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

Key words: 
• Lhasa','');" href='javascript:void(0);'>Lhasa /
• Tibet','');" href='javascript:void(0);'>Tibet /
• phytolith assemblage zone /
• palaeoenvironment

Abstract: Abstract Through systematic analysis of phytolith characteristics on the quaternary section at Sangda Village in Lhasa ,Tibet , such as morphological classification, combination character, warmth indexed, 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