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- Title
Models for predicting vertical profiles of heartwood diameter in mature Scots pine.
- Authors
Flæte, Per Otto; Høibø, Olav
- Abstract
Variation in heartwood diameter (HWD) along the stem was studied in 106 mature Scots pines (Pinus sylvestris L.) sampled from southern Norway. HWD decreased from the base towards the treetop, following a profile similar to that of the stem diameter (shape of the tree). A few trees deviated from this general pattern. In these trees HWD increased from the base of the stem to a maximum at 2–2.5 m and then decreased towards the top of the tree. Random coefficient mixed models based on a second-degree polynomial of vertical position in the tree and tree variables that can be measured in the forest were developed to predict HWD profiles of pine stems. Seven different models were developed in steps, based on how easily the input variables can be measured. Input variables consisted of information describing the size and shape of trees and information from increment cores. Performances of the models were validated with an independent sample (R2 = 0.88–0.95, root mean square error = 12–19 mm). The high predictive abilities of the models indicate that they can be prospective tools for selecting trees and stem sections within trees to produce logs with HWD suitable for manufacturing of heartwood sawn-wood products.
- Subjects
NORWAY; SCOTS pine; HEARTWOOD; MATHEMATICAL models; MODEL validation; FOREST products; TECHNOLOGICAL innovations in logging
- Publication
Canadian Journal of Forest Research, 2009, Vol 39, Issue 3, p527
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/X08-187