Effects of physical and chemical characteristics of surface sediments in the formation of shallow lake algae-induced black bloom

沉积物 水华 布鲁姆 疏浚 环境科学 环境化学 藻类 孔隙水压力 地质学 海洋学 化学 浮游植物 地貌学 生态学 营养物 岩土工程 有机化学 生物
作者
Qiushi Shen,Cheng Liu,Qi‐Lin Zhou,Jingge Shang,Lei Zhang,Chengxin Fan
出处
期刊:Journal of Environmental Sciences-china [Elsevier]
卷期号:25 (12): 2353-2360 被引量:60
标识
DOI:10.1016/s1001-0742(12)60325-8
摘要

Surface sediments are closely related to lake black blooms. The dissolved oxygen (DO) distribution and its penetration depth in surface sediments as well as the migration and transformation of redox sensitive elements such as Fe and S at the sediment-water interface are important factors that could influence the formation of the black bloom. In this study, dredged and undredged sediment cores with different surface properties were used to simulate black blooms in the laboratory. The Micro Profiling System was employed to explore features of the DO and sigmaH2S distribution at the sediment-water interface. Physical and chemical characteristics in sediments and pore waters were also analyzed. The results showed that sediment dredging effectively suppressed the black blooms. In the undredged treatment, DO penetration depth was only 50 microm. Fe(2+) concentrations, sigmaH2S concentrations, and sigmaH2S production rates were remarkably higher in surface sediments and pore waters compared to control and dredged treatments. Furthermore, depletion of DO and accumulation of Fe(2+) and sigmaH2S in surface sediments and pore waters provided favorable redox environments and necessary material sources for the blooms. The study results proved that physical and chemical characteristics in surface sediments are important factors in the formation of the black bloom, and could provide scientific guidance for emergency treatment and long-term pre-control of black blooms.
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