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Effects of Burning on Chaparral Soils: II. Soil Microbes and Nitrogen Mineralization¹

ABSTRACT

Undisturbed moist and dry soil slabs collected from beneath two species of chaparral plants were burned at varying intensities in the laboratory. Treatment by intense burning over dry soil destroyed 67% of the total N and produced large amounts of NH₄⁺. Treatment by intense and moderate burning over moist soil slabs removed only 25% of the total N, and a large portion of the remaining organic N was quickly ammonified after the fire by reinvading heterotrophic bacteria and later by fungi. All three burning treatments resulted in high levels of NH₄⁺ in the soil after the fire. Nitrosomonas group bacteria did not respond to these high levels of available NH₄⁺, and the nitrification that occurred was attributed to heterotrophic nitrification.

¹ Contribution from Pacific Southwest Forest & Range Exp. Stn., Forest Service, USDA, P. O. Box 245, Berkeley, CA 94701.

² Research Microbiologist; formerly Principal Soil Scientist, Pacific Southwest Forest & Range Exp. Stn., now Supervisory Soil Scientist, Rocky Mountain Forest & Range Exp. Stn., Ft. Collins, Colo., stationed at Tempe, Ariz.; and Botanist, respectively.

Received for publication October 6, 1978. Accepted for publication February 22, 1979.

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