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This article in SSSAJ

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

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Effect of Periodic Burning on Soil Nitrogen Concentrations in Ponderosa Pine1

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



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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