological assemblages and lithology,3 pollen zones and 9 pollen subzones were divided,and the environmental sequence of vegetation succession and climatic temperature change in the Early and Mid-dle Holocene for the study area was reconstructed.In the interval of 1 9-8.9 m,corresponding to the Early＇nbsp;Holocene,vegetation in the study area was mainly conifer-deciduous broad-leaved forest,including Quer-cus （deciduous）,Pinus,Altingiaceae and Pterocarya as well as Quercus （evergreen）,Ulmus,etc. There were low content of evergreen trees,indicating that after the “Younger Dryas Event”at the late pe-riod of Late Pleistocene,the study area entered into the Holocene,and climate quickly turned warm.In the interval of 8.9~6.7m,corresponding to the Megathermal,this was the best period of hydrothermal condition in all sections.At this period,evergreen and deciduous broad-leaved mixed forest were domi-nant,including Quercus （deciduous）,Quercus （evergreen）,Pinus,Altingiaceae,Pterocarya and Ul-mus.And the species and quantity of evergreen trees were far more than that of the former period,indica-ting warm and humid climate.During the 6.7-.775m sedimentary period,corresponding to the Middle Holocene,there was an apparent fluctuation in palynological assemblages,and the vegetation in the study area mainly contained deciduous broad-leaved forest such as Quercus （deciduous）,Altingiaceae,Pinus and Pterocarya.The number of Quercus （evergreen） dwindled rapidly.It showed that the vegetation type in the study area had evolved into deciduous and broad-leaved forests.It reflected that the area experi