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Related Experiment Videos

Nitrogen deposition in Mediterranean forests.

F Rodà1, A Avila, A Rodrigo

  • 1Center for Ecological Research and Forestry Applications, Universitat Autònoma de Barcelona, Bellaterra, Spain. roda@uab.es

Environmental Pollution (Barking, Essex : 1987)
|April 10, 2002
PubMed
Summary

Atmospheric nitrogen deposition in Montseny forests shows moderate inputs, with dry deposition of gases and small particles being significant. This suggests increasing nitrogen availability in these ecosystems.

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Area of Science:

  • Environmental Science
  • Ecology
  • Atmospheric Chemistry

Background:

  • Forest ecosystems are sensitive to atmospheric nitrogen deposition.
  • Nitrogen deposition can alter ecosystem processes and nutrient availability.
  • Understanding nitrogen deposition is crucial for forest management, especially near urban areas.

Purpose of the Study:

  • To quantify atmospheric inorganic nitrogen deposition at forested sites near Barcelona.
  • To differentiate between wet and dry deposition pathways.
  • To assess the long-term trends and sources of nitrogen deposition.

Main Methods:

  • Utilized bulk deposition, wet-only deposition, throughfall, and inferred dry deposition using branch-washes and surrogate plates.
  • Monitored deposition over a 16-year period at two forested sites and a lowland town.

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  • Analyzed inorganic nitrogen (ammonium and nitrate) concentrations.

    • Main Results:

    • Bulk deposition showed no significant temporal trends over 16 years, with moderate inputs (6-10 kg N ha(-1) year(-1)).
    • Wet-only deposition was similar to bulk deposition, indicating a minor role for large dry-sedimented particles.
    • Branch- and plate-washes revealed substantial dry deposition of nitrogen gases and fine particles.
    • Total atmospheric deposition was estimated at 15-22 kg N ha(-1) year(-1).

    Conclusions:

    • Atmospheric nitrogen deposition is a significant input to Montseny forests.
    • Dry deposition of gases and small particles contributes substantially to total nitrogen input.
    • The studied forests likely retain most of the deposited nitrogen, leading to increased ecosystem nitrogen availability.