Effect of temperature on surface fluid sediment properties with cyanobacterial bloom biomass accumulation

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Chunliu Wang , Da Xu , Bosong Zhu , Leilie Bai , Lei Huang , Helong Jiang
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Abstract

In eutrophic shallow lakes, cyanobacterial blooms will occur frequently and then settle into sediment, leading the formation of fluid sediment. Several factors including temperature can influence surface sediment properties. In this study, the influence of temperatures on surface sediment properties was determined in microcosm experiments through monitoring sediment physicochemical and rheological properties. During one-month incubation, it was found that surface sediment density and water content varied exponentially with increase in temperatures from 10 to 35 ℃. The results of particle size distribution indicated that cyanobacterial blooms biomass (CBB) degradation in sediment led to sediment flocculation and agglomeration. In the meantime, there were high ratios polysaccharide/protein in extracellular polymeric substances (EPSs), which enhanced the sediment particle agglomeration. Further, the yield stress in rheological test for sediment with (R2 = 0.97) and without (R2 = 0.85) CBB presented an exponential decay with increase in temperatures. And a threshold value at 20 ℃ for sediment critical shear stress (τcr) indicated that sediment could be resuspended easier when temperature was more than 20 ℃. Altogether, this study showed that the increase in temperatures with a threshold at 20 ℃, can cause sediment particle flocculation, resulting in a loose and fragile structure. And the results would be helpful to sediment management considering environmental effects of sediment suspension for eutrophication shallow lakes.

Abstract Image

温度对蓝藻水华生物量积累的表层流体沉积物特性的影响
在富营养化的浅水湖泊中,蓝藻会频繁繁殖,然后沉淀到沉积物中,形成流动沉积物。包括温度在内的多种因素都会影响表层沉积物的性质。本研究通过监测沉积物的物理化学和流变特性,在微观世界实验中确定了温度对表层沉积物特性的影响。在为期一个月的培养过程中发现,表层沉积物的密度和含水量随着温度从 10 ℃ 到 35 ℃ 的升高呈指数变化。粒径分布结果表明,沉积物中蓝藻生物量(CBB)的降解导致了沉积物的絮凝和团聚。同时,细胞外高分子物质(EPSs)中的多糖/蛋白质比例较高,增强了沉积物颗粒的团聚。此外,含(R2 = 0.97)和不含(R2 = 0.85)CBB 的沉积物在流变测试中的屈服应力随温度升高呈指数衰减。沉积物临界剪切应力(τcr)的临界值为 20 ℃,这表明当温度超过 20 ℃ 时,沉积物更容易被重新悬浮。总之,这项研究表明,温度升高到 20 ℃ 时,会引起沉积物颗粒絮凝,导致结构松散和脆弱。考虑到沉积物悬浮对浅水湖泊富营养化的环境影响,该研究结果将有助于沉积物管理。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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