Note—Foliage-Sapwood Area Equations for Balsam Fir Require Local Validation

Authors: Daniel W. Gilmore¹; Robert S. Seymour²

Source: Forest Science, Volume 50, Number 4, August 2004 , pp. 566-570(5)

Publisher: Society of American Foresters

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Abstract:

The foliage-sapwood area relationship (A_L/A_S) for balsam fir has been described in three separate studies with no less than four regression model forms. While there are clear differences in predicted A_L values between the studies, it is not apparent if these differences are an artifact of the regression model form used or caused by regional differences in the A_L/A_S relationship. We extracted published A_L and A_S values from the literature to statistically determine the best model form to describe the A_L/A_S relationship. Using this model form, we then explicitly tested for regional differences in the A_L/A_S relationship. We found that a linear model using natural logarithmic transformations best satisfied the assumptions of least squares regression in describing the A_L/A_S relationship. Based on the published data, there may be regional differences in the A_L/A_S relationship for balsam fir. FOR. SCI. 50(4):566–570.

Keywords: Crown mass; foliage; projected leaf area; silviculture; tree growth; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resources; natural resource management

Document Type: Research article

Affiliations: 1: Department of Forest Resources, North Central Research and Outreach Center University of Minnesota 1861 Highway 169 East Grand Rapids MN 55744-3396 Phone: (218) 327-4522;, Fax: (218) 327-4126, Email: dgilmore@umn.edu 2: Department of Forest Ecosystem Science University of Maine 5755 Nutting Hall Orono ME 04469-5755 Phone: (207) 581-2860;, Fax: (207) 581-4257, Email: seymour@apollo.umenfa.maine.edu

Publication date: 2004-08-01

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