%0 Journal Article
%A Achim, A.
%A Gardiner, B.A
%A Leban, J.M.
%A Daquitaine, R.
%T Predicting the branching properties of Sitka spruce grown in Great Britain
%B New Zealand Journal of Forestry Science
%D 2006
%V 36
%P 246-264
%N 2/3
%X Predictions of the branching characteristics of Sitka spruce (Picea
sitchensis (Bong.) Carr.) were made as part of the development of
a timber properties simulation tool. For each annual growth unit,
non-linear modelling was used to describe the average number of branches
and their associated diameter, insertion angle, and probability of
being alive. The parameters for the model were obtained using the
branching characteristics of 60 trees collected from a range of locations
across Scotland and northern England. The non-linear equations describing
the branching properties gave an adequate representation of the mean
of each branch property from the top to the base of the tree. Analysis
of the residuals around the stem revealed that branches grew bigger
on the south side but were more numerous on the north side. The predictions
used a total of only six predictor variables that can be obtained
from normal mensurational data and from the height growth history
of the trees. Yield tables could hence be used to run two simulations
of typical Sitka spruce stands managed under a thinning or no-thinning
regime. As expected, the effect of thinning was to increase branch
diameter, to lower the height at which branches die, and to increase
the number of branches without having any effect on their insertion
angle. After incorporation of clear-wood properties, the model will
be used to predict the properties of sawn battens.
%K branching knots picea sitchensis wood quality modelling
%# amriv2
%Z timestamp=(2012.06.28)
%F AchimGardinerLebanEtAl2006
%3 BibTeX type = ARTICLE