Palynological Assemblages in the Paiku Co Basin of Tibet since Late Pleistocene and Their Paleoclimatic Significance
详细信息
- 责任者：Bian Yanming (Henan Institute of Geological Survey ; Zhengzhou 450007 ; China) ; Yu Jia
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：34(1)
- 关键词：晚更新世 ; Upper Pleistocene ; 孢粉组合 ; palynological assemblage ; 古气候 ; paleoclimate ; 西藏 ; Tibet
- 页码：p.87-94
- 图表：illus., 2 tables, 16 refs.
- 分类号：1400
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
Based on an analysis of Sporopollen assemblages of fluvial-lacustrine sediments in Paiku Co basin of Tibet since late Pleistocene,the authors divided the climate evolution into seven stages as follows:During 127-72 ka B.P,the climate was warm and humid,and broad-leaved and coniferous mixed forests constituted the main vegetation here.Between 66 ka B.P and 56 ka B.P.,the climate turned into warm and dry,and the vegetation changed into wood grassland.During 56-49 ka B.P.,the climate was characterized again by wetness and warmness and broad-leaved and coniferous mixed forest-dominated forest steppe.From 49 to 46 ka B.P.,the climate was temperate and dry,and the vegetation turned into wood grassland.Between 46 and 31 ka B.P,the basin had a cool and wet climate,and the wood grassland here was in a lower temperature environment.During 31-15 ka B.P.,the climate turned into cold,and the vegetation displayed alpine grassland.Since 11 ka B.P,the climate here has turned from warm and dry to cool and wet,and the vegetation has changed from bushveld into forest bushveld.It is thus concluded that the climate and environment in this region have experienced several evident cold-warm and dry-humid fluctuations in the general trend of gradually becoming arid.