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Site Index of Balsam Poplar/Western Black Cottonwood in Interior and Southcentral Alaska

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Abstract:

Stem analysis data were obtained from 268 balsam poplar (Populus balsamifera L.) and black cottonwood (P. trichocarpa Torr. & Gray) trees on 67 sites in interior and southcentral Alaska during 1988-1990 for the purpose of height and volume growth analysis. A modified form of the Chapman-Richards growth model was used to produce polymorphic site index curves. Wide variations in curve shape, which were evident in region-to-region comparisons, required stratification of the data. Site index curves for balsam poplar north of the Alaska Range were produced using one equation and data from 35 sites. The remaining 32 sites, located south of the Range, were divided by landform (fluvial vs. upland). Sites on the middle and upper Susitna and Chulitna Rivers were placed in a separate fluvial class, giving three equations for sites south of the Range. The four equations produce the first polymorphic site index curves for poplars in Alaska. North. J. Appl. For. 15(4):174-181.

Document Type: Journal Article

Affiliations: Agricultural and Forestry Experiment Station, School of Agriculture and Land Resources Management, University of Alaska Fairbanks, Fairbanks, AK 99775

Publication date: 1998-12-01

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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 Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.
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