本网讯（通讯员 贾梦召） 近日，我校南水北调学院暨水资源与现代农业学院南水北调中线水源区流域生态安全国家高等学校学科创新引智基地（111基地）南水北调流域生态安全团队在国际知名期刊《Environmental Research》（JCR一区，影响因子7.7）发表了题为“Algal Community Can Alter the Role of a Drinking Water Reservoir as a CO2 Source or Sink at Different Seasons”的研究论文，2023级研究生贾梦召为论文第一作者，卢志文教授和李奕璇博士为论文共同通讯作者，南阳师范学院南水北调学院暨水资源与现代农业学院2024级水质科学与技术专业本科生宋鸣浩为论文作者之一，南阳师范学院为 第一署名单位，是我校南水北调“111基地”国际合作的又一科研成果。
论文以丹江口水库为研究对象，系统揭示了浮游植物群落结构如何通过生态机制调控分层水体中的碳交换过程。研究发现，丹江口水库的二氧化碳通量存在明显的季节变化规律，藻类群落的功 能多样性、演替和垂直分布是驱动这一变化的关键因素。不同藻类类群通过其特有的 生长 策略，在水库不同季节和水层中驱动着二氧化碳源汇状态的转变。这项研究为大型饮用水水库的碳汇评估和生态管理提供了重要科学依据，对深入理解区域和全球碳预算中的水生生物反馈机制具有重要价值。
论文网址链接 ：https://doi.org/10.1016/j.envres.2025.122983
论文引用: Mengzhao Jia, Yixuan Li , Yuying Li, Minghao Song, Mengyao Wu, Mingming Gao, Zhiwen Lu , B. Larry Li , Nicola Fohrer. Algal community can alter the role of a drinking water Reservoir as a CO2 source or sink at different seasons. Environmental Research , 2025, 286, 122983.
Highlights
• Phytoplankton α-diversity highest in summer and lowest in winter in DJR.
• Cyanobacteria and Bacillariophyta are indicators of phytoplankton α-diversity in DJR.
• CO2 flux shifts from a C source in autumn to a C sink in spring and summer.
• WT, DO and CODMn drive phytoplankton and CO2 dynamics.
• Dominant algae affect carbon sources and sinks across DJR water layers.
Abstract
In large drinking water reservoirs, changes in CO2 flux (F (CO2 )) are limited by physical processes, biological community structure and functional strategies. This study investigates the vertical response relationship between the composition and diversity structure of the phytoplankton community, CO2 concentration (C (CO2 )) and flux. The indicators included different water layers in the Danjiangkou Reservoir (DJR) across seasons from November 2023 to August 2024. The α-diversity index of phytoplankton was highest in summer and lowest in winter. The F (CO2 ) showed a seasonal rhythm. The strongest CO2 source occurred in autumn with 260.14 ± 56.81 mg·(m2 ·d)−1 and the strongest CO2 sink occurred in spring with −261 ± 113.38 mg·(m2 ·d)−1 . Concurrently, the bottom water column exhibited relatively high C (CO2 ) in spring and summer, reaching up to 1939.83 ± 159.31 ppm. Linear regression and redundancy analysis (RDA) showed that water temperature (WT), dissolved oxygen (DO), and the potassium permanganate chemical oxygen demand index (CODMn ) reflected the change of CO2 accumulation and phytoplankton community structure. Partial Least Squares Path Modeling (PLS-PM) further revealed that meteorological factors (p < 0.001), hydrochemical factors (p < 0.05), and phytoplankton diversity (p < 0.05) significantly affected C (CO2 ). The change of algae community at different water depths determines whether the reservoir is a CO2 source or a sink. For example, Microcystis sp. and Eudorina sp. were more conducive to CO2 sinks in the surface layer, but more conducive to CO2 sources in the middle and bottom layers, while Asterionella sp. contributed to CO2 sequestration in different water layers. This study has critical ecological significance for the dynamic transformation of CO2 source and sink states in large drinking water reservoirs.
