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This article in SSSAJ

  1. Vol. 44 No. 2, p. 395-400
     
    Received: Aug 16, 1978
    Accepted: Dec 14, 1979


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doi:10.2136/sssaj1980.03615995004400020038x

Effects of Fire on Nitrogen in Forest Floor Horizons1

  1. G. D. Mroz2,
  2. M. F. Jurgensen2,
  3. A. E. Harvey3 and
  4. M. J. Larsen4

Abstract

Abstract

The effects of burning no nitrogen (N) losses and transformations in red pine (Pinus resinosa Ait.), eastern hemlock [Tsuga canadensis (L.) Carr.], and Douglas-fir (Pseulotsuga menziesii)/western larch (Larix occidentalis Nutt.) forest floor were investigated. Organic horizon samples were burned at 400°C for 30 min in a top-heating oven to simulate field conditions. Measurements taken immediately after burning showed total and available N losses from the O1 horizons but gains in total and available N in underlying layers. After burning, the litter was incubated for 5 weeks and analyzed for ammonium and nitrate concentrations and changes in acidity. Each forest floor type displayed varying patterns of ammonification, nitrification and immobilization of N. The N changes appeared related to the differing initial N contents of the organic material.

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