南疆博斯腾湖全新世环境演变特征的初步研究

根据南疆北部地区的博斯腾湖全世湖相沉积地层，孢粉及地化元素含量的分析结果表明，自约１２ｋａＢＰ以来，博斯腾湖地区的干旱环境特征一直存在，但期间仍有相对湿润的波动，表现为在北半球全新各次新冰期中，以旱生植物种类为主的孢粉浓度一般都呈现峰值，喜湿型的元素一般呈现相对高值，且剖面中的沉积物以泥炭发育为主，但在全新世大暖期中，暖湿的气候特征并不十分明显，博斯腾尖全新世环境的序列与北疆巴里坤湖，艾比湖及柴窝

Preliminary Study on Spore Pollen Combination and Paleoenvironmental Features of the Holocene Lacustrine Sediment,Bosten Lake

The study on spore pollen and geochemical elements of the Holocene lacustrine sediment of Bosten lake,which locates at the northern part of southern Xinjiang shows that since about 12 kabp,this area was predominated consectively by drought.But according to the sporepollen combination and density,which can reflect to a certain degree the changes of desert type vegetation cover,together with the geochemical contents and sedimentary feature,several relative humid periodes still can be divided.Another important feature is also revealed,that ia during each neoglacial epoch of the northern hemisphere,spore pollen density appeard higher,humide like geochemical contents increase,and leva developed in sediment.During the Holocene Optimum Periode,climate tended to warm dry more and more,which differentiated from the Balikun lake in northeastern Xinjiang.The Holocene environmental sequence of Bosten Lake is basically coincidence with that revealed by Balikun Lake and Aibi lake in northern Xinjiang and Lopnur in southern Xinjiang,and also with the monsoonal area in eastern China and other areas in the world,reflect that the Holocene environmental changes of the northern part of southern Xinjiang is controlled by the general regulation of global environmental development,but also has distinct regional charactristics.