Post-immobilization phosphorus fluctuations drive selective microbial hydrolysis of sedimentary organic phosphorus and long-term P release.

Major post-immobilization phosphorus fluctuations in lake sediments drive r-strategist microbial SOP hydrolysis, boosting orthophosphate ester (C-O-P) hydrolysis to 1.49 mg·m -2 ·d -1 while limiting SOP mineralization to 47.11%.

• Why it matters: Post-immobilization P fluctuations in overlying water may trigger long-term endogenous P replenishment from sediments, but SOP hydrolysis pathways and microbial interactions are not well resolved.
• What they did: Over the long term, sediment fractionation, enzymatic assays, FT-ICR-MS, 31 P NMR, and Zipi analysis were used to link SOP fraction changes to microbial r- and K-strategist utilization patterns and gene carriers (phoX, phnJ).
• The result: Minor P fluctuations favored K-strategists with phnJ-bearing Proteobacteria, achieving higher SOP resource utilization (61.22%) and DIP compensation via dissolved IP flux regulation through SOP substrate selectivity.

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