Fire dynamics and implications for nitrogen cycling in boreal forests

Jennifer W. Harden, Michelle Mack, Hugo Veldhuis, S. T. Gower

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


We used a dynamic, long-term mass balance approach to track cumulative carbon (C) and nitrogen (N) losses to fire in boreal Manitoba over the 6500 years since deglaciation. Estimated C losses to decomposition and fire, combined with measurements of N pools in mature and burned forest floors, suggest that loss of N by combustion has likely resulted in a long-term loss that exceeds the amount of N stored in soil today by 2 to 3 times. These estimates imply that biological N fixation rates could be as high as 5 to 10 times atmospheric deposition rates in boreal regions. At the site scale, the amount of N lost is due to N content of fuels, which varies by stand type and fire severity, which in turn vary with climate and fire dynamics. The interplay of fire frequency, fire severity, and N partitioning during regrowth are important for understanding rates and sustainability of nutrient and carbon cycling over millenia and over broad regions.

Original languageEnglish (US)
Pages (from-to)WFX 4-1 - WFXC 4-8
JournalJournal of Geophysical Research: Atmospheres
Issue number3
StatePublished - Feb 16 2003
Externally publishedYes


  • Boreal Ecosystem Atmosphere Study
  • Boreal forest
  • Carbon and nitrogen cycling
  • Fire emissions
  • Nitrogen loss

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology


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