Evaluation of predictive models for Douglas-fir bark thickness at breast height following 12 biomass harvest treatments |
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Affiliation: | 1. Department of Forest Management, University of Montana, 32 Campus Drive, Missoula, 59812, MT, USA;2. Department of Mathematical Sciences, University of Montana, 32 Campus Drive, Missoula, 59812, MT, USA;1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;1. Department of Wood Science, Dendrology and Geobiocenology, Mendel University in Brno, Brno, Czech Republic;2. Department of Forest Botany, Dendrology and Geobiocenology, Mendel University in Brno, Brno, Czech Republic |
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Abstract: | Foresters often require an estimation of bark thickness from a reference height (typically breast height) to accurately estimate the bark or wood volume of a tree. Various models for estimating the bark thickness of interior Douglas-fir (Pseudotsuga menziesii var. glauca) from measured dbh (diameter at breast height) were evaluated. Sample trees were from northern Rocky Mountain mixed conifer stands that had been subjected to four levels of experimental woody biomass harvesting. Among simple linear, nonlinear, and segmented linear mixed effects models, the segmented linear model performed best. A join point (where the linear equations are linked) for the segmentation was statistically detected at approximately 19.0 cm dbh. The join point seems to indicate the size at which juvenile Douglas-fir trees boost the production of bark tissue, perhaps as those trees express dominance over competing understory vegetation. Woody biomass utilization level had no impact on bark thickness, indicating that the bark:dbh relationship does not depend on biomass utilization intensity. The study results enable accurate bark thickness estimation for interior Douglas-fir in this region, and suggest several silvicultural applications for juvenile Douglas-fir stand management. |
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Keywords: | Interior Douglas-fir Bark thickness Segmented linear regression Biomass harvesting Northern Rocky Mountains |
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