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Developing and Evaluating Tree Height-Diameter Models at Three Geographic Scales for Black Spruce in Ontario

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A total of 11,612 black spruce trees were measured from permanent sample plots across the boreal and central regions of Ontario and were used to fit the well-known Chapman-Richards growth model at provincial, regional, and ecoregional scales. The results suggest that the height-diameter relationships of black spruce vary with different geographic regions and scales. There were significant variations in height-diameter relationships for black spruce between boreal and central regions as well as among some of the seven ecoregions. The ecoregion-based height-diameter models presented here will provide more accurate predictions for tree height and, consequently, tree volume than these models developed at both provincial and regional scales. Furthermore, the heterogeneity of tree species should be considered in developing and applying ecoregion-based height-diameter models for predicting local tree height.
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Keywords: Chapman-Richards growth function; Permanent sample plot; ecoregion; forest management

Document Type: Regular Article

Affiliations: 1: Ministry of Natural Resources Ontario Forest Research Institute 1235 Queen Street East, Sault Ste. Marie ON Canada P6A 2E5 2: Faculty of Forestry State University of New York, College of Environmental Science and Forestry One Forestry Drive Syracuse NY 13210 3: Faculty of Forestry and the Forest Environment Lakehead University 955 Oliver Road Thunder Bay ON Canada P7B 5E1 4: Forest Management Division Land and Forest Service, Alberta Environment 9920-108 Street Edmonton AB Canada T5K 2M4

Publication date: 2004-06-01

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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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