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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 (document genres) trees statistics
Location:
North and Central Idaho; Eastern Washington; Western Montana; Northeastern Oregon
Publisher:
Western Journal of Applied Forestry
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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Source
Preferred Citation:
"Height-Diameter Equations for Ten Tree Species in the Inland Northwest", Idaho Forestry Research Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/forestryresearch/items/forestryresearch895.html
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Educational use includes non-commercial use of text and images in materials for teaching and research purposes. Digital reproduction rights granted by University of Idaho Library. For other uses beyond educational use, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
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