西藏工布自然保护区藻类植物区系及分布特点

基于对西藏工布自然保护区藻类植物的调查采集,共鉴定出189种(含变种),隶属5门,28科,50属。其中以硅藻门(Bacillariophyta)种类最多,有9科,18属,109种;绿藻门(Chlorophyta)为亚优势门类,有9科,20属,50种;蓝藻门(Cyanophyta)次之,为8科,10属,28种;红藻门(Rhodophyta)和金藻门(Chrysophyta)最少,各为1科,1属,1种。主要群落类型有7种,即颤藻群落、胶须藻群落、念珠藻群落、水树藻群落、桥弯藻群落、丝藻群落和双星藻-转板藻-水绵群落。指示藻类分析显示,目前该地区水体状况良好,基本未受到严重污染,大部分水体为β-中污带,其余部分为寡污带。该地区藻类植物的分布特点表现为高原冷水山溪急流种类典型、高山源头性种类明显但耐污种类较少。对该地区水体和藻类植物多样性保护提出了建议。

Distribution and Floristic Characteristics of Algae in the Gongbu Nature Reserve,Tibet

It was investigated the algae in the Gongbu Nature Reserve,Tibet.The results showed that 189 species(including varieties) were found.Bacillariophyta has most species,with 109 species of 18 genera in 9 families.Chlorophyta was the subdominant division,with 50 species of 20 genera in 9 families.Cyanophyta was ranked as the third dominant division,with 28 species of 10 genera in 8 families.They were belonging to 5 divisions,28 families,and 50 genera.Bacillariophyta and Chlorophyta dominated in species.Rhodophyta and Chrysophyta had the least species,with just only 1 species,which belonged to 1 family and 1 genus,respectively.There were 7 types of algal community in the Gongbu Nature Reserve,namely Oscillatoria community,Rivularia community,Nostoc community,Hydrurus foetidus community,Cymbella community,Ulothrix community,and Zygnema-Mougeotia-Spirogyna community.Water quality was evaluated by indicator algae analysis.It represented that the overall water quality was good,and the water had not been polluted seriously.Most of the waterbodies were β-mesosaprobic zones,and the others were oligosaprobic zones.The floristic characteristics in the Gongbu Nature Reserve are typical plateau cold water streams with fast flow.The species which represented the source of mountain stream could be observed obviously,and pollution-resistant algae were rarely found.This study could provide suggestion for water and algae diversity protection in this area.