School of Energy and Environment, Anhui University of Technology, Maanshan City 243002, China.
Key Laboratory of Yangtze River Water Environment of the Ministry of Education, Tongji University, Shanghai 200092, China.
Sci Total Environ. 2023 May 20;874:162481. doi: 10.1016/j.scitotenv.2023.162481. Epub 2023 Feb 28.
Many lakes are suffering from eutrophication and heavy metals-contamination. However, the combined impacts of algae bloom and its induced variations in heavy metals on microbial community in sediment from eutrophic lakes remain unclear. In this study, we performed field experiments to investigate how algae bloom impacted water soluble organic matter (WSOM) and heavy metals in sediment from Chaohu Lake, a eutrophic shallow lake, and probed their combined impacts on sediment bacterial community structure. The results showed that algae bloom increased WSOM quantity, in particular, the soluble microbial by-product-like (SMP) and fulvic acid-like (Fa-L) components markedly enhanced by 203.70 % and 70.17 %, respectively. We also found that algae bloom redistributed the spatial patterns of heavy metals and altered their chemical species in sediment, then promoted contamination degree and potential ecological risk of heavy metals in sediment. Moreover, sediment bacterial community richness and diversity obviously decreased after algae bloom, and the variance partitioning analysis (VPA) results showed that combined impacts of algae-induced changes in WSOM and heavy metals explained 66.56 % of the variations in bacterial community structure. These findings depicted how algae bloom influence sediment WSOM and heavy metals, and revealed the combined impacts of algae-induced variations on microbial community structure in shallow eutrophic lake.
许多湖泊都遭受着富营养化和重金属污染的问题。然而，藻类水华及其诱导的重金属变化对富营养化湖泊沉积物中微生物群落的综合影响仍不清楚。在这项研究中，我们进行了野外实验，以研究藻类水华如何影响巢湖（一个富营养化的浅水湖泊）沉积物中的水溶性有机物质（WSOM）和重金属，并探讨了它们对沉积物细菌群落结构的综合影响。结果表明，藻类水华增加了 WSOM 的数量，特别是可溶性微生物副产物样（SMP）和腐殖酸样（Fa-L）成分分别显著增加了 203.70%和 70.17%。我们还发现，藻类水华改变了重金属在沉积物中的空间分布模式，并改变了其化学形态，从而增加了重金属在沉积物中的污染程度和潜在生态风险。此外，藻类水华后沉积物细菌群落丰富度和多样性明显下降，方差分解分析（VPA）结果表明，藻类诱导的 WSOM 和重金属变化的综合影响解释了细菌群落结构变化的 66.56%。这些发现描绘了藻类水华如何影响沉积物中的 WSOM 和重金属，并揭示了藻类诱导的变化对浅水富营养化湖泊中微生物群落结构的综合影响。
