| 摘要: |
| 为查明长湖浮游植物功能群特征及其与环境因子的关系，于2015年4月至2016年1月开展了四个季度的调查分析，并运用冗余分析法（redundancy analysis，RDA）分析了浮游植物优势功能群与环境因子的关系。结果显示：本次调查共鉴定出26个浮游植物功能群，其中富营养化水体代表性功能群13个，优势功能群16个，其中功能群B、D、J、Lo、MP、W1和X1（表1）为四季共有优势功能群。优势功能群的丰度和生物量均为夏季最高，春季其次。以最大相对丰度超过50%为评价指标，优势功能群的季节演替规律为X1/X2/B（春）→X1（夏）→MP/X1/B（秋）→D/X1（冬），其中典型浅水富营养化水体代表功能群X1的最大相对丰度和出现率均较高。冗余分析（RDA）表明，富营养化水体代表性功能群F、K、Lo、Lr、W1和X2在不同季节与总氮（TN）、磷酸盐（PO43--P）、溶解氧（DO）以及水温（WT）表现出不同程度的正相关性，水温（WT）和透明度（WD）是春季的主要环境限制因子，冬季X1、D和J这三个优势功能群与各环境因子的相关性都很低。本次研究表明长湖整体处于中度富营养-富营养化状态，局部水域达到重度富营养化，这与运用其他指示生物对长湖的水质评价结果基本一致。 |
| 关键词: 浮游植物 优势功能群 环境因子 冗余分析 长湖 |
| DOI：10.11693/hyhz20190700150 |
| 分类号:X524 |
| 基金项目:国家科技支撑计划"十二五"项目，2012BAD25B08-03号；湿地中心（长江大学湿地生态与农业利用教育部工程研究中心开放基金，KF2018111号，KF201809号。 |
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| RELATIONSHIP BETWEEN CHARACTERISTICS OF PHYTOPLANKTON FUNCTIONAL GROUPS AND THEIR ENVIRONMENTAL FACTORS IN CHANGHU LAKE |
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QI Mei1, WU Jia-Wei1,2, GONG Sen-Sen1,2,3,4, CHAI Yi1,2, LUO Jing-Bo1, TAN Feng-Xia1,2, YANG Jun2, YANG De-Guo3,4, HE Yong-Feng3,4
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1.College of Animal Science, Changjiang University, Jingzhou 434025, China;2.Engineering Research Center of Wetland Ecology and Agricultural Utilization, Ministry of Education, Changjiang University, Jingzhou 434025, China;3.Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences;4.Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan 430223, China
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| Abstract: |
| To study the characteristics of phytoplankton functional groups and their relationship with environmental factors in Changhu Lake, Hubei, China, seasonal investigation and analysis were carried out from April 2015 to January 2016. The relationship between phytoplankton dominant functional groups and environmental factors was analyzed by redundancy analysis (RDA). A total of 26 phytoplankton functional groups were identified, of which 13 were representative ones in eutrophic water and 16 were dominant functional groups. In addition, functional groups of B, D, J, Lo, MP, W1 and X1 (Tab.1) were common dominant function groups in the four seasons. Both the abundance and biomass of dominant functional groups were the highest in summer, followed by spring. The maximum relative abundance over 50% was taken as the evaluation index; and the seasonal succession of dominant functional groups was X1/X2/B (spring)→X1 (summer)→MP/X1/B (autumn)→D/X1(winter). The maximum relative abundance and rate of occurrence of X1, which represented the function of eutrophic water, were both higher than the others. Redundancy analysis (RDA) showed that there were different positive correlations among the functional groups of F, K, Lo, Lr, W1 and X2, and they were representative ones in eutrophic water, with the environment factors of total nitrogen (TN), phosphate (PO43--P), dissolved oxygen (DO) and water temperature (WT) in different seasons. Both water temperature (WT) and water transparency (WD) were the major limiting factors in spring. The correlation between functional groups of X1, D, J and environmental factors was lower in winter. This study shows that the whole lake was in a state of moderate eutrophication-eutrophication, while some water areas were in serious eutrophic state, which is largely consistent with the evaluation results of water quality by using other indicators organisms in Changhu Lake. |
| Key words: phytoplankton dominant function group environmental factors redundancy analysis Changhu lake |
