Journal ArticleDOI
Influence of provenance variation on wood properties of teak from the western ghat region in india
K. M. Bhat,P.B. Priya +1 more
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In this paper, the three major teak provenances of the Western Ghats in India were characterised in terms of mechanical and anatomical wood properties, and a trend for bending stiffness (modulus of elasticity) and maximum stress of the timber to be highest towards the southernmost geographic location (Konni) within the latitudinal range of 9° to 15° S with a greater percentage of cell wall, despite the slower growth rate and well defined ring-porosity with wider bands of earlywood parenchyma tissue.Abstract:
The three major teak provenances of the Western Ghats in India were characterised in terms of mechanical and anatomical wood properties. Within the same age of 21-year-old plantations, teak from the North Kanara provenance, generally known to display slow growth, had the lower values of static bending (modulus of rupture and modulus of elasticity) and longitudinal compressive stresses than the Malabar provenance (Nilambur). The weaker timber of North Kanara provenance was attributed to its relatively high percentage of parenchyma and low percentage of fibres in the narrower rings, probably as an adaptation to nutrient-rich soil condition. Observations of 65-year-old plantations reveal that there was a trend for bending stiffness (modulus of elasticity) and maximum stress (modulus of rupture) of the timber to be highest towards the southernmost geographic location (Konni) within the latitudinal range of 9° to15° S with a greater percentage of cell wall (with higher lignification) despite the slower growth rate and well defined ring-porosity with wider bands of earlywood parenchyma tissue. The study thus underlines the need to recognise the provenance source of variation to explain the varied growth-structure-property relationships of teak and to utilise the Indian genetic resources to the optimum in future teak improvement programmes.read more
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Wood properties of teak (Tectona grandis) from a mature unmanaged stand in East Timor
TL;DR: In this article, the wood properties of 50- to 70-year-old Tectona grandis trees from an unmanaged forest in East Timor were assessed and compared to plantations of other origin: 607 kg/m3 basic density, 3.5% and 5.2% radial and tangential shrinkage.
Journal ArticleDOI
Diversity and genetic structure of teak (Tectona grandis L.f) in its natural range using DNA microsatellite markers
TL;DR: Analysis of the genetic variability and structure of 166 teak trees distributed over the whole natural area of teak showed that in the teak natural area there were four main centers of genetic variability, and the use of SSR markers for conservation of Teak forest diversity is discussed.
Journal ArticleDOI
Radial variations in the anatomical characteristics and density of the wood of Acacia mangium of five different provenances in Indonesia
Widyanto Dwi Nugroho,Widyanto Dwi Nugroho,Sri Nugroho Marsoem,Koh Yasue,Takeshi Fujiwara,Toshiko Nakajima,Masanori Hayakawa,Satoshi Nakaba,Yusuke Yamagishi,Hyun-O Jin,Takafumi Kubo,Ryo Funada,Ryo Funada +12 more
TL;DR: The authors' observations suggest that Sidei and Daintree might be more appropriate provenances among those examined for the Acacia mangium tree-breeding programs in Indonesia that are aimed at improving wood quality, because these provenances are associated with longer initial wood fibers and narrower juvenile areas than the other provenances studied.
Journal ArticleDOI
Provenance effect on the ring structure of teak (Tectona grandis L.f.) wood by X-ray microdensitometry
TL;DR: In this paper, the authors proposed a method to obtain information about provenance variation of basic wood properties in order to preserve the wood quality of end-products derived from future plantations.
Journal ArticleDOI
Testing implicit assumptions regarding the age vs. size dependence of stem biomechanics using Pittocaulon (Senecio) praecox (Asteraceae)
Julieta A. Rosell,Mark E. Olson +1 more
TL;DR: It is shown that the allometric and mechanical properties observed across microsites are uniform despite great plasticity in other features (e.g., size and wood anatomy) and suggested that this uniformity is an example of developmental homeostasis.
References
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Journal ArticleDOI
Characterisation of juvenile wood in teak
TL;DR: Fibre length, microfibrillar angle, vessel diameter/percentage and ring width appear to be the best anatomical indicators of age demarcation between juvenile and mature wood, although maturation age often varies among the properties.
Journal ArticleDOI
Influence of Rainfall, Irrigation and Age on the Growth Periodicity and Wood Structure in Teak (Tectona Grandis)
P.B. Priya,K. M. Bhat +1 more
TL;DR: Irrigation of 5-year-old trees led to the loss of typical ring porosity of teak wood; their first three growth rings were more or less diffuse-porous and this was attributed to uninterrupted cambial activity resulting in production of rather uniform-sized vessels.
Journal Article
Timber quality of teak from managed tropical plantations with special reference to Indian plantations.
TL;DR: La qualite des bois de teck a croissance rapide suscite un interet grandissant dans le developpement recent des plantations commerciales dans la plupart des pays tropicaux, la qualite de ces bois ont ete choisis afin de faciliter le controle de leurs proprietes.
Journal Article
The Effect Of Ray Tissue On The Specific Gravity Of Wood
TL;DR: In this paper, a method of estimating the specific gravity of rays from measurements on the relative amount of cell wall substance is described, and estimated specific gravities are reported for the rays of several species.
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Wood Anatomical Changes in Juvenile Teak due to Insect Defoliation
P. B. Priya,K. M. Bhat +1 more
TL;DR: No intrinsic relationship could be established between the insect defoliation and the formation of false rings and no significant differences were found in specific gravity, cell wall percentage and diameter and percentage of vessels.