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Stratigraphy and palaeoenvironmental implications of Pleistocene and Holocene aeolian sediments in the Lhasa area, southern Tibet (China)
Kaiser, Knut1; Lai, Zhongping2; Schneider, Birgit3; Reudenbach, Christoph1; Miehe, Georg1; Brueckner, Helmut1
2009-01-15
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷号271期号:3-4页码:329-342
文章类型Article
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.
关键词Loess Aeolian Sand Luminescence And Radiocarbon Dating Palaeosol Human Activity Xizang-qinghai Plateau
WOS标题词Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine
关键词[WOS]SOIL ORGANIC-MATTER ; LOESS PLATEAU ; ENVIRONMENTAL-CHANGES ; PALEOSOL CLASSIFICATION ; INNER-MONGOLIA ; NORTHERN CHINA ; QILIAN SHAN ; QUATERNARY ; QINGHAI ; EVOLUTION
收录类别SCI
语种英语
WOS研究方向Physical Geography ; Geology ; Paleontology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号WOS:000263013200013
引用统计
被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
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
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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.
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