西藏日土县班公错地区晚更新世晚期植物群与古气候探讨

本文通过孢粉分析及¹⁴C年龄测定,恢复西藏班公错地区晚更新世晚期的植物群。约在距今40,000—42,000年（a）期间,班公错盆地曾以半荒漠-草原-荒漠交替出现;山地上有少量乔木植物。古气候比现今湿润、气温偏高,以距今3.6—2.8 × 10⁴年（a）期间的温湿最明显。

A PRELIMINARY STUDY OF PALEOVEGETATION AND PALEOCLIMATE IN THE LATER PERIOD OF LATE PLEISTOCENE IN THE BANGONGCUO LAKE REGION OF XIZANG

The Bangongcuo Lake is situated in westera xizang at 33°40' N and 79°E approximately. The lacustrine deposit profile studied lies 30 km to the east of the Bangongcuo Lake. On the basis of the results of pollen analysis and C14 dating, the author have discussed the paleovege-tation and the paleoclimate in the later period of Late Pleistocene in the ancient lake basin. During the period 40000-24000 years B. P., the changes of pleovegetation underwent a process from semi-desert to steppe and then to desert successively. Plant here include Artemisia, Chenopodiaceae, and Ephedra. In the mountain; nesr the lake, there were a few arbors, such as Pinaceae and Betulaceae. The paleoclimate was wetter and warmer than it is at present. During the period 36000-28000 years B. P° the humidity and the temperature were relatively high. This paper has also discussed the changes of physical environment in relation to the uplift of the plateau since the later period of Late Pleistocene.