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Updated: Jun 28, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Microbially Induced Soil Colloidal Phosphorus Mobilization Under Anoxic Conditions.

Kamel M Eltohamy1,2, Daniel Menezes-Blackburn3, Erwin Klumpp4

  • 1Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.

Environmental Science & Technology
|April 22, 2024
PubMed
Summary
This summary is machine-generated.

Anoxic conditions significantly increase colloidal phosphorus (Pcoll) in soils, transforming small particles into larger aggregates. Microbial activity, particularly fungi, drives this release, enhancing phosphorus mobility and transport into floodwaters.

Keywords:
anoxic conditionscolloidal phosphorusfloodplain soilsmicrobe-associated colloidsphosphorus mobilization

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Area of Science:

  • Soil Science
  • Environmental Chemistry
  • Microbiology

Background:

  • Colloidal phosphorus (Pcoll) dynamics are critical for understanding soil nutrient cycling and water quality.
  • Anoxic conditions, common in flooded soils, can significantly alter phosphorus speciation and mobility.
  • Previous research has focused less on the specific behavior of Pcoll under fluctuating redox conditions.

Purpose of the Study:

  • To investigate the behavior and transformation of colloidal phosphorus (Pcoll) in acidic floodplain soil under induced anoxic conditions.
  • To quantify the changes in Pcoll size distribution and aggregation during a simulated flooding event.
  • To elucidate the role of microbial communities in Pcoll mobilization and transport.

Main Methods:

  • Incubation of acidic floodplain soil under controlled oxic and anoxic conditions for 30 days.
  • Measurement of pore-water colloidal phosphorus (Pcoll) concentrations and size fractions using advanced analytical techniques.
  • Analysis of colloidal morphology and aggregation using electron microscopy.
  • Microbial community analysis via 16S rRNA and ITS sequencing to identify key players in Pcoll dynamics.

Main Results:

  • A rapid shift from oxic to anoxic conditions caused a significant increase in pore-water Pcoll, exceeding soluble P by over 2.7-fold.
  • Colloidal fractions shifted from dispersed (<220 nm) to aggregated forms (>220 nm), indicating enhanced aggregation under anoxia.
  • Electron microscopy confirmed the transformation of dispersed colloids into larger, aggregated particles.
  • Microbial activity, with a notable contribution from fungi over bacteria, was identified as the primary driver of anoxia-induced Pcoll release and aggregation.

Conclusions:

  • Anoxia profoundly impacts colloidal phosphorus (Pcoll) behavior in soils, leading to increased concentrations and aggregation.
  • Microbial communities, especially fungi, play a crucial role in mediating Pcoll mobilization and transport under flooded conditions.
  • These microbially-driven changes in Pcoll dynamics have significant implications for phosphorus release from soils into aquatic ecosystems.