<i>Relationship between growth strain and rate of growth in 22 year-old</i>Eucalyptus grandis

Wilkins, A. P.; Kitahara, Ryushi

doi:10.1080/00049158.1991.10674562

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…This finding concurs with previous data showing that growth stress is not affected by growth rate in fast-growing species younger than 15 years. 8,9,14 Because planted eucalypts with large diameters are reported to have lower released strain, 16 Fig. 2 could be interpreted as showing that trees larger than 30 cm in diameter had lower strain, although the difference is statistically insignificant.…”

Section: Resultsmentioning

confidence: 99%

Heart splitting at crosscutting of eucalypt logs

Okuyama

Doldán²,

Yamamoto

et al. 2004

J Wood Sci

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The occurrence of heart splitting during the crosscutting of logs was discussed in relation to the released strain on Eucalyptus spp. logs. The strains released in the longitudinal and tangential directions were measured by the strain-gauge method and were correlated with the length of the heart split measured on the same logs. There were differences in the longitudinal strain; however, no significant correlation was found with the diameter that could be converted to a mean annual increment (i.e., a relation with the growth rate). The initial splits expand with the time after felling. The longer the initial split, the longer is the length 1 week after felling. The split length was significantly smaller at the butt end of the first log of every tree than at the other end, but there were no significant differences between the split length at the top of the first logs and at either end of the second logs, although there were differences among individual trees. The length of the heart split correlated with the released strain near the pith, which was estimated using Kubler's equation. The longitudinal released strain measured on the surface of logs is a good indicator of the heart splitting when crosscutting logs.

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Section: Resultsmentioning

confidence: 99%

Heart splitting at crosscutting of eucalypt logs

Okuyama

Doldán²,

Yamamoto

et al. 2004

J Wood Sci

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“…While peripheral tensile stresses are present in upright trees (Timell 1987;Wilkins & Kitahara 1991) such stresses can be considered to be in equilibrium and as prestressing in the tree stem. If however the stems are bent, it is suggested that the reaction wood mechanisms as outlined above will come into play and right the stem.…”

Section: How Trees Stay Uprightmentioning

confidence: 99%

A General Theory for the Origin of Growth Stresses in Reaction Wood: How Trees Stay Upright

Bamber¹

2001

IAWA J

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A general theory for the origin of growth stresses in the reaction wood of trees is presented. In both gymnosperms and arboreal dicotyledons, stress is considered to arise from the cellulosic component of the wood. It is suggested that in gymnosperms, cellulose microfibrils behave as helical springs. The helical springs are thought to be laid down in a compressed state and thus exert a compressive force which acts to right or stabilise the tree.In arboreal dicotyledons the cellulose microfibrils are laid down as extended, longitudinally oriented springs and thus exert a tensile force tending to right or stabilise the tree.Contrary to the prevailing view, lignin is not considered to be involved in the generation of growth stress in reaction wood. It is suggested that the sole function of lignin is to cement the cellulosic constituents into a whole, thus ensuring the transmission of stresses through the wood. The low values of lignin often reported from tension wood and especially from gelatinous fibres is seen as a mechanism to facilitate the contraction of microfibils thus maximising longitudinal tensile stress. The high values of lignin in of compression wood is seen as a mechanism to increase the compressive strength of compression wood.

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“…However, work on growth stresses in tropical forest species is limited. From the literature, it is evident that growth stress and growth rate are not related (Boyd, 1980;Okuyama et al 1981;Wilkins & Kitahara, 1991;Wahyudi et al, 1999Wahyudi et al, , 2000Wahyudi et al, & 2001. Growth stress was not related to either tree age or diameter (Jacob, 1945).…”

Section: Introductionmentioning

confidence: 99%

Growth Strains inAcacia AuriculaeformisTrees of Different Age: Their Relationship with Growth Rate and Height

Aggarwal¹,

Chauhan²,

Karmarkar³

2006

Journal of the Institute of Wood Science

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Longitudinal Growth Strains in Acacia auriculaeformis were measured to understand the influence of growth rate and tree height on growth stresses. A total of 18 trees of Acacia auriculaeformis were sampled from three age classes viz. 8 year, 10 year and 12 year old plantations (six trees from each plantation). A significant difference was observed in growth strains within trees at different heights and in trees of different age classes. Magnitude of growth strain was found to increase initially with tree height up to 3 m and subsequently declined. The trend was similar in trees of all the three age classes. There was a moderate relationship of growth strain with diameter increment rate, which needs to be confirmed with a large sample size.

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Relationship between growth strain and rate of growth in 22 year-oldEucalyptus grandis

Cited by 11 publications

References 9 publications

Heart splitting at crosscutting of eucalypt logs

Heart splitting at crosscutting of eucalypt logs

A General Theory for the Origin of Growth Stresses in Reaction Wood: How Trees Stay Upright

Growth Strains inAcacia AuriculaeformisTrees of Different Age: Their Relationship with Growth Rate and Height

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