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This article in SSSAJ

  1. Vol. 50 No. 2, p. 452-457
     
    Received: Feb 22, 1984


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doi:10.2136/sssaj1986.03615995005000020040x

Effect of Periodic Burning on Soil Nitrogen Concentrations in Ponderosa Pine1

  1. W. W. Covington and
  2. S. S. Sackett2

Abstract

Abstract

To determine the effects of different burning intervals on soil N status in substands of sapling-, pole-, and sawtimber-sized ponderosa pine (Pinus ponderosa Laws.) we sampled plots burned at 1-, 2-, and 4-yr intervals by three strata at two depths (0–5 and 5–15 cm). Generally, NH4+ and NO3- concentrations were higher on plots repeatedly burned than on unburned controls. However, plots not reburned for 4 to 5 yr had concentrations similar to controls. No significant difference in total (organically bound) N was found among treatments. We conclude that frequent periodic burning can be used to enhance N availability in southwestern ponderosa pine sites.

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