拉萨河流域浮游植物生态学研究现状

Current Status of Phytoplankton Ecology in Lhasa River Basin

拉萨河流域环境特点和物质基础决定了该流域浮游植物的群落结构特点。浮游植物是拉萨河特有经济鱼类的重要天然饵料基础,不但在能量转递和物质循环中起着重要的作用,而且是反映河流生态健康的重要指示物种之一。本文通过对拉萨河流域浮游植物的生态类型、种类组成和时空分布等方面的研究进行总结归纳,指出,拉萨河流域浮游植物群落结构整体属于硅藻,绿藻,蓝藻型水体,浮游植物丰度比较高,群落组成方面有显著的时空变化,密度随着海拔的升高而减少,而丰度随着海拔的升高而升高,物种数量在春季比较高,其次是秋季,夏季比较低。

The environmental characteristics and material basis of the Lhasa river basin determine the characteristics of phytoplankton community structure. Phytoplankton is an important natural food base for economic fish endemic to the Lhasa river. It not only plays an important role in energy transfer and material circulation,but also is one of the important indicative species reflecting the ecological health of the river.In the present paper,species composition and temporal and spatial distribution of phytoplankton in the Lhasa river basin were summarized.The phytoplankton community structure in the Lhasa river basin belongs to the diatom,green algae and cyanobacteria type water body as a whole. The abundance of phytoplankton is relatively high,and the composition of phytoplankton has significant temporal and spatial changes. Density decreases with altitude,while abundance increases with elevation. Species number is higher in spring,followed by autumn and lower in summer.