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Effect of Periodic Burning on Soil Nitrogen Concentrations in Ponderosa Pine¹

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.

¹ Contribution from the School of Forestry, Northern Arizona Univ., Flagstaff, AZ. 86011, and Rocky Mountain Forest and Range Exp. Stn., Fort Collins, CO.

² Associate Professor, School of Forestry, Northern Arizona Univ., and Research Forester, Rocky Mountain Forest and Range Exp. Stn., USDA Forest Service, respectively.

Received for publication February 22, 1984.

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