西藏扎布耶盐湖地区现代花粉雨的初步研究

从扎布耶盐湖和藏南地区采集的２１块表土花粉分析结果，提供了花粉与植被，花粉与亚环境之间的定性关系，在扎耶盐湖，ａ泉水沼泽，以莎草科花粉占优势。ｂ．盐盘，藜科和麻黄属花粉含量高。ｃ．山坡，分布变色锦鸡儿灌丛，表土花粉以蒿属和藜科为优势。ｄ．河流沙滩，以蒿属和禾本科花粉为主，ｅ．常年盐湖，以蒿属占优势，松属、云杉属、冷杉属、铁杉属、桦属和桤木属等乔木植物花表土中普遍存在。以松粉百分含量最高（平均２６．

A PRELIMINARY STUDY ON MODERN POLLEN RAIN OF ZABUYE SALT LAKE AREA,XIZANG

Pollen analysis of 21 surface samples collected from the Zabuye Salt Lake area and Southern Xizang Plateau provided infoimation about the quanlitative relations between pollen content and vegetation,and pollen with subenvironment. In Zabbuye Salt Lake area,a. Samples from spring and swamp were dominated by pollen of Cyperaceae,b. Pollen percentage of Chcnopodiaceae and Ephedra were high in salt pen.c. On hillslope were distributed by Caragana versicales shrub,the surface samples were dominated by pollen of Artemisia and Chenopodiaceae.d.Samples from river and sandflat were mainly composed of Artemisia and Gramineae.e. In Zabuye perennial saline lake were dominated by pollen of Artemisia. The tree pollen of Pinus,Picea,Abies,Tsuga,Betula and Alnus were common in surface sample, and pollen percentage of Pinus were highest(26.5 % in average).As compared with 8 surface sample pollen analysis of Southern Xizang Plateau,vegetational variations between the steppe and forest are evident in the modern pollen rain. The atmospheric circulation is the main factor affecting the distribution of Pinus in Xizang Plateau.