珠江口广州段浮游植物群落特征研究

Study on characteristics of phytoplankton community in Guangzhou segment of the Pearl River Estuary

2008～2010年对珠江口广州段浮游植物进行了12个航次现场调查,共鉴定出浮游植物185种。中肋骨条藻(Skeletonemacostatum)和颗粒直链藻(Melosira granulate)及其最窄变种(Melosira granulate v.angustissima)为主要优势种,并有明显的季节演替现象。调查期间,珠江口广州段浮游植物细胞数的平均值为5.51×105cells/L,且浮游植物细胞数量存在年间变化。通过比较各年的Shannon-Wiener多样性指数和Pielou均匀度年均值,结果表明,2010年的生态环境较2008年和2009年好,浮游植物群落结构较稳定。经相关性分析,磷酸盐为调查河口区浮游植物生长繁殖主要影响因子。

Twelve cruises of phytoplankton survey were made in Guangzhou segment of the Pearl River estuary in 2008-2010. And 185 species of phytoplankton were indentified during the survey period. The dominant species were Skeletonema costatum and Melosira granulate ＆ Melosira granulate v. angustissima, and they changed with an obvious seasonal succession. During the survey period, the average cell number of phytoplankton in Guangzhou segment of the Pearl River estuary was 5.51 × 10^5 cells/L, and there were variation ranges among the yearly mean cell number. Through comparing the yearly mean Shannon-Wiener biodiversity index and Pielou evenness index of 2008, 2009 and 2010, it was concluded that the eco-environment quality in 2010 was better than it in 2008 and 2009, and the phytoplankton community structure was more stable. After correlation analyzing, the result showed that the concentration of PO43-P was the main influence factors of the growth of phytoplankton in the survey estuary.