摘要
选取珠江上游深水型水库龙滩水库为研究对象,于2019年4、7、10月和2020年1月4个季节采集了水库支流表层水、库区分层水和下泄水,分析其水化学参数、SO_(4)^(2-)浓度及δ^(34)S_(SO4)与δ^(18)O_(SO4)同位素组成,基于冗余分析和贝叶斯稳定同位素混合模型等手段,阐明了筑坝拦截影响下的水动力条件改变对龙滩水库水体硫循环的影响。结果表明:龙滩水库SO_(4)^(2-)的主要来源是硫化物矿物氧化(以O2或Fe3+为电子受体),此外,还包括大气降水、人为源。筑坝拦截后,水体SO_(4)^(2-)浓度以及δ^(34)S_(SO4)和δ^(18)O_(SO4)值波动范围显著增大。筑坝蓄水会导致水体相对水柱稳定度(relative water column stability,RWCS)升高,在较高的RWCS条件下,水库内部的硫化物氧化和硫酸盐还原等过程显著增强,因此,RWCS是驱动水库硫循环的重要水动力因素。本研究有助于深入理解水库内部硫酸盐迁移转化过程的水动力驱动机制,为深水型水库水资源科学利用与保护提供理论依据。
We evaluated the effects of dam interception on sulfur cycle in Longtan Reservoir,a deep-water reservoir in the upper reaches of the Pearl River.Water samples were quarterly collected from tributaries,stratified water and underflow water in April,July,October 2019 and January 2020.Hydrochemical parameters,SO_(4)^(2-)concentrations and isotopic compositions(δ^(34)S_(SO4)andδ^(18)O_(SO4))in water samples were analyzed.Based on redundancy analysis and Bayesian stable isotope mixing model,we examined the impacts of altered hydrodynamic conditions under the influence of damming on sulfur cycle in the water column of Longtan Reservoir.The results showed that the main source of SO_(4)^(2-)was sulfide oxidation(with O2 or Fe3+as electron acceptors),and also included atmospheric precipitation and anthropogenic sources.After damming and impoundment,the fluctuation range of SO_(4)^(2-)concentration andδ^(34)S_(SO4)andδ^(18)O_(SO4)values in the water column significantly increased.Water storage after dam impoundment led to an increase in relative water column stability(RWCS),which significantly enhanced sulfide oxidation and sulfate reduction in the reservoir.Thus,RWCS is an important hydrodynamic factor driving the sulfur cycle in the reservoir.This study is helpful to further understand hydrodynamic mechanisms driving sulphate transport and transformation processes in reservoirs,providing a theoretical basis for the scientific utilization and protection of water resources in deep-water reservoirs.
作者
关天昊
杨梦迪
崔高仰
丁士元
王亦尧
张雪程
李晓东
GUAN Tianhao;YANG Mengdi;CUI Gaoyang;DING Shiyuan;WANG Yiyao;ZHANG Xuecheng;LI Xiaodong(School of Earth System Science,Tianjin University,Tianjin 300072,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2023年第10期2394-2401,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(U1612442)
国家重点研发计划项目(2016YFA0601000)资助。
关键词
硫循环
水柱相对稳定度
贝叶斯稳定同位素混合模型
龙滩水库
sulfur cycle
relative water column stability
Bayesian stable isotope mixing model
Longtan Reservoir.
