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Phosphorus dynamics along a river continuum.

Michael J Bowes1, William A House, Robin A Hodgkinson

  • 1Centre for Ecology and Hydrology-Dorset, Winfrith Technology Centre, Dorchester, Dorset DT2 8ZD, UK. mibo@ceh.ac.uk

The Science of the Total Environment
|August 19, 2003
PubMed
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The lowland zone significantly impacts river phosphorus levels, exporting most of the catchment

Area of Science:

  • Environmental Chemistry
  • Riverine Ecosystems
  • Nutrient Dynamics

Background:

  • Phosphorus is a critical nutrient influencing riverine ecosystems.
  • Understanding phosphorus dynamics is essential for managing water quality and ecological health.
  • River continuum studies help elucidate nutrient transport and transformation processes.

Purpose of the Study:

  • To assess changes in phosphorus concentration and form along a 110 km river.
  • To identify the role of within-channel storage in phosphorus dynamics.
  • To determine longitudinal transport patterns of phosphorus in a river continuum.

Main Methods:

  • Collected river water samples at 2-day intervals over two years (1998-2000).
  • Analyzed samples for total phosphorus (TP), total dissolved phosphorus (TDP), and soluble reactive phosphorus (SRP).

Related Experiment Videos

  • Differentiated catchment zones: upland (sheep farming), transitional, and lowland (intensive farming, sewage inputs).

    • Main Results:

    • Phosphorus concentrations (TP, TDP, SRP) increased downstream.
    • Soluble reactive phosphorus (SRP) peaked in summer and during low flows.
    • The lowland zone accounted for 85% of phosphorus export, primarily particulate-bound.
    • Upland areas contributed less than 5% to the total phosphorus budget.
    • Lowland export dominated during storm rising stages; transitional zone during falling stages.

    Conclusions:

    • Intensive agriculture and sewage inputs in the lowland zone are the primary drivers of phosphorus export.
    • Within-channel processes and sediment interactions significantly influence phosphorus form and transport.
    • Different catchment zones exhibit distinct phosphorus export dynamics related to hydrological events.