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Related Concept Videos

The Phosphorus Cycle01:21

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Far-future hydrology will differentially change the phosphorus transfer continuum.

Per-Erik Mellander1, Golnaz Ezzati1, Conor Murphy2

  • 1Agricultural Catchments Programme, Department of Environment, Soils and Landuse, Teagasc, Johnstown Castle, Ireland.

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Summary
This summary is machine-generated.

Climate change will increase phosphorus (P) delivery to freshwater, especially in groundwater-fed catchments. Identifying critical P mobilization areas is key for effective mitigation strategies to protect water quality.

Keywords:
Climate changeCritical Mobilisation AreaDeliveryImpactMobilisationWater quality

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Area of Science:

  • Environmental Science
  • Hydrology
  • Water Quality Management

Background:

  • Climate change intensifies land-to-water phosphorus (P) transfers, degrading freshwater quality in Northwestern Europe.
  • Understanding P loss dynamics under changing hydrological regimes is crucial for effective mitigation planning.

Purpose of the Study:

  • To assess the impact of climate-induced hydrological changes on the P transfer continuum in six contrasting Irish river catchments.
  • To estimate changes in total P (TP) and total reactive P (TRP) transfer processes under future climate scenarios (RCP4.5 and RCP8.5).

Main Methods:

  • Utilized far-future climate scenarios (RCP4.5, RCP8.5) of modelled river discharge.
  • Linked observed hydrological regimes (baseflow, flashiness) to P transfer processes (mobilisation, delivery indices).
  • Compared projected P transfer processes for 2080 (2070-2099) against 2020 (2010-2039) baseline.

Main Results:

  • P mobilisation is projected to remain relatively stable across catchments under both RCP scenarios.
  • P delivery is highest in flashy catchments, with significant increases projected in groundwater-fed catchments under RCP8.5 (+22% TRP, +24% TP).
  • Inter-annual variability of P delivery is expected to rise in groundwater-fed systems.

Conclusions:

  • Hydrological connections to P mobilisation areas are increasing, making them critical targets for mitigation.
  • Focusing on hydrologically connected areas with favourable P mobilisation conditions (soil/bedrock chemistry, biology, hydrology) is recommended.
  • Effective water quality management requires targeted strategies addressing critical P mobilisation zones, not solely P source magnitudes.