塔克拉玛干沙漠北部全新世环境演变(Ⅱ)

An Evolution of Holocene Environment in the North of Taklimakan Deesert

全新世以来塔克拉玛干北部（以下简称塔干北）主要沉积物组成为亚粘质土、细砂夹杂着粉砂。分析该区域沉积物的分层结构和粒度组成、化学元素、孢粉、碳酸钙、矿物表明：区域气候以干燥为主，并存在着高温与冷凉的温度波动，且气候的这种变化与全球气候的变化紧密相关。塔干北气候变化受全球径向环流影响较大，纬向环流影响较小。

The main sediments of Holocene sections are clay and sand soil with mini sand layers in North Taklimakan desert.The evolution of Holocence environment in the North of Taklimakan desert is revealed by analyzing the characteristics of granular,change of chemical composition,sporopollen composition,content of CaCO_3 and mineral.The Holocene climate is arid and changes between hot dry and cool dry,which is mainly controlled by global longitude wind and cyclone.The region climate change,comparing with global climate change,and the climate gradually become arid and the environment become more deterorated with the global climate become drier in recent years.