新疆艾丁湖区中全新世以来孢粉记录与古环境  

POLLEN RECORDS AND PALEOENVIRONMENT SINCE MID-HOLOCENE IN THE AYDINGKOL LAKE OF XINJIANG

作　　者：赵凯华[1,2] 杨振京[2] 张芸[3] 毕志伟[2,1] 王成敏[2] 杨庆华[2] 刘林敬[2] 孔昭宸[3] 严明疆[2] 

机构地区：[1]石家庄经济学院,石家庄050031 [2]中国地质科学院水文地质环境地质研究所,正定050803 [3]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093

出　　处：《第四纪研究》2013年第3期526-535,共10页Quaternary Sciences

基　　金：国家自然科学基金面上项目(批准号:40972212和41272386);中国科学院植物研究所植被与环境变化国家重点实验室2011年青年人才项目;教育部留学回国人员科研启动基金项目;中国地质科学院水文地质环境地质研究所基本科研业务费项目(批准号:SK07009)共同资助

摘　　要：内陆干旱、半干旱封闭湖泊对气候变化的响应十分敏感,是较为理想的古环境研究场所。艾丁湖位于新疆维吾尔自治区吐鲁番盆地南部,湖面海拔-154.4m,是全国最低的洼地,故艾丁湖特殊的地理位置与独特的地质环境,使其在西北干旱区环境变化研究中有着重要的意义。取自艾丁湖湖区东北方向中全新世以来两个剖面共计88个沉积物样品,通过对该剖面进行年代测定、粒度分析与孢粉鉴定统计后,根据其孢粉组合与粒度特征,发现艾丁湖中全新世的环境演变经历了两个干-湿的变化过程,并且艾丁湖地区受西风带影响明显,即中晚全新世以来气候相对比较湿润,尤其在小冰期时期受西风带影响降水增加,从而进一步揭示了西北干旱区生态演化过程以及干旱区湖泊的演化过程。The closed lakes of inland arid and semi-arid area are very sensitive to climate change, so they are the ideal sites of paleoenvironmental research. Located about 50km southeast of Turpan City, Aydingkol Lake is the lowest low-lying land in China with at an altitude of 154.4meters below sea level. And because of its special geographical location and unique geological environment, it plays an important role in the research of the environmental change in arid region of the North Western China. Two profiles were dug in the northeast of the lake. Profile I （42°39＇17.4＂N, 89°24＇50.7＂E and -154m a.s. 1. ）, 46cm in depth, were excavated 200m from the stele of Aydingkol Lake. Profile I1 （42°40＇29.3＂N,89°25＇4＂E） , 134cm in depth,were sampled at the northeast side of the road to the stele. A total of 36 families and 36 species were identified. Four subsamples of two profiles were dated using Accelerated Mass Spectrometry（AMS）. One subsample at the depth of 41 -46cm at the bottom of Profile I was dated to 1944± 25aB. P. （2015±65cal. aB. P. ）. Three subsamples of Profile 11 （ at depths of 75 - 85cm, 105 - 110cm and 130 - 134cm）were dated. But we got only one dating age of 5099±30aB. P. （5785±45cal. aB. P. ）at the depth of 130- 134cm. According to the systemic pollen characteristics and grain size, the result show that two dry-wet climatic oscillation occurred in Mid-Holocene and there was a obvious impact by westerly flow in Aydingkol Lake region. Since the Late Holocene climate is relatively humid, especially in the period of the Little Ice Age, the enhanced Westerly system might result in more rainfall.

关 键 词：孢粉 西风带 中全新世 艾丁湖 新疆 

分 类 号：P534.632[天文地球—第四纪地质学] Q913.84[天文地球—古生物学与地层学]