Kozak's Variable-Exponent Taper Equation Regionalized for White Spruce in Alberta

Authors: Huang, Shongming; Price, Daryl; Morgan, Dave; Peck, Karl

Source: Western Journal of Applied Forestry, Volume 15, Number 2, 1 April 2000 , pp. 75-85(11)

Publisher: Society of American Foresters

Buy & download fulltext article:

OR

Price: $29.50 plus tax (Refund Policy)

Abstract:

Kozak's (1988) variable-exponent taper equation was estimated for white spruce by ecoregion of Alberta to reflect stem form variability among different ecoregions. Inspection of fit statistics and residual plots showed that the taper equation fitted the data quite well. Since the relative height constraint p had little impact on the overall performance of the taper equation, the optimum p value was estimated as a part of the nonlinear least squares procedures. Regional differences of the taper equation were examined and tested using the nonlinear extra sum of squares method. Ecoregions of similar taper relationships were combined to provide a composite equation. Performance of the taper equation in predicting diameter inside bark, total volume, and merchantable height was evaluated. Results indicated that the biases in predictions were small, both across different parts of the stem and for various tree sizes. West. J. Appl. For. 15(2):75-85.

Document Type: Journal Article

Affiliations: Forest Management Division, Land and Forest Service, Alberta Environment, 8th Floor, 9920-108 Street, Edmonton, Alberta, Canada T5K 2M4

Publication date: April 1, 2000

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.
  • Membership Information
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page