Environmental indicators from comparison of sporopollen in early Pleistocene lacustrine sediments from different climatic zones  

作　　者：WU FuLi FANG XiaoMin MIAO YunFa DONG Ming 

机构地区：[1]Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China [2]Key Laboratory of Western China's Environmental Systems, Ministry of Education & College of Resources and Environment, Lanzhou Univer- sity, Lanzhou 730000, China [3]The Tourism and Geography Department, Yunnan Normal University, Kunming 650092, China

出　　处：《Chinese Science Bulletin》2010年第26期2981-2988,共8页

基　　金：supported by the President Fund and Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-Q09-04);the National Natural Science Foundation of China (40871098,40920114001 and 40802041);the National Basic Research Program of China (2005CB422000)

摘　　要：Two lacustrine sporopollen records obtained from the Qaidam Basin (in the non-monsoonal region) and the Linxia Basin (in the monsoonal transition zone) indicate that during the early Pleistocene open forest-steppe/steppe vegetation developed in the Qaidam Basin, while in the Linxia Basin an open cypress forest-steppe shifted to a conifer/conifer-steppe and then to open forest-steppe vegetation. Existing sporopollen records from the Chinese Loess Plateau (CLP) (in the monsoonal region) indicate that around the Sanmen Paleolake open forest-steppe shifted to pine/conifer-broadleaved mixed forest. The conifer cover then changed to a subtropical evergreen broadleaved forest distributed around the Nihewan Paleolake. These changes suggest that wetter conditions progressed from western China to the east, and the climate became more humid than that of today indicating a stronger Asian summer monsoon during the early Pleistocene.Two lacustrine sporopollen records obtained from the Qaidam Basin （in the non-monsoonal region） and the Linxia Basin （in the monsoonal transition zone） indicate that during the early Pleistocene open forest-steppe/steppe vegetation developed in the Qaidam Basin, while in the Linxia Basin an open cypress forest-steppe shifted to a conifer/conifer-steppe and then to open forest-steppe vegetation. Existing sporopollen records from the Chinese Loess Plateau （CLP） （in the monsoonal region） indicate that around the Sanmen Paleolake open forest-steppe shifted to pine/conifer-broadleaved mixed forest. The conifer cover then changed to a subtropical evergreen broadleaved forest distributed around the Nihewan Paleolake. These changes suggest that wetter conditions progressed from western China to the east, and the climate became more humid than that of today indicating a stronger Asian summer monsoon during the early Pleistocene.

关 键 词：早更新世 孢粉记录 湖相沉积物 环境指标 气候带 亚热带常绿阔叶林 柴达木盆地 草原植被 

分 类 号：P534.631[天文地球—第四纪地质学] P532[天文地球—古生物学与地层学]