【摘要】 报道了1996年10月～1997年7月和2003年对香溪河流域浮游植物2周年的调查结果。数据显示,香溪河流域的浮游植物主要由硅藻、绿藻和蓝藻组成。1996～1997年硅藻的种类最多,绿藻次之,蓝藻居第3位;2003年绿藻的种类数跃居首位,硅藻次之,其它藻类亦有不同程度的变化。藻类的细胞密度表现出明显的季节变化,最高、最低值分别出现在夏季和冬季。应用Margalef多样性指数和Menkinick多样性指数对香溪河流域的水质进行评价的结果显示:2003年该流域的水质营养等级为中-富营养型,水环境质量较6年前有所下降。更多还原

【Abstract】 This paper represents the results of an investigation on phytoplankton and water quality in Xiangxi River Watershed during the period from October 1996 to July 1997 and 2003.The results showed that the composition of phytoplankton was dominated by the species of diatoms,green algae and blue-green algae.Diatoms were the most important component,followed by green algae and blue green algae in the period of 1996-1997.In 2003,green algae sat at the primary position,and diatoms were the second.Other algae had also varied in different degree.The cell densities of phytoplankton were changed seasonally.The maximum value and the minimum value were noted in summer and winter,respectively.The water quality of Xiangxi River Watershed had a little destroyed during 6 years.The trophic status of the watershed is at α-β-mesotrophy level,nowadays.更多还原