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Nitrogen Mineralization and Uptake from Douglas-Fir Forest Floors¹

ABSTRACT

Many different plant species grow in the understory in association with Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco]. The nature of the forest floor that accumulates in a Douglas-fir forest is influenced by these associated species. Nitrogen uptake from forest floor materials developed under nine commonly occurring stand understory conditions was evaluated in a greenhouse experiment with Douglas-fir seedlings. The net mobilization of N as measured by the uptake of N by two successive crops of Douglas-fir seedlings ranged for 0.34 to 9.89% of the amount added as organic matter. Net N mobilization was related only partially to total N content of the material.

¹ Technical Paper no. 2771. Oregon Agric. Exp. Stn., Corvallis.

² Professor of Forest Soils, Oregon State Univ. Corvallis, OR 97331. The author gratefully acknowledges the assistance of Dr. Roger Petersen, Dep. of Statistics, in the statistical analysis and Dr. P. H. Cochran, former Graduate Research Assistant, int he greenhouse phases.

Received for publication September 6, 1977. Accepted for publication December 14, 1977.