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Predicting Site Productivity of Mixed Conifer Stands in Northern Idaho from Soil and Topographic Variables¹

ABSTRACT

Characteristics of 32 soils, consisting of an upper sequum influenced by volcanic ash over a buried sequum, and topographic variables were used to develop prediction equations for site index, height, and total volume of mixed coniferous stands in northern Idaho. Soil and topographic variables explained 70% of the variation in site index. Ninety-four percent of the variation in height of the site trees, and 86% of the variation in total volume of the stand were explained by soil and topographic properties and age. Depth of volcanic ash influence, bulk density, P content, and elevation were important soil and topographic variables.

Site index was negatively correlated with elevation, and positively correlated with extractable Ca, exchange acidity, cation exchange capacity, organic matter, total N, soil to rock ratio of the buried soils, and clay of the ash derived soils.

¹ Contribution of the Univ. of Idaho, Forest, Wildlife, and Range Exp. Stn., Moscow, ID. Contributions no. 139. Supported in part by funds provided by the McIntire-Stennis Cooperative Research Program (MS-16).

² Graduate Assistant and Professor of Forestry, College of Forestry, Wildlife, and Range Sciences, Univ. of Idaho, Moscow, ID 83843; respectively. The senior author is presently the Forest Soils Specialist for the State Department of Forestry, 2600 State Street, Salem, OR 97310.

Received for publication December 1, 1977. Accepted for publication June 23, 1978.