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The Phosphorus Cycle01:21

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Updated: Sep 3, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Phosphorus control and dredging decrease methane emissions from shallow lakes.

Thomas P A Nijman1, Maxime Lemmens1, Miquel Lurling2

  • 1Department of Aquatic Ecology and Environmental Biology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands.

The Science of the Total Environment
|July 26, 2022
PubMed
Summary
This summary is machine-generated.

Lanthanum modified bentonite (LMB) and dredging reduce methane (CH4) emissions from freshwater ecosystems. These methods improve water quality and mitigate climate change by lowering greenhouse gas output.

Keywords:
Climate change mitigationFreshwater ecosystemsInternal nutrient loadingLanthanum-modified bentoniteMacrophytesMethanogens

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Area of Science:

  • Environmental Science
  • Ecology
  • Biogeochemistry

Background:

  • Freshwater ecosystems are significant sources of methane (CH4), a potent greenhouse gas.
  • Eutrophication is increasing CH4 emissions, necessitating effective management strategies.
  • The impacts of lanthanum modified bentonite (LMB) and dredging on CH4 emissions remain unclear.

Purpose of the Study:

  • To investigate the effects of LMB and dredging on CH4 emissions in freshwater mesocosms.
  • To understand the mechanisms by which these management techniques influence CH4 production and release.
  • To assess the combined effects on water quality, microbial communities, and physicochemical parameters.

Main Methods:

  • A full-factorial mesocosm experiment was conducted over 18 months.
  • Measurements included diffusive and ebullitive CH4 fluxes, plant community composition, and methanogen/methanotroph activity and community structure.
  • Physicochemical water and sediment variables were analyzed.

Main Results:

  • LMB addition significantly decreased total CH4 emissions.
  • Dredging showed a trend towards decreasing CH4 emissions.
  • Both methods influenced CH4 emissions by altering nutrient availability, plant cover, and microbial communities, with seasonal variations observed.

Conclusions:

  • LMB and dredging effectively reduce CH4 emissions from freshwater ecosystems.
  • These techniques offer a dual benefit of improving water quality and mitigating climate change.
  • Understanding microbial and ecological responses is key to optimizing these management strategies.