寒区典型湿地浮游植物功能群季节变化及其与环境因子关系

安邦河湿地是一个典型的寒区湿地,本文运用功能群的方法对其浮游植物季节变化进行研究,并运用多元分析方法分析其与环境因子的关系.安邦河湿地共有浮游植物种8门104种,划分为14个功能群,分别是C、D、E、F、H1、J、Lo、M、MP、N、P、SN、X1和Y.其中重要功能群是C、D、E、J、Lo、N、P和Y.浮游植物的功能群组成季节变化明显,春季以功能群E和Lo生物量所占比例最大,分别为27.45%和20.49%;夏季以功能群D、J、P占优,为28.59%、18.53%和19.47%;秋季以功能群J、P为主,占39.65%和13.34%.可见,安邦河湿地浮游植物功能群的季节变化呈现为E+Lo→D+J+P→J+P的特点,反映了水环境特征:春季低水温低营养盐、夏季高水温高营养盐且水体混浊、秋季水温和营养盐均较高.运用冗余分析(RDA)分析浮游植物功能群与环境因子之间的关系,结果显示水温(WT)、无机氮(DIN)和溶解性磷酸盐(SRP)是安邦河湿地浮游植物功能群季节变化的主要环境因子.

Seasonal variation of phytoplankton functional groups and their relationship with environmental factors in a typical cold regions wetland

Anbanghe wetland is a typical swamp in the cold region. In this study, the concept of functional group was firstly applied to study seasonal variation of phytoplankton community of Anbanghe Wetland. The distribution of phytoplankton functional groups and their relationship with environmental factors were investigated by multivariate analysis techniques. A total of 104 taxa were recorded. There were 14 functional groups, including C, D, E, F, H1, J, Lo, M, MP, N, P, S_N, X1 and Y, found during the study periods. Groups C, D, E, J, Lo, N, P and Y were the dominant group. The phytoplankton functional groups exhibited a noticeably seasonal variation. Group E and Lo were predominant in the spring associated with low water temperature (WT) and nutrients availability. Group D, J and P were associated with high WT, nutrients availability and turbidity in the summer. Group J and P were associated with high WT and nutrients availability in the autumn. The redundancy analysis (RDA) showed that WT, dissolved inorganic nitrogen (DIN), and soluble reactive phosphorus (SRP) were the key environmental factors which impacted the seasonal variation of phytoplankton functional groups in Anbanghe Wetland.