Effect of height-to-diameter ratio on stem stiffness of sugi (Cryptomeria japonica) cultivars

Kijidani, Yoshio; Hamazuna, Tetsuya; Ito, Satoshi; Kitahara, Ryushi; Fukuchi, Shinsuke; Mizoue, Nobuya; Yoshida, Shigejiro

doi:10.1007/s10086-009-1060-2

Cited by 18 publications

(11 citation statements)

References 11 publications

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“…Moreover, height to diameter ratio had a significant effect on wood density and MOE, as other recent studies suggest, with tree slenderness reflecting the mechanical stability requirement of the tree [24,25].…”

Section: Discussionsupporting

confidence: 54%

White Spruce Growth and Wood Properties over Multiple Time Periods in Relation to Current Tree and Stand Attributes

Cortini

MacIsaac

Comeau

2016

Forests

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Abstract:The relationships between white spruce radial increment and wood properties were investigated in relation to tree and stand attributes using data from mature white spruce stands in the boreal forest of western Canada that experienced a range of shelterwood treatments. The model with the highest predictive ability was radial increment (adj-R 2 = 67%) and included crown attributes, diameter at breast height (DBH), average height of competitors, and a climate index. Radial growth was positively related to live crown ratio, whereas wood density and modulus of elasticity were negatively correlated to the crown attribute. Tree slenderness had a significant negative effect on wood density and modulus of elasticity, as it reflects the mechanical stability requirement of the tree. The models consistently improved when using annual averages calculated over longer periods of time. However, when the annual averages were calculated using time periods of 5-10 and 10-20 years prior to sampling, the predictive ability of the models decreased, which indicated that the current tree and stand conditions were the best predictors of growth and wood properties up to five years prior to sampling. This study suggests that crown length equal to 2/3 of the tree height might represent an optimal balance between radial growth and wood quality.

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Section: Discussionsupporting

confidence: 54%

White Spruce Growth and Wood Properties over Multiple Time Periods in Relation to Current Tree and Stand Attributes

Cortini

MacIsaac

Comeau

2016

Forests

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“…Many studies have shown that stem shape is a good indicator of wood quality both for individual trees and for entire stands (Roth et al 2007, Lasserre et al 2009, Lindstrom et al 2009, Lenz et al 2012, Searles 2012, Pretzsch and Rais 2016. It is important to use indicators that are easy to measure; one such is the height-to-diameter ratio or slenderness (Pretzsch and Rais 2016), which has yielded good results for predicting wood quality in previous studies (Reukema and Smith 1987, Kijidani et al 2009, Lindstrom et al 2009. In our study, there was a strong correlation between wood quality and slenderness (Fig.…”

Section: Relationship Between Slenderness (The Height-to-diameter Ratsupporting

confidence: 62%

Predictors of Wood Quality of Trees in Primary Forests in the Southern Carpathians

Chivulescu¹,

Leca²,

Ciceu³

et al. 2019

AgricultForest

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Functional mechanisms in primary forests can help us discover structural models that can be applied to managed forests. Wood quality is important in silviculture because it influences timber price. Using the structure and tree form of primary forests in the Southern Carpathians as a model, our research objectives were to determine the relationships between wood quality and factors such as coenotic position of trees, the ratio of diameter at breast height (DBH) to tree height, and tree slenderness. Wood quality was strongly related to the coenotic position of trees (r = 0.89*-0.99***); suppressed (or dominant) trees had higher quality wood than dominant (or suppressed) trees. Wood quality and slenderness were also highly correlated (r = 0.56-0.95***) in most plots-the more slender the tree, the lower its wood quality. We found that trees with the highest quality wood were in the 30-100 cm DBH range. Therefore, DBH is a reliable predictor of wood quality for uneven-aged forests, providing quick results with little effort.

