期刊
ENVIRONMENTAL RESEARCH
卷 201, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111525
关键词
In-situ technique; Sediment-water interface (SWI); Labile P; Lake sediment; Harmful algal blooms (HABs)
资金
- National Natural Science Founda-tion of China [42007333, 41773081]
- Natural Science Research Project of Higher Education in Jiangsu Province [20KJB610006]
- Startup Research Foundation for High-level Professionals of Nanjing Normal University [184080H202B228]
The study found that high biomass of harmful algal blooms (HABs) promotes sulfate reduction into labile sulfur, with iron-reducing bacteria being the dominant species; concentrations of labile iron greatly exceed labile sulfur, indicating microbial iron reduction is the principal pathway. In high algal biomass areas, Fe-P is the primary factor influencing phosphorus migration and transformation.
The Mechanisms driving phosphorus (P) release in sediment of shallow lakes is essential for managing harmful algal blooms (HABs). Accordingly, this study conducted field monitoring of labile P, iron (Fe), sulfur (S), and dissolved manganese (Mn) in different biomass of algae in Lake Taihu. The in-situ technique of ZrO-Chelex-AgI (ZrO-CA) diffusive gradients in thin-films (DGT) and high-resolution dialysis sampler (high resolution-Peeper (HR-Peeper)) were used to measure labile P, Fe, S, and dissolved Mn, as well as their apparent diffusion fluxes at the sediment-water interface (SWI). In addition, the distribution of iron-reducing bacteria (IRB) and sulfate-reducing bacteria (SRB) in sediments was also detected. Results showed that high HABs biomass promoted the reduction of sulfate into labile S, however, IRB is the dominant species. Thus, labile Fe concentrations greatly exceeded labile S concentrations across all sites, indicating that microbial iron reduction (MIR) is the principal pathway for ferric iron reduction. Furthermore, the simple relationship analysis revealed the principal influence P migration and transformation is the Fe-P in high algal biomass sites, while Fe and Mn redox reactions did not significantly influence labile P mobilization in low algal areas.
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