Skip to Main Content
Allometric equations for urban ash trees (Fraxinus spp.) in Oakville, Southern Ontario, CanadaAuthor(s): Paula J. Peper; Claudia P. Alzate; John W. McNeil; Jalil Hashemi
Source: Urban Forestry & Urban Greening. 13(1): 175-183
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (1.0 MB)
DescriptionTree growth equations are an important and common tool used to effectively assess the yield and determine management practices in forest plantations. Increasingly, they are being developed for urban forests, providing tools to assist urban forest managers with species selection, placement, and estimation of management costs and ecosystem services. This study describes the development of allometric equations for Fraxinus americana and F. pennsylvanica growing in Oakville, Canada. With data collected from 103 ash trees, five allometric models were tested to develop equations estimating diameter-at-breast-height (dbh), tree height, crown width and crown height, using age and dbh as explanatory variables. Mean annual growth rates are presented to demonstrate species growth performance and were not significantly different over the first 40 years of growth for the two species. Of all the tested random coefficient models for both species, the cubic with weight 1/x provided the best fit for estimating dbh from age. The best models for other parameters were the loglog for crown height from dbh, the quadratic for crown diameter from dbh, and the linear for tree height from dbh for F. americana. Model types showed more consistency for F. pennsylvanica with linear providing the best fit for crown diameter, crown height and tree height from dbh. The number of model types suggests the difficulty of fitting any single model to the vast array of conditions affecting plant growth in urban areas where management practices and environment can significantly influence tree size and growth. These models may be used to estimate the growth of ash tree populations in Oakville and communities with similar climate, soil, planting, and management environments.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationPeper, Paula J.; Alzate, Claudia P.; McNeil, John W.; Hashemi, Jalil. 2014. Allometric equations for urban ash trees (Fraximus spp.) in Oakville, Southern Ontario, Canada. Urban Forestry & Urban Greening. 13(1): 175-183.
KeywordsAllometry, Fraxinus spp., Growth models, Urban trees
- White ash (Fraxinus americana L.) survival and growth in unmanaged upland forests
- Genetic transformation of Fraxinus spp. for resistance to the emerald ash borer
- Genetic, spatial, and temporal aspects of decline and mortality in a Fraxinus provenance test following invasion by the emerald ash borer
XML: View XML