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Kaiser, Knut; Miehe, Georg; Schoch, Werner H; Zander, Anja; Schlütz, Frank (2006): Pedogeomorphology, geochronology and paleobotany of soil profiles obtained in the Kyichu River catchment, sourthern Tibet [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.787121, Supplement to: Kaiser, K et al. (2006): Relief, soil and lost forest: Late Holocene environmental changes in southern Tibet under human impact. Zeitschrift für Geomorphologie, Suppl. 142, 149-173

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Abstract:
Results of pedogeomorphological, geochronological and paleobotanical investigations are presented covering the last ca. 4,000 years. The study sites are located in the heavily degraded Kyichu River catchment around Lhasa at 3,600-4,600 m a.s.l. Repeatedly, colluvial sediments have been recorded overlying paleosols. These deposits can be divided into i) coarse-grained sediments with a high proportion of stones and boulders originating from alluvial fans and debris flows, ii) matrix supported sediments with some stones and boulders originating from mudflows or combined colluvial processes such as hillwash plus rock fall, and iii) fine-grained sediments originating from hill wash. The IRSL multi-level dating of profile QUG 1 points to a short-time colluvial sedimentation between 1.0 ± 0.1 and 0.8 ± 0.1 ka. In contrast, dated paleosols of profile GAR 1 (7,908 ± 99 and 3,668 ± 57 BP) encompass a first colluvial episode. Here, the upper colluvial sedimentation took place during several periods between 2.6 ± 0.3 and 0.4 ± 0.1 ka. For the first time in Tibet, a systematic extraction, determination and dating of charcoals from buried paleosols was conducted. The charcoals confirm the Late Holocene presence of juniper forests or woodlands in a now treeless, barren environment. A pollen diagram from Lhasa shows a distinct decline of pollen of the Jumperus-type around 4,140 ± 50 BP, which is interpreted as indicating a clearing of forests on the adjacent slopes. It is assumed that the environmental changes from forests to desertic rangelands since ca. 4,000 BP have been at least reinforced by humans.
Coverage:
Median Latitude: 29.711488 * Median Longitude: 90.969859 * South-bound Latitude: 29.666700 * West-bound Longitude: 90.830360 * North-bound Latitude: 29.740420 * East-bound Longitude: 91.128390
Date/Time Start: 2002-01-01T00:00:00 * Date/Time End: 2003-01-01T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Kaiser, K; Miehe, G; Schoch, WH et al. (2006): (Table 2) AMS radiocarbon datings and calibrated ages of soil profiles obtained in the Kyichu River catchment. https://doi.org/10.1594/PANGAEA.787120
  2. Kaiser, K; Miehe, G; Schoch, WH et al. (2006): (Table 3) Dose rates, uranium and thorium content, and IRSL ages of soil profiles obtained in the Kyichu River catchment. https://doi.org/10.1594/PANGAEA.787118
  3. Kaiser, K; Miehe, G; Schoch, WH et al. (2006): (Table 4) Charcoal determinations of soil profiles obtained in the Kyichu River catchment. https://doi.org/10.1594/PANGAEA.787119
  4. Kaiser, K; Miehe, G; Schoch, WH et al. (2006): (Table 1) Granulometry, soil pH, carbonate content and color description of soil profiles obtained in the Kyichu River catchment. https://doi.org/10.1594/PANGAEA.787116