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作 者 ：陈亮;张修峰;刘正文;

期 刊 ：武汉植物学研究 2010年 28卷 4期 页码：453-459

关键词：浮游植物；群落结构；生态系统修复；惠州西湖；

Keywords:Phytoplankton, Community structure, Ecosystem restoration, Huizhou West Lake,

摘 要 ：2004年对广东惠州西湖实施了生态系统修复示范工程,示范区目前沉水植物丰富,水体常年清澈见底。通过2008年6月至2009年5月对示范区和未进行生态修复的平湖逐月进行浮游植物调查,研究了浮游植物群落对湖泊生态系统修复的响应。结果表明,与未修复的平湖相比,示范区浮游植物数量及群落结构均发生了很大变化。示范区全年浮游植物平均生物量和细胞丰度分别为0.31 mg/L和2.75×10⁶cells/L,均远低于未修复的平湖的3.27mg/L和197.46×10⁶cells/L;平湖中蓝藻在全年大部分时间占有绝对优势,一些热带富营养化水体中的代表种类(假鱼腥藻)成为优势种类;而示范区蓝藻不占优势,取而代之的是一些隐藻、硅藻和甲藻门的种类。另外,示范区浮游植物丰富度增加,年平均Margalef物种丰富度指数为3.70,显著高于平湖的2.68。因此,重建以沉水生植物为优势的生态系统是抑制浮游植物发展和改善湖泊水环境的有效途径。

Abstract:An ecosystem restoration project has been carried out in Huizhou West Lake(Guangdong province) since 2004.Submerged macrophytes now dominate the restored area,and water clarity and quality have significantly improved.We investigated the phytoplankton in both the restored area and Pinghu(un-restored area) from June 2008 to May 2009 to reveal the response of phytoplankton to ecosystem restoration of the lake.Results showed that both the community structure and the quantity of phytoplankton in the restored area changed greatly compared to the un-restored area.The annual average biomass and cell density were 0.31 mg/L and 2.75×10⁶cells/L,respectively,which was much lower than for Pinghu(3.27 mg/L and 197.46×10⁶cells/L).In Pinghu,Cyanophyta dominated for most of the year and some species,such as Pseudoanabaena sp.,became the most abundant species.Conversely,species of Cryptophyta,Chrysophytax,and Pyrrophyta dominated in the restored area.In addition,Margalef species richness index of phytoplankton in the restored area was 3.70,significantly higher than in Pinghu(2.68).The present study showed that ecosystem restoration by re-establishing macrophyte dominance is an efficient way to control the development of phytoplankton and improve the aquatic environment of lakes.

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