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Site Index Conversion Equations for Mixed Black Spruce-Lodgepole Pine Stands

Author(s) or contact(s): G.D. Nigh and P.V. Krestov
Source: Research Branch
Subject: Growth and Yield
Series: Extension Note
Other details:  Published 1999. Hardcopy is available.


Site index conversion equations allow the site index of one species to be estimated from the site index of another species when they are growing in mixed stands or for stand conversions. This study develops site index conversion equations for mixed black spruce (Picea mariana [Mill.] B.S.P.) - lodge-pole pine (Pinus contorta var. latifolia Dougl.) stands. The data come from plots established in northern British Columbia by the University of British Columbia. Twenty-six plots with height and breast height age measurements for both black spruce and lodgepole pine were available. The site indexes for both species were estimated from these data and the geometric mean regression line was fit, resulting in a site index conversion equation.

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Updated April 19, 2007