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Competition Between Species During Nitrification in Soil¹

ABSTRACT

Previously we have derived equations which describe populations of nitrifying organisms growing in an idealized soil column perfused with nutrient solutions. Population growth in the soil column at any particular depth is here discussed in terms of a kinetic model that allows for exhaustion of nutrient or space, i.e., surface area limitation, whether or not death occurs, and competition between two species in the same niche. The model in its various ramifications is subject to laboratory tests and points up inadequacies in current understanding of the microscopic ecology of nitrification.

Contribution from the Dep. of Soils and Plant Nutrition, College of Agr. Sci., Univ. of California, Berkeley, Calif. Supported in part by the Kearney Foundation of Soil Science and prepared while the senior author was a visiting Research Worker at the Agricultural Research Council, Letcombe Laboratory, Wantage, Berks., England.

² Prof. of Soil Biology and Assistant Research Chemist, respectively, Dep. of Soils & Plant Nutrition, University of California, Berkeley, 94720.

Received for publication October 4, 1971. Accepted for publication March 28, 1972.