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A Light-Adjusted Growth Intercept Model for Predicting White Spruce Site Index

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One of the challenges of managing spruce-aspen mixedwoods in the boreal forest is the difficulty in determining site index for spruce in those stands in which it occurs primarily in the understory. A study was conducted to determine if growth increment of understory spruce, adjusted for available light, could predict spruce site index. In each of nine stands, spruce site index was determined for three dominant trees. Available light (measured as proportion transmitted) and growth increment (estimated by the growth intercept method) were recorded for three to eight understory spruce per stand. Growth increment adjusted for available light predicted spruce site index better (R 2 = 0.56 or 0.63, depending on the model used) than unadjusted growth increment (R 2 = 0.10), thus indicating the potential for using light-adjusted growth increment to predict site index.

Keywords: Boreal mixedwoods; aspen; growth intercept; site index; spruce

Document Type: Research Article

Affiliations: 1: Forsite Forestry Services Ltd., Lethbridge, Alberta, Canada, T1K 6X5; 2: Department of Renewable Resources, University of Alberta, Edmonton, Alberta, T6G 2H1; 3: Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, T1J 4B1.

Publication date: 2006-04-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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