Article
 

Tree crown ratio models for multi-species and multi-layered stands of southeastern British Columbia

Pubblico Deposited

Contenuto scaricabile

Scarica il pdf
https://ir.library.oregonstate.edu/concern/articles/h415p996q

Descriptions

Attribute NameValues
Creator
Abstract
  • The ratio of live crown length to tree height (crown ratio; CR) is often used as an important predictor variable for tree level growth equations, particularly for multi-species and multi-layered stands. Also, CR indicates tree vigour and can be an important habitat variable. Measurement of CR for each tree can be time-consuming and difficult to obtain in very dense stands and for very tall trees where the base of live crown is obscured. Models to predict CR from size, competition and site variables were developed for several coniferous and one hardwood tree species growing in multi-species and multi-layered forest stands (complex stands) of southeastern British Columbia. Simple correlations indicated the expected relationships of CR decreasing with increasing height, and with increasing competition. A logistic model form was used to constrain predicted CR values to the interval [0,1]. Also, predictors were divided into tree size, stand competition, and site measures, and the contribution of each set of contributors was examined. For all models, height was an important predictor. The stand competition measure, basal area of larger trees, contributed significantly to predicting CR given that crown competition factor was also included as a measure of competition. Logical trends in CR versus size and competition variable groups were reflected by the models; site variable slightly improved predictions for some species. Much of the variability in CR was not accounted for, indicating that other variables are important for explaining CR changes in these complex stands.
  • Keywords: basal area of larger trees, multi-species stands, crown ratio, multi-layered stands
Resource Type
DOI
Date Available
Date Issued
Citation
  • Temesgen, H., V.M. LeMay, and S.J. Mitchell. 2005. Tree crown ratio models for multi-species and multi-layered stands. For. Chron. 81(1): 133-141.
Journal Title
Journal Volume
  • 81
Journal Issue/Number
  • 1
Academic Affiliation
Dichiarazione dei diritti
Funding Statement (additional comments about funding)
  • We gratefully acknowledge the cooperation and financial support provided by the BC Ministries of Forests and of Sustainable Resource Management, and the department of Forest Resources at Oregon State University.
Publisher
Peer Reviewed
Language
Replaces

Le relazioni

Parents:

This work has no parents.

Elementi

Thumbnail Titolo Data caricata Visibilità Azioni
file details Tree_crown_ratio_models_for_multi-species_and_multi-layered_stands_of_southeastern_British_Columbia.pdf 2017-07-06 Pubblico Scaricare