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Characteristics of Phytolith Assemblages from Sediments of Modern River Floodplain and First Terraces in Lhasa River,Tibet

CHEN Ling-kang 1 GUO Jian-qiu2 GU Yan-sheng3(1.Faculty of Earth Science,China University of Geosciences,Wuhan 430074;2.School of Computer,China University of Geosciences,Wuhan 430074;3.Colledge of Environment,China University of Geosciences,Wuhan 430074)  
Through systematic analysis of phytolith characteristics on the Quaternary section at Sangda Village in Lhasa,Tibet,such as morphological classification,combination character,warmth index,five assemblage zones can be distinguished as follows: the first combination of tooth model-smooth bar model,chip model,muri block,reflecting a warm-cool climate;the second,rectangular model-smooth bar model and polyhedron model,reflecting the warmer climate;the third,rectangular model,tooth model-smooth and bar model,reflecting a drought climate;the fourth,rectangular model-dumbbell model,tooth model-smooth bar model and polyhedron model,indicating warm and damp climate;and the fifth,tooth model,cap model-smooth bar model,polyhedron model and chip mode,indicating a colder climate.The study of morphological classification and combination could be applied for probing into palaeoenvironment and paleo-vegetations of Quaternary in the Sangda village,Lhasa area.
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