摘要
浮游植物作为水体的重要初级生产者,其功能群特征在维持水生态系统稳定性方面发挥着关键作用。为揭示超大型城市河网浮游植物功能群特征和构建机制,明确影响其变化的关键因子,选取上海19条代表性中小河道,对40个位点的浮游植物功能群特征以及环境因子开展了调查。结果表明,本研究共鉴定出浮游植物8门175种,可划分为23个功能类群,其中B、D、J、MP、P、S1、X1、X2、X3、Y为优势功能群。聚类分析发现,中小河道40个采样点可划分为低营养盐(G1)和高营养盐(G2)两个特征组,两个特征组在ShannonWiener指数、Margalef指数、功能群群落组成以及环境因子方面,均存在显著差异(P<0.05)。群落距离衰减曲线分析以及校正随机率(Modified stochasticity ratio,MST)分析显示,上海河道浮游植物功能群的构建受到环境过滤和空间扩散限制两种因素的共同作用,且随机性过程占主导;G1组群落构建主要受环境过滤作用影响,而更高营养的G2组则主要受空间扩散作用影响。差异性分析和多元回归分析表明,水体总氮、亚硝氮、总磷、电导率和溶解氧是影响上海河道浮游植物功能群结构的主要环境因子。本研究为深入了解超大型城市河网水体生物多样性和生态功能维持机制,以及城市河网水生态系统保护提供基础资料。
Phytoplankton is an important primary producer of water,and its functional group characteristics play an important role in maintaining the stability of aquatic ecosystems.In order to reveal the characteristics and construction mechanism of phytoplankton functional group community and its driving factors in river networks of megacity,19 representative small and medium-sized rivers in Shanghai were selected to investigate the characteristics of phytoplankton functional groups and environmental factors at 40 sites.The results showed that a total of 175 species of phytoplankton in 8 phyla were identified,which could be divided into 23 functional groups,and B,D,J,MP,P,S1,X1,X2,X3 and Y were the dominant functional groups.The results of cluster analysis showed that 40 sampling sites could be divided into two characteristic groups:low nutrient(G1)and high nutrient(G2).There were significant differences in Shannon-Wiener diversity index,Margalef index,phytoplankton functional group community structure and environmental factors between the two groups(P<0.05).The modified stochasticity ratio(MST)and the decay relationship analysis showed that the community construction of phytoplankton functional groups in Shanghai River was affected by the environmental filtering and spatial diffusion limitation,and the stochastic process was dominant.The community construction of the low nutrient group(G1)was affected by environmental filtration,while the spatial diffusion affected the construction of phytoplankton functional groups in the higher nutrient group(G2).Difference analysis and multiple regression analysis showed that total nitrogen,nitrite nitrogen,total phosphorus,conductivity and dissolved oxygen were the main environmental factors affecting the community structure of phytoplankton functional groups in Shanghai River.This study provides new information for in-depth understanding of the biodiversity and ecological function maintenance mechanism of river networks in megacities,as well as the protection of water ecosystems in urban river networks.
作者
邢雅微
卢智灵
王婷
徐肖莹
王丽卿
张玮
XING Yawei;LU Zhiling;WANG Ting;XU Xiaoying;WANG Liqing;ZHANG Wei(Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources,Ministry of Education,Shanghai Ocean University,Shanghai 201306,China;Engineering Research Center of Environmental DNA and Ecological Water Health Assessment,Shanghai Ocean University,Shanghai 201306,China;Shanghai Water Conservancy Management Department,Shanghai 200002,China;Shanghai Aquatic Wildlife Conservation Research Center,Shanghai 200092,China)
出处
《上海海洋大学学报》
北大核心
2025年第1期56-68,共13页
Journal of Shanghai Ocean University
基金
上海市科学技术委员会项目(19DZ1204504)
上海市水务局项目(11N78361358220211402)。
关键词
城市河道
浮游植物
功能群
环境过滤作用
随机性过程
urban river
phytoplankton
functional groups
environmental filtering effect
stochastic process
