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Five plants per treatment were monitored to measure height and crown width (two vertical directions); then, the crown area was calculated by the formula of a circle (S = ∏r2) with the maximum crown width as the diameter.
This model assumes that the crown of Norway spruce consist of a cone above the maximum crown width, and a truncated cone between this maximum crown width and the base of the crown.
The maximum crown width is assumed to occur at 33% of the crown length from below, and the crown width at the base of the crown is assumed to be half of the maximum crown width.
Thus, the crown model of Pretzsch (2001) probably could be improved by relating the position of the maximum crown width to these variables.
From the additional influence of dominant height and dbh in the leaf area model we conclude that the used crown model could be improved by estimating the position of the maximum crown width and the crown width at the base of the crown depending on these two variables.
Similar(55)
We explored relationships among tree height, diameter at breast height (DBH), crown width, crown senescence, and vegetation density.
Tree growth characteristics including height, crown width, and growth rate were investigated.
Varieties responded differently in crown width and HTLC, and this was influenced by treatments and site.
We measured tree height, diameter at breast height (dbh), crown width, and height to the base of the live crown (HTLC) annually for four years.
Some models may predict changes in other tree attributes such as height to crown base, crown ratio, crown width, and so on.
Crown width might increase on the expense of crown length, but the combination of both keeps the scaling of the crown volume rather stable.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com