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Related Experiment Videos

Nitrogen export from a watershed subjected to partial salvage logging.

M Herrmann1, W E Sharpe, D R DeWalle

  • 1School of Forest Resources and Environmental Resources Research Institute, The Pennsylvania State University, University Park 16802, USA.

Thescientificworldjournal
|June 14, 2003
PubMed
Summary

Salvage logging of declining forests significantly increased nitrogen (N) loss in watersheds. This N export remained elevated, indicating long-term ecosystem stress and greater N leaching than from healthy forest harvests.

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Area of Science:

  • Forestry
  • Ecology
  • Environmental Science

Background:

  • Logging is known to increase nitrogen (N) leaching.
  • Forests with prior decline symptoms may experience greater stress from logging.

Purpose of the Study:

  • To assess N export from a watershed undergoing salvage logging of declining oak.
  • To compare N loss from salvage logging in stressed forests versus healthy stands.

Main Methods:

  • A 10-year (1988-1998) assessment of N export from the Baldwin Creek watershed.
  • Partial clear-cutting to salvage dead and dying northern red oak.
  • Monitoring of nitrate-nitrogen (NO3-N) export levels.

Main Results:

  • N export significantly increased post-salvage logging.

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  • The highest annual NO3-N export (13 kg/ha) occurred the first year after harvest.
  • N loss from Baldwin Creek was considerably greater than other Appalachian watersheds.

    • Conclusions:

    • Salvage logging of declining forests can lead to substantial N losses.
    • Slow revegetation and increased N availability contribute to elevated N leaching.
    • Salvage logging in this region may cause greater N loss than harvesting healthy stands.