A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau

ISL OpenIR > 青海盐湖研究所知识仓储

	A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau
	Wei, Haicheng1 ; Fan, Qishun1 ; Zhao, Yan 2; Ma, Haizhou1 ; Shan, Fashou1 ; An, Fuyuan1 ; Yuan, Qin1
	2015-08-01
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷号	431 页码:43-52
关键词	Pollen Record Climate Change Qaidam Basin Late Pleistocene Tibetan Plateau (Tp)
摘要	Drill core (ISL1A) was obtained from the Qarhan Salt Lake in central eastern Qaidam Basin, northeastern Tibetan Plateau (NE TP). Fossil pollen and the lithology of the core sediment were analyzed in conjunction with AMS C-14 and Th-230 dating. The results indicated that Artemisia and Chenopodiaceae dominated the steppe/desert steppe vegetation developed around the lake between 94 and 51.2 ka, corresponding with the organic-rich silty clay deposited in the core sediments. Pediastrum continuously appeared in the core sediments between 94 and 51.2 ka, indicating freshwater to oligohaline conditions of the paleo-Qarhan Lake during the late marine isotope stage (MIS) 5, MIS 4, and early MIS 3. During the 51.2 to 32.5 ka period, Ephedra dominated shrub-desert vegetation expanded in the basin, while, Pediastrum disappeared in the core sediments. The core sediments consisted of interbedded layers of halite silt and clay-rich halite between 51.2 and 32.5 ka, signifying a shift toward drier hydrologic conditions. Thus, the paleo-Qarhan Lake experienced periods of desiccation and shallow water levels. Artemisia and Chenopodiaceae dominated steppe/desert steppe vegetation appeared again from 32.5 to 253 ka, with clay-rich sediments in the core, thereby suggesting an increase of runoff from the lake under relatively wetter climatic conditions. Since 253 ka, however, pollen concentrations declined, corresponding with the amount of halite deposited in the core sediment and, suggesting a cold, dry climatic condition during MIS2. Our findings have important implications for understanding complex regional vegetation and climatic responses to large-scale forcings in the Qaidam Basin. (C) 2015 Elsevier B.V. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6145
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室支撑部门
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Wei, Haicheng,Fan, Qishun,Zhao, Yan,et al. A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2015,431:43-52.
APA	Wei, Haicheng.,Fan, Qishun.,Zhao, Yan.,Ma, Haizhou.,Shan, Fashou.,...&Yuan, Qin.(2015).A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,431,43-52.
MLA	Wei, Haicheng,et al."A 94-10 ka pollen record of vegetation change in Qaidam Basin, northeastern Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 431(2015):43-52.