阳澄西湖浮游藻类功能群演替特征及其与环境因子的关系

Succession patterns of phytoplankton functional groups in western area of Yangcheng Lake and their relationship with environmental factors

采用浮游藻类功能群、RDA(冗余分析)、多元回归分析等方法,对阳澄西湖浮游藻类功能群的演替特征及其影响因子进行了研究.2015年3月~2016年2月逐月对阳澄西湖浮游藻类和环境因子进行调查分析,结果表明,阳澄西湖浮游藻类可划分为21个功能群,其中10个功能群(B、D、E、G、J、Lo、S1、X1、X2、Y)为该湖的优势功能群,反映的生境特征表明该湖为分层敏感,扰动较少且混合程度较高的中-富营养浅水水体.阳澄西湖不同季节优势功能群演替规律为:由春季的B+X2+Y+X1+J+D,经夏季的B+X2+Y+X1+J+G+S1+Lo+E和秋季的B+X2+Y+Lo+E,转变为B+X2+Y+X1+D.RDA分析结果显示,阳澄西湖浮游藻类功能群分布受环境影响较为明显,但不同季节影响因子不同.整体上,水温(T)、pH值、溶解氧(DO)、氨氮(NH 4+-N)和浊度(Tur)是影响阳澄西湖浮游藻类功能群分布格局的主要因素.

The functional classification of phytoplankton assemblages in western area of Yangcheng Lake and the influencing factors were explored based upon their community composition structure analysis and by using the redundancy analysis and multiple regression methods.Samples were collected monthly from March 2015 to February 2016 from 12 sites distributed in western area of Yangcheng Lake,and the phytoplankton and environmental variables were investigated.A total of 21 phytoplankton functional groups were identified as A、B、D、E、F、G、H1、J、Lo、M、MP、P、S1、T、TD、W1、W2、X1、X2、X3 and Y.And they were dominated by the 10groups of B、D、E、G、J、Lo、S1、X1、X2 and Y.The western water of Yangcheng Lake was a shallow medium-eutrophic water body with less disturbance and high mixing degree.Meanwhile,the dominant functional groups of phytoplankton in western area of Yangcheng Lake followed the seasonal succession pattern,that was B+X2+Y+X1+J+D in spring,B+X2+Y+X1+J+G+S1+Lo+E in summer,B+X2+Y+Lo+E in autumn and B+X2+Y+X1+D in winter.As well,the distribution of these functional groups in west area of Yangcheng Lake was closely related to the environmental variables.Water temperature,pH,DO,ammonia,and turbidity were the main influencing factors.