溶解氧和水温驱动浮游植物群落的垂直时空变化：来自最大调水水源区的证据。

Dissolved Oxygen and Water Temperature Drive Vertical Spatiotemporal Variation of Phytoplankton Community: Evidence from the Largest Diversion Water Source Area.

机构信息

International Joint Laboratory of Watershed Ecological Security and Collaborative Innovation Center of Water Security for Water Source Region of Middle Route Project of South-North Water Diversion in Henan Province, College of Water Resource and Environment Engineering, Nanyang Normal University, Nanyang 473061, China.

College of Water Resources, North China University of Water Resources and Electric Power, Zhengzhou 450046, China.

出版信息

Int J Environ Res Public Health. 2023 Feb 28;20(5):4307. doi: 10.3390/ijerph20054307.

DOI:10.3390/ijerph20054307

PMID:36901317

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10002381/

Abstract

In order to study the vertical distribution characteristics of phytoplankton in the Danjiangkou Reservoir, the water source of the Middle Route Project of the South-North Water Diversion, seven sampling sites were set up in the Reservoir for quarterly sampling from 2017 to 2019, and water environment surveys were conducted simultaneously. The results showed that 157 species (including varieties) were identified, belonging to 9 phyla and 88 genera. In terms of species richness, Chlorophyta had the largest number of species, accounting for 39.49% of the total species. The Bacillariophyta and Cyanobacteria accounted for 28.03% and 13.38% of the total species, respectively. From the whole Danjiangkou Reservoir, the total phytoplankton abundance varied from 0.09 × 10 to 20.01 × 10 cells/L. In the vertical distribution, phytoplankton were mainly observed in the surface-thermospheric layer (I-II layer) and the bottom layer, while the Shannon-Wiener index showed a trend of gradually decreasing from the I-V layer. The Surfer model analysis showed that there was no significant stratification in the Q site's water temperature (WT) and dissolved oxygen (DO) levels in the water diversion area during the dynamic water diversion process. A canonical correspondence analysis (CCA) showed that DO, WT, pH, electrical conductivity (Cond), chemical oxygen demand (COD), total phosphorus (TP), ammonia nitrogen (NH-N), and total nitrogen (TN) had significant effects on the vertical distribution of phytoplankton ( < 0.05). A partial Mantel analysis showed that the vertical distribution of the phytoplankton community was related to WT, and the phytoplankton community structure at the other sites, except for Heijizui (H) and Langhekou (L), was affected by DO. This study has positive significance for exploring the vertical distribution characteristics of a phytoplankton community in a deep-water dynamic water diversion reservoir.

摘要

为研究南水北调中线工程水源地丹江口水库的浮游植物垂直分布特征，于 2017—2019 年在水库设置 7 个采样点，进行季度采样，同时开展水环境调查。结果表明，共鉴定浮游植物 157 种（含变种），隶属于 9 门 88 属。从种类丰富度来看，绿藻门种类最多，占总种类数的 39.49%；其次是硅藻门和蓝藻门，分别占总种类数的 28.03%和 13.38%。从整个丹江口水库来看，浮游植物总丰度范围为 0.09×10~20.01×10 cells/L。在垂直分布上，浮游植物主要分布在表温层（I—II 层）和底层，而 Shannon-Wiener 指数则表现出从 I—V 层逐渐降低的趋势。Surfer 模型分析表明，在调水过程中，丹江口水库取水口（Q 点）水温（WT）和溶解氧（DO）水平在动态调水过程中没有明显的分层。典范对应分析（CCA）表明，DO、WT、pH、电导率（Cond）、化学需氧量（COD）、总磷（TP）、氨氮（NH-N）和总氮（TN）对浮游植物的垂直分布有显著影响（<0.05）。部分 Mantel 分析表明，浮游植物群落的垂直分布与 WT 有关，除黑咀子（H）和浪河口（L）外，其余各站位的浮游植物群落结构受 DO 影响。该研究对探索深水库动态调水条件下浮游植物群落的垂直分布特征具有积极意义。