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Height-Diameter Equations for Ten Tree Species in the Inland Northwest Item Info

Individual tree height-diameter equations were developed for ten major species in the inland Northwest. The Wykoff function in the Stand Prognosis Model and the Lundqvist function were fit to data which included many large-sized trees. The two models fit the data equally well for all species. Prediction results using the existing Prognosis equation, the refitted Wykoff function, and the Lundqvist function showed that the three models predicted similar heights for trees of small diameter. However, both the refitted Wykoff function and the Lundqvist function predicted larger tree heights for trees with dbh greater than 20 in. for most species. The estimated heights for tree diameters of 70 or 80 in. from the Lundqvist function were closer to the observed ""asymptotic"" tree heights than the other two. The Lundqvist function showed lower prediction errors for the validation data for the majority of the tree species, especially for large-sized trees.

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Title:
Height-Diameter Equations for Ten Tree Species in the Inland Northwest
Creator:
Moore, J.A.; Zhang, L.; Stuck, D.
Date Created (ISO Standard):
1996
Description:
Individual tree height-diameter equations were developed for ten major species in the inland Northwest. The Wykoff function in the Stand Prognosis Model and the Lundqvist function were fit to data which included many large-sized trees. The two models fit the data equally well for all species. Prediction results using the existing Prognosis equation, the refitted Wykoff function, and the Lundqvist function showed that the three models predicted similar heights for trees of small diameter. However, both the refitted Wykoff function and the Lundqvist function predicted larger tree heights for trees with dbh greater than 20 in. for most species. The estimated heights for tree diameters of 70 or 80 in. from the Lundqvist function were closer to the observed "asymptotic" tree heights than the other two. The Lundqvist function showed lower prediction errors for the validation data for the majority of the tree species, especially for large-sized trees.
Subjects:
research trees statistics
Source:
Moore, J.A., L. Zhang and D. Stuck, 1996. Height-diameter equations for ten tree species in the Inland Northwest. West. J. Appl. For. 11(4):132-137
Source Identifier:
Height-Diameter_Equations_for_Ten_Tree_Species_in_the_Inland_NW_WJAF_011_004_1996
Type:
Text
Format:
application/pdf

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Preferred Citation:
"Height-Diameter Equations for Ten Tree Species in the Inland Northwest", Intermountain Forestry Cooperative, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iftnc/items/iftnc4813.html
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This document is provided by the University of Idaho Library for use by University of Idaho students, staff, and faculty. All rights to the document linked from this metadata belong to the author, rights holder, and/or provider. For more information contact The Intermountain Forestry Cooperative, https://www.uidaho.edu/cnr/ifc
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