限制CO2（aq）条件下的蓝藻优势增加了岩溶储层的生态风险

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-06-20 DOI:10.1016/j.watres.2025.124060

Guangrong Ran , Jingan Chen , Ziyan Zhang , Yan Zeng , Chao Yin , Jia Yu , Dong Wu , Haijun Yuan , Moshan Cen

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引用次数: 0

摘要

蓝藻水华的频繁发生，特别是在湖泊和水库中，对水生生态系统和人类健康构成重大威胁。CO2的有效性在浮游植物群落从硅藻和绿藻为主向蓝藻为主转变过程中起着关键作用。喀斯特地区地表水pH值自然偏高，加上水库的季节性热分层，导致喀斯特地区水库地表水含水CO2（CO2(aq)）缺乏更为明显。然而，无机碳动态变化对喀斯特水库浮游植物群落的影响尚不清楚。因此，本文选取了西南岩溶地区两个典型的次深层储层作为研究对象。在一年的时间里，每月收集地表水样本和季节性垂直剖面水样。分析了营养物、溶解无机碳（DIC）和含水CO2（CO2(aq)）浓度，以及DIC （δ13CDIC）和浮游植物种类的稳定同位素组成。结果表明：暖季地表水CO2（aq）浓度显著低于冷季，蓝藻丰度(r= -0.80, p <；0.01)与CO2（aq）浓度呈极显著负相关，硅藻(r= -0.22, p >；0.05)和绿藻(r= -0.06, p >；0.05)与CO2（aq）浓度相关性较差。这表明浮游植物生长的CO2（aq）缺乏条件有利于蓝藻的优势。热分层期间，底层水体CO2（aq）浓度显著高于地表水。这表明储层中的热分层阻碍了垂直CO2交换，使地表水更容易受到CO2限制，更有利于蓝藻的优势。此外，喀斯特地区储层pH较高，可能加剧了地表水CO2（aq）的缺乏，相应地增强了蓝藻的优势。此外，随着全球变暖，气温上升和沉积物中营养物质的释放将增加水库中蓝藻繁殖的风险。该研究突出了全球变暖背景下岩溶储集层蓝藻优势的高风险，为岩溶储集层的生态脆弱性提供了新的认识。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Cyanobacterial dominance under CO2(aq)-limited conditions increases ecological risks in karst reservoirs

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Cyanobacterial dominance under CO2(aq)-limited conditions increases ecological risks in karst reservoirs

The frequent occurrence of cyanobacterial blooms, especially in lakes and reservoirs, poses a significant threat to aquatic ecosystems and human health. The availability of CO₂ plays a critical role in shifting phytoplankton communities from diatom and green algae dominance to cyanobacterial dominance. The naturally high pH of surface water in karst regions, coupled with seasonal thermal stratification in reservoirs, leads to a more pronounced aqueous CO₂ (CO₂(aq)) deficiency in surface water of karst reservoirs. However, the impact of dynamic changes in inorganic carbon on phytoplankton communities in karst reservoirs remains unclear. Therefore, two typical sub-deep reservoirs in the karst region of southwestern China were selected in this study. Monthly surface water samples and seasonal vertical profile water samples were collected over a period of one year. The concentrations of nutrients, dissolved inorganic carbon (DIC), and CO₂(aq), as well as the stable isotope composition of DIC (δ¹³C_DIC) and phytoplankton species, were analyzed. The results showed that surface water CO₂(aq) concentrations were considerably lower in the warm season compared to the cold season, and cyanobacterial abundance (r= -0.80, p < 0.01) showed a significant negative correlation with CO₂(aq) concentration, while diatoms (r= -0.22, p > 0.05) and green algae (r= -0.06, p > 0.05) showed poor correlations with CO₂(aq) concentration. This indicates that CO₂(aq) deficiency conditions for phytoplankton growth favor the dominance of cyanobacteria. The CO₂(aq) concentration in the bottom water was significantly higher than that in the surface water during the period of thermal stratification. This indicates that thermal stratification in reservoirs impedes vertical CO₂ exchange, making surface water more susceptible to CO₂ limitation and more conducive to cyanobacterial dominance. In addition, the nature of high pH of the karst reservoirs may exacerbate CO₂(aq) deficiency in surface water, correspondingly enhancing cyanobacterial dominance. Furthermore, with global warming, the temperature rise and accompanying nutrient release from the sediment will increase the risk of cyanobacterial blooms in the reservoirs. This study highlights the high risk of cyanobacterial dominance in karst reservoirs in the context of global warming, and provides new insights into the ecological vulnerability of these reservoirs.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.