湖泊科学2026，Vol.38Issue(3)：931-942,12.DOI:10.18307/2026.0312
丹江口水库(丹库区)浮游植物功能群时空特征及水质评价
Spatiotemporal characteristics of phytoplankton functional groups and water quality evalu-ation in Dankou District,Danjiangkou Reservoir
摘要
Abstract
The Danjiangkou Reservoir serves as a critical water source for the middle route of the South-to-North Water Diversion Project and is designated as a national first-level drinking water protection zone.Since the project's impoundment in 2014,the o-verall water quality in the reservoir area has consistently met or exceeded Class Ⅱ standards,underscoring its vital ecological and water resource functions.Water level fluctuation,as a key operational parameter,directly shapes the aquatic environment and indi-rectly influences the growth,distribution,and diversity of phytoplankton.To evaluate how water-level-induced habitat changes af-fect phytoplankton functional groups in the Danku District of Danjiangkou Reservoir,this study conducted sampling and analysis during high-water(October-December 2023)and low-water(April-June 2024)periods.We examined the structure and composi-tion of phytoplankton functional groups and the environmental drivers affecting them.A total of 128 phytoplankton species from 75 genera and 7 phyla were identified across varying spatiotemporal conditions.Chlorophyta(37.33％),Bacillariophyta(36.00％),and Cyanophyta(14.67％)dominated the phytoplankton community.Significant differences in functional group composition were observed across time and space.In total,26 functional groups were identified,including groups N and P(adapted to mixed water columns),Y and T(suited to stagnant waters),and generalist groups M and Lo.During the high-water period,functional group B dominated in the main reservoir,whereas groups MP,P,and Lo were dominant during the low-water period.In the tributaries,groups M,Lo,and S1 prevailed in the high-water period,while groups TC and B dominated in the low-water period.Redundancy analysis revealed that pH,turbidity,nitrate nitrogen,and phosphate were the primary environmental factors influencing dominant functional groups.Q-index-based water quality assessment indicated that the main reservoir water quality was generally"good",while tributary water quality ranged from"poor"to"good".These findings suggest that although water quality remains stable in the main reservoir,tributaries experience notable nutrient pollution impacts on phytoplankton communities during high-water periods,highlighting the need for management attention to external inputs under high-water conditions.关键词
丹江口水库/浮游植物/功能群/水质评价/Q指数Key words
Danjiangkou Reservoir/phytoplankton/functional groups/water quality assessment/Q-index引用本文复制引用
靳佳霖,吕绪聪,曾大海,丁厚宽,高云霓,陈海燕,袁华涛,李学军..丹江口水库(丹库区)浮游植物功能群时空特征及水质评价[J].湖泊科学,2026,38(3):931-942,12.基金项目
河南省南水北调渠首生态环境监测应急中心河南省生态质量监测样地现场调查与评价项目资助. （）