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“…The hypothesis that the stem's biomechanical requirements influence wood density is supported by the widely observed relationship of stem slenderness to wood density (Lindström 1996b, Groot and Cortini in review) and to wood stiffness (Lei et al 2005, Roth et al 2007, Warren et al 2009, Kijidani et al 2010, Lowell et al 2014. Although stems of low slenderness (high taper) and wide rings are both associated with large crowns, the inconsistent influence of ring width on wood density suggests that association between slenderness and wood density may not be simply correlative.…”

Section: Progress In Predicting Wood Density From Crown Characteristicsmentioning

confidence: 99%

Crown-fibre attribute relationships for enhanced forest inventory: Progress and prospects

Groot¹,

Cortini

Wulder

2015

The Forestry Chronicle

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A five-year project, Crown-Fibre Attribute Relationships (CFAR), was completed by the Canadian Wood Fibre Centre (Natural Resources Canada) to explore the relationships between tree crown characteristics and wood fibre attributes. The CFAR project used a number of data sets distributed across Canada (e.g., silvicultural experiments), providing a range of crown conditions following spacing and thinning treatments. The approaches developed under the CFAR project, along with other relevant research, indicate that is possible to enhance current forest inventories by providing estimates of fibre attributes from crown characteristics of individual trees that can, or are poised to be, captured using remotely sensed data. Predictability was related to the dimensionality of the fibre attributes with models for zero-dimensionality fibre attributes (e.g., DBH) showing RMSE of 10% to 15% of mean values. Also, one-dimensional (e.g., sapwood area) and two-dimensional (i.e., ring area) models quantified longitudinal patterns with low bias. Current values of wood density were not related to crown characteristics; instead, recent research suggests that wood density is regulated by hydraulic and biomechanical constraints. Further evolution of remote sensing technology and related research will help to address the temporal problem posed by two-and three-dimensional fibre attributes.Key words: Canadian Wood Fibre Centre, crown-fibre attribute relationships, DBH, maximum branch diameter, sapwood area, ring area, wood density, tree crown, LiDAR RÉSUMÉUn projet d'une durée de cinq ans portant sur les relations entre la cime des arbres et les qualités de la fibre a été complété par le Centre canadien sur la fibre de bois (Ressources naturelles Canada) et avait pour objectif d' étudier les relations entre les caractéristiques de la cime des arbres et les qualités de la fibre du bois. Le projet a utilisé plusieurs ensembles de données provenant d'un peu partout au Canada (par ex., des expériences sylvicoles) et représentant plusieurs conditions de cime à la suite de traitements de dégagement et d' éclaircie. Les approches élaborées dans le cas de ce projet, ainsi qu'au cours de travaux de recherche connexes, indiquent qu'il est possible d'améliorer les inventaires forestiers actuels en ajoutant un estimé des qualités de la fibre à partir des caractéristiques de la cime de chaque arbre qui peut être, ou qui serait sur le point d' être saisies par télédétection. La prévisibilité a été liée à la dimensionnalité des qualités de la fibre ayant des modèles sans dimensionnalité (par ex., dhp) et affiche une erreur quadratique moyenne (RMSE) de 10% à 15%. De plus, des modèles unidimensionnels (par ex., la surface de l'aubier) et des modèles à deux dimensions (par ex., la surface des anneaux de croissance) ont permis de quantifier les profils longitudinaux avec un faible biais. Les valeurs actuelles de la densité du bois n' ont pas été reliées aux caractéristiques des cimes, mais cependant, une recherche récente laisse entendre que la den...

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Effect of height-to-diameter ratio on stem stiffness of sugi (Cryptomeria japonica) cultivars

Cited by 18 publications

References 11 publications

White Spruce Growth and Wood Properties over Multiple Time Periods in Relation to Current Tree and Stand Attributes

White Spruce Growth and Wood Properties over Multiple Time Periods in Relation to Current Tree and Stand Attributes

Predictors of Wood Quality of Trees in Primary Forests in the Southern Carpathians

Crown-fibre attribute relationships for enhanced forest inventory: Progress and prospects

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