地理研究 ›› 2001, Vol. 20 ›› Issue (1): 91-96.doi: 10.11821/yj2001010013

• 论文 • 上一篇    下一篇

塔里木盆地南缘尼雅剖面的孢粉组合与环境

钟巍, 舒强, 熊黑钢   

  1. 新疆大学资源环境信息科学系, 乌鲁木齐 830046
  • 收稿日期:2000-06-21 修回日期:2001-01-02 出版日期:2001-02-15 发布日期:2001-02-15
  • 作者简介:钟巍(1967-),男,理学博士,教授。主要从事干旱区自然地理、地貌与环境等方向的研 究与教学工作,主持和参加国家自然科学基金、国家“八五”攀登项目等课题多项。已发 表专业学术论文60篇,主持与参加编写专著数部。E2mail:xjzhwei@xju.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(49761007);国家重点基础研究资助项目(G1999043508)

Pollen assemblages of Niya section in southern Xinjiang and paleoenvironmental evolution

ZHONG Wei, SHU Qiang, XIONG Hei gang   

  1. Department of Resource, Environment and Information Science, Xinjiang University, Urumqi 830046, China
  • Received:2000-06-21 Revised:2001-01-02 Online:2001-02-15 Published:2001-02-15

摘要:

根据尼雅剖面孢粉含量的分析,结合14C年代、δ13C和低频磁化率Xlf值的变化,探讨了位于塔克拉玛干沙漠南缘尼雅地区近4000年来的气候环境演化。结果表明,近4000年来,此地区气候持续干旱,但期间仍有几次相对湿润的波动,即在约3600aBP前后(1650BC)、2500~1900aBP(550BC~50AD)和1400~1000aBP(550~950AD)期间,生态环境湿润程度有所增加。研究还表明,干旱区孢粉分析结果对于古植被、古气候环境的恢复以及古人类活动变迁的推测可提供较为有用的信息,剖面中1.70~1.60m(100BC~50AD)孢粉组合禾本科花粉含量的峰值很可能是古人类生产活动的影响所至

关键词: 南疆, 尼雅剖面, 孢粉组合, 历史时期, 环境演化

Abstract:

Based on the pollen analyses of Niya section which is located at southern margin of the Tarim Basin, this paper probes into the paleoenvironmental evolution during historical times (since about 4 000 a BP) in this district. The paleoenvironmental information stored in pollen assemblage coincides with that revealed by other geological indices, such as the ratio of geo chemical element, low frequency susceptibility and δ13C. The results show three relative humid periodes has been identified, i.e., about 3 600 a BP (1 650 BC), 2 500~1 900 a BP (550 BC~50 AD) and 1 400~1 000 a BP (550~950 AD), although the macro background of drought consecutively existed. This paper also reflects that (1) studies of pollen assemblage of arid area provide useful information on paleoenvironmental changes; (2) the two abnormal high values of Gramineae appeared at 1 70~1 60 m (100 BC~50 AD) in this section imply intensified human agricultural activities during this period; (3) what's more interesting is this period incarnates apparent relative humidity reflected by pollen data and other indices.

Key words: southern Xinjiang, Niya section, pollen assemblage, historical times, paleoenvironmental evolution

  • P532