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Effects of adding tree, stand, and site variables to Kozak's variable-exponent taper eq...
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Effects of adding tree, stand, and site variables to Kozak's variable-exponent taper equation
作者:
Charles K. Muhairwe,
Valerie M. LeMay,
Antal Kozak,
期刊:
Canadian Journal of Forest Research
(NRC Available online 1994)
卷期:
Volume 24,
issue 2
页码: 252-259
ISSN:0045-5067
年代: 1994
DOI:10.1139/x94-037
出版商: NRC Research Press
数据来源: NRC
摘要:
Crown class, site class, and breast-height age were incorporated into Kozak's variable-exponent taper equation (A. Kozak. 1988. Can. J. For. Res. 18: 1363–1368) for three species: Douglas-fir (Pseudotsugamenziesii(Mirb.) Franco), western red cedar (ThujaplicataDonn), and aspen (PopulustremuloidesMichx.). For lodgepole pine (PinuscontortaDougl.), crown ratio, breast-height age, and quadratic mean diameter were incorporated into Kozak's taper equation. The effects of adding these variables to the exponent part of the taper equation on the prediction abilities of the taper model were assessed for prediction of diameter inside bark along the stem, total tree volume, and tree merchantable height. It was found that apart from the use of crown ratio for lodgepole pine, the additional variables resulted in only marginal improvements to the published version of Kozak's taper function. Therefore, the cost of measuring these additional variables is not justifiable.
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