Author(s): Tianyu Zhuo
Linked Author(s):
Keywords: P release; Hydrostatic pressure; Microbial drivers; Diffusive gradients in thin films; Metagenome
Abstract: Deep reservoirs vary in their hydrostatic pressure owing to artificial water level control. The potential migration of phosphorus (P) in reservoir sediments raises the risk of harmful algal blooms. To ascertain the mechanisms of endogenous P release in reservoirs, we characterised aquatic microbial communities associated with coupled iron (Fe), P and sulphur (S) cycling at the sediment–water interface. The responses of microbial communities to hydrostatic pressures of 0.2–0.7 mega pascals (MPa; that is, micro-pressures) were investigated through a 30-day simulation experiment. Our findings unravelled a potential mechanism that micro-pressure enhanced the solubilisation of Fe/aluminium (Al) -bound P caused by microbially-driven sulphate reduction, leading to endogenous P release in the deep reservoir.
Year: 2024