摘要
全球变暖背景下,台风和暴雨等极端天气事件频发,进而严重影响亚热带水库生态过程。本文以福建省泉州市供水水库(山美水库)为例,基于连续5年(2019年至2023年)的监测数据,探讨了山美水库藻类水华和pH偏高对不同降雨气象条件的响应特征和机制。结果表明,山美水库藻类水华通常发生在4月至8月,主要丰度优势类群为丝状蓝藻;库区表层水pH每年超过9的天数最高为139 d,主要发生在4月至8月。真光层热分层强度(每米温差≥0.20℃)、7日内无降雨天数(无降雨天数<4 d)和总氮(<1.80 mg/L)是导致蓝藻成为丰度优势类群的显著因素。真光层热分层强度(每米温差≥0.15℃)、7日内无降雨(无降雨天数≥7 d)和总磷(≥0.034 mg/L)是导致pH大于9的关键因素。研究结果揭示了降雨气象条件、蓝藻与pH的内在关系,明确了水库蓝藻优势形成和pH超标时的气象和环境因子阈值,可为未来气候变化背景下闽三角城市供水水库水质安全保障与生态管理提供基础数据和科学依据。
Under the backdrop of global warming,extreme weather events such as typhoons and storms are increasingly complicating the ecological processes in subtropical reservoirs.Based on five years of continuous monitoring data from 2019 to 2023 at Shanmei Reservoir in Fujian,we explored the response characteristics and mechanisms of algal blooms and high pH events to different rainfall-related meteorological conditions.The results show that algal blooms typically occurred from April to August,with filamentous cyanobacteria being the dominant species in terms of abundance.The maximum number of days per year with pH exceeding 9 reached 139,primarily occurring from April to August.The thermal stratification intensity in the euphotic layer(temperature difference per meter≥0.20℃),the number of non-rainy days within 7 days(fewer than 4 rainy days within 7 days),and total nitrogen(less than 1.80 mg/L)significantly contributed to the dominance of cyanobacterial abundance.Significant factors,including the thermal stratification intensity in the euphotic layer(temperature difference per meter≥0.15℃),the number of non-rain days within 7 days(more than 7 non-rain days)and total phosphorus(≥0.034 mg/L)were key to pH increase(higher than 9).These results reveal the intrinsic relationships between meteorological conditions,cyanobacteria,and pH,and identify the meteorological and environmental threshold values when cyanobacterial dominance occurs and pH exceeds 9,thereby providing scientific basis for developing water quality management and protection strategies for urban drinking-water reservoirs in the golden triangle of southern Fujian Province under future climate change scenarios.
作者
陈辉煌
金磊
卢亦帆
王江滨
薛媛媛
罗安琪
王靖斌
张宏腾
Nwabuisi Simon Onyekachi
杨军
CHEN Huihuang;JIN Lei;LU Yifan;WANG Jiangbin;XUE Yuanyuan;LUO Anqi;WANG Jingbin;ZHANG Hongteng;NWABUISI Simon Onyekachi;YANG Jun(Aquatic EcoHealth Group,Fujian Key Laboratory of Watershed Ecology,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Life Sciences,Hebei University,Baoding 071002,China;Water Resources Allocation Center of the Shanmei Reservoir in Quanzhou,Quanzhou 362028,China)
出处
《生态学报》
北大核心
2025年第12期5649-5659,共11页
Acta Ecologica Sinica
基金
国家重点研发计划项目(2022YFF1301302,2023YFC3304300)
福建省对外合作项目(2022I0039)
厦门市自然科学基金面上项目(3502Z202473082)。
关键词
蓝藻水华
亚热带水库
PH
热分层
真光层
cyanobacterial bloom
subtropical reservoir
pH
thermal stratification
euphotic layer
作者简介
通讯作者:杨军.E-mail:jyang@iue.ac.cn。
