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Diameter growth equations for Douglas-fir and grand fir in the western Willamette Valley of Oregon

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dc.creator Zumrawi, Abdel Azim
dc.creator Hann, David W.
dc.creator Oregon State University. Forest Research Laboratory
dc.date.accessioned 2008-01-22T22:39:43Z
dc.date.available 2008-01-22T22:39:43Z
dc.date.issued 1993
dc.identifier.uri http://hdl.handle.net/1957/7618
dc.description "Equations for predicting diameter growth are an essential component of single-tree growth and yield models (Munro 1974). Diameter growth predictions are used to characterize individual-tree development and to project the growth of stand basal area and volume. Both diameter growth and basal area growth have been used as the dependent variable in modeling the development of a tree's diameter (Holdaway 1984, Ritchie and Hann 1985, Wykoff 1986, Wensel et al. 1987, Dolph 1988). The choice of which dependent variable to use has usually been suggested by the data, including the behavior of the residuals and the goodness-of-fit of the resulting equations. Ritchie and Hann (1985) developed nonlinear basal-area growth equations for Douglas-fir (Pseudotsuga menziesii) and grand fir (Abies grandis). It was intended that the equations would be used to predict individual- tree diameter growth in the western Willamette Valley version of ORGANON (Hann et al. 1992). However, Hann and Larsen (1991) found that using a basal-area growth equation to predict diameter growth could result in erratic and unreasonable predictions of diameter growth for trees with small diameters. Therefore, the objective of the present study was to develop diameter growth equations for Douglas-fir and grand fir in the western Willamette Valley of Oregon by using the equation form of Hann and Larsen (1991)."--Introduction en
dc.format.extent 320364 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Corvallis, Or. : College of Forestry, Forest Research Laboratory, Oregon State University en
dc.relation Explorer Site -- Oregon Explorer en
dc.relation Explorer Site -- Forest Explorer en
dc.relation.ispartofseries Research contribution (Oregon State University. Forest Research Laboratory) en
dc.relation.ispartofseries 4 en
dc.subject.lcsh Douglas fir -- Oregon -- Willamette Valley -- Growth -- Mathematical models en
dc.subject.lcsh Abies grandis -- Growth -- Mathematical models en
dc.subject.lcsh Forests and forestry -- Measurement -- Mathematical models en
dc.title Diameter growth equations for Douglas-fir and grand fir in the western Willamette Valley of Oregon en
dc.type Technical Report en
dc.coverage.spatialecoregion Willamette Valley en


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