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Height Growth Models for Western Larch in British Columbia

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British Columbia's foresters currently use height growth curves developed with data from Montana to estimate the height and productivity of western larch (Larix occidentalis). The ability of the presently used curves to accurately predict the height growth of British Columbia's larch population is unknown. The production of new curves with local data could improve our ability to predict heights and allow increasingly precise yield projections in British Columbia. Data from 105 western larch stem analysis plots were collected from across the natural range of larch in British Columbia. The measured plots were naturally established, fire-origin, even-aged, and exhibited no indications of suppression or disease. A Richards function was fit to the data from each plot and used to generate height-age and site index information. Four models were fit to the plot data: conditioned logistic, Chapman Richards, conditioned Chapman Richards, and conditioned Weibull. The Chapman Richards model had the best fit to the data, although all four models had similar fit statistics. Overall, the Chapman Richards model is slightly more accurate at estimating heights than the currently used model. West.J. Appl. For. 17(2):66–74.

Keywords: Site index; breast height age; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; growth models; height growth; natural resource management; natural resources; western larch

Document Type: Miscellaneous

Affiliations: 1: Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, B.C., V6T 1Z4 2: Research Branch, British Columbia Ministry of Forests, P.O. Box 9519 Stn. Prov. Govt., Victoria, B.C., V8W 9C2

Publication date: April 1, 2002

More about this publication?
  • 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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