Stratigraphy and palaeoenvironmental implications of Pleistocene and Holocene aeolian sediments in the Lhasa area, southern Tibet (China)

ISL OpenIR > 青海盐湖研究所知识仓储

	Stratigraphy and palaeoenvironmental implications of Pleistocene and Holocene aeolian sediments in the Lhasa area, southern Tibet (China)
	Kaiser, Knut 1; Lai, Zhongping2 ; Schneider, Birgit 3; Reudenbach, Christoph 1; Miehe, Georg 1; Brueckner, Helmut 1
	2009-01-15
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷号	271 期号:3-4 页码:329-342
关键词	Loess Aeolian Sand Luminescence And Radiocarbon Dating Palaeosol Human Activity Xizang-qinghai Plateau
摘要	Along the middle and lower reaches of the Kyichu River and its tributaries (Lhasa area, southern Tibet), a multidisciplinary study was carried out in order to investigate the areal distribution, sedimentological properties, ages and palaeoenvironmental implications of aeolian deposits including intercalated palaeosols. This research was initiated to investigate to what extent southern Tibet is influenced by past human activity, as even recent evaluations perceive the present treeless desertic environment as natural. Fifteen profiles were recorded at an altitude of 3540-4580 m a.s.l. with subsequent sedimentological, geochronological (OSL, AMS (14)C) and palaeobotanical (charcoal) analyses. Sediment properties of both loesses and aeolian sands reveal an origin from aeolian sorting of nearby fluvial deposits. The calculated ages are the oldest obtained thus far on aeolian sediments from southern and interior Tibet, revealing natural aeolian sedimentation before and around the Last Glacial Maximum (c. 20 ka). However, a distinct portion of Late Holocene sandy aeolian sediments also occurs. Both the evidence for the aeolian dynamics (widespread Pleistocene loess and aeolian sand deposition, local Late Holocene aeolian sand deposition, modern reactivation of widespread Pleistocene aeolian sands) and the palaeobotanical findings (Late Holocene vegetation change from a tree-bearing to a widely treeless landscape) provide evidence that the Lhasa area was strongly influenced by human activity since at least the Late Neolithic (c. 4200 cal yrs BP). Thus the present-day desertic environment might not primarily be a result of the semiarid climate or the high-altitude conditions, but rather of activities of the humans and their collateral effects. However, once established, this semi-natural ecosystem persisted, controlled by strong grazing, firewood extraction, erosion and harsh edaphic conditions, preventing the recovery of trees. (C) 2008 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/363002/5891
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室
作者单位	1.Univ Marburg, Fac Geog, D-35032 Marburg, Germany 2.Chinese Acad Sci, Luminescence Dating Grp, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China 3.Univ Leipzig, Dept Geog, D-04103 Leipzig, Germany
推荐引用方式 GB/T 7714	Kaiser, Knut,Lai, Zhongping,Schneider, Birgit,et al. Stratigraphy and palaeoenvironmental implications of Pleistocene and Holocene aeolian sediments in the Lhasa area, southern Tibet (China)[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2009,271(3-4):329-342.
APA	Kaiser, Knut,Lai, Zhongping,Schneider, Birgit,Reudenbach, Christoph,Miehe, Georg,&Brueckner, Helmut.(2009).Stratigraphy and palaeoenvironmental implications of Pleistocene and Holocene aeolian sediments in the Lhasa area, southern Tibet (China).PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,271(3-4),329-342.
MLA	Kaiser, Knut,et al."Stratigraphy and palaeoenvironmental implications of Pleistocene and Holocene aeolian sediments in the Lhasa area, southern Tibet (China)".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 271.3-4(2009):329-342.