Vol: 41 Page: 221

Authors:
Katarzyna Kaźmierczak
Witold Pazdrowski
Agnieszka Jędraszak
Marek Szymański
Marcin Nawrot

Title:
 Crown width of a tree and its relationships with age, height and diameter at breast height based on common oak (Quercus Robur L.)

Language: English

Keywords:
crown width
diameter at breast height
height
stepwise regression
common oak (Quercus robur L.)

Summary:
The paper presents results of studies on a relationship between crown width with basic measurements of the tree. The aim of the analysis was to determine the strength of the relationship between crown diameter of a tree and its diameter at breast height and height as well as age. Moreover, regression equations were developed for the estimation of crown width. The experimental material comprised measurement data of 33 oaks (aged from 41 to 148 years). In view of the statistically significant dependence between crown width of oaks and measured tree traits the analysis of regression was conducted, assuming the investigated traits (age, height and diameter at breast height) as explanatory variables. The forward stepwise regression was applied. Crown width of a tree may be determined both on the basis of information on the age, height and diameter at breast height of a tree. Diameter at breast height was the best among measurable traits of a tree for the estimation of crown width.

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