白洋淀浮游植物群落及其与环境因子的典范对应分析

Canonical correspondence analysis of phytoplankton community and its environmental factors in the Lake Baiyangdian

为掌握白洋淀浮游植物的群落特征,于2006年4月至10月间对其进行了5次采样调查,经显微镜检,共鉴定出浮游植物155种(属),浮游植物的密度范围在55.5×104-1704.8×104cells/L之间,群落组成以蓝藻、隐藻和绿藻为主.应用CANOCO4.5软件对获得的浮游植物数据和环境因子数据进行典范相关分析(CCA),作出物种与环境因子关系的二维排序图.结果表明,水体中的pH值及总磷浓度是影响这一区域物种分布格局重要因素,除此之外,生物需氧量和溶氧量也对浮游植物的分布有较大影响.CCA排序图较好的说明了浮游植物物种分布和环境因子之间的关系.

The phytoplankton community in the Lake Baiyangdian was characterized based on, five surveys were carried out from April to October in 2006. A total of 155 taxa were identified by microscope. The phytoplankton had an abundance ranging from 55.5×10^4cells/L to 1704.8×10^4cells/L The phytoplankton community was dominated by Cyanophyta, Cryptophyta and Chlorophyta. Canonical correspondence analysis （CCA） was applied to explore the relationship between phytoplankton species and environmental parameters by CANOCO 4.5. The species - environment biplots were drawn based by the result of CCA. The result showed that pH and total phosphorus were the most important factors influencing the distribution of phytoplankton species. Besides these, biochemical oxygen demand and dissolved oxygen were also important to the phytoplankton species. CCA ordination shows a slight, but significant method to understand the relationship between spatial distribution of phytoplankton community and environmental factors in lake systems.