| 三峡水库神农溪浮游植物群落结构及其与环境因子的关系 |
| Phytoplankton Community Structure and Its Relationship with Environmental Factors in Shennong Stream of Three Gorges Reservoir |
| 投稿时间：2020-01-29 修订日期：2020-12-01 |
| DOI：10.15928/j.1674-3075.2020.06.004 |
| 中文关键词:神农溪 浮游植物 环境因子 时空变动特征 典范对应分析 |
| 英文关键词:Shennong Stream phytoplankton environmental factors spatial and temporal variation canonical correlation analysis (CCA) |
| 基金项目:国家自然科学基金（51709189，51679152）；国家重大水利工程建设基金安排项目12620200600018J003；重庆市技术创新与应用示范项目（cstc2018jszx-zdyfxmX0021） |
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| 中文摘要: |
| 神农溪作为“引江补汉”工程的比选源头之一，维持其良好水质状况具有重要意义。作为反映水环境质量重要指标的浮游植物，其群落结构受三峡季节性蓄水倒灌的影响。探究神农溪浮游植物群落结构的时空变动特征及其与环境因子的关系，有利于对浮游植物采取有针对性的防治措施。2016年5月（低水位运行期）和10月（高水位运行期），沿神农溪上游至下游江段开展了浮游植物调查，采用数量生态学方法研究了神农溪浮游植物群落结构的时空变动特征及其与环境因子的关系。结果显示，浮游植物种类数5月比10月略低，但均以绿藻门(Chlorophyta)、硅藻门(Bacillariophyta)和蓝藻门(Cyanophyta)种类为主；浮游植物密度5月在各个采样站点间呈波动分布特征，而10月从河口区到上游回水变动区呈纵向梯度分布特征；两次采样的优势种均以富营养型水体指示藻类为主，其群落结构空间分布特征存在较大差异，但均不显示明显的沿河流纵向梯度分布的特征；影响浮游植物空间分布的最重要因子，5月为高锰酸盐指数(CODMn)，而10月则为浊度(Turb)；浮游植物主要种类的空间差异性与所处采样点环境因子的浓度梯度差异以及藻类自身生物学特征明显相关。该研究结果可为神农溪水环境保护提供基础资料。 |
| 英文摘要: |
| Shennong Stream is an important water source for the project “Diverting the Yangtze River to Hanjiang River”, and it is crucial to maintain its good water quality. The phytoplankton community is an important indicator of water quality in Shennong Stream and it is affected by seasonal water storage and impoundment in Three Gorges Reservoir. In this study, the spatial and temporal variation of phytoplankton community characteristics in Shennong Stream and their relationships with environmental factors were studied using quantitative ecological methods. The study was based on a field survey of the upper and lower reaches of Shennong Stream in May (low water level operating period) and October (high water level operating period) 2016. A total of 97 phytoplankton species from 62 genera and 7 phyla were observed during the investigation, with absolute dominance by Chlorophyta, Bacillariophyta and Cyanophyta. The number of phytoplankton species in May was slightly lower than in October, and the species composition at each sampling site was different. Phytoplankton density fluctuated among sampling sites in May, and presented a longitudinal gradient from estuary to upstream backwater in October. The dominant species during the two sampling periods were indicators of eutrophication. The phytoplankton community structure displayed evident spatial differences, but no longitudinal gradient. The factor most associated with the spatial distribution of phytoplankton was the permanganate index (CODMn) in May and turbidity (Turb) in October. Spatial differences in the primary phytoplankton species were closely correlated with nutrient concentrations among the different sampling sites, and the biological characteristics of different algae species. Our results provide basic information for the protection and management of water quality in Shennong Stream. |
| 胡莲,邹 曦,郑志伟,张志永,杨 晴,万成炎,潘晓洁.2020.三峡水库神农溪浮游植物群落结构及其与环境因子的关系[J].水生态学杂志,41(6):27-36. |
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