Provenance effect on the ring structure of teak (Tectona grandis L.f.) wood by X-ray microdensitometry
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Teak (Tectona grandis L.f.) is a tropical timber which is appreciated worldwide and has been planted into many regions of the tropics. It is essential to obtain information about provenance variation of basic wood properties in order to preserve the wood quality of end-products derived from future plantations. Figuring is one of the wood characteristics valued for panelling and furniture and it is an important parameter to evaluate the quality of teak wood. The ring structure affects within-ring and between-ring colour variation and, therefore, the figure of wood and the related aesthetical aspects.
By means of microdensity profiles, we constructed a segmented linear model that depicts the anatomical structure of the rings. It effectively distinguished ring porous and diffuse porous rings, leading to the development of an efficient ring porosity index, further used to study the provenance variation of the ring structure.
A significant provenance effect was detected for both wood density variables and ring anatomical structure. Although no correlation was detected between the ring structure and the precipitation level at the provenance origin, the two provenances from very wet climates were distinguished by low values of ring porosity index (diffuse porous ring).
The progenies in our study, collected from origins with various climates, planted in a new climate, seem to maintain to some extent the wood characteristics typical of their mother trees, suggesting that these ring characteristics may be inherited.
KeywordsTectona grandis Wood anatomy Aesthetic value Wood quality Provenances
The authors want to thanks Philippe Vigneron of CIRAD, coordinator of the EU project WAFT, Joe Cobbinah of FORIG in Kumasi (Ghana) for the support on the on-site sampling, Paulo Ricardo Gherardi Hein and Luciano Scaletti for the specimens processing and Frédéric Millier for X-Ray scanning.
The work was done in the framework of the EU INCO-DEV Project “WAFT—Increasing productivity and quality of West Africa teak plantations using genetic diversity and sustainable management”.
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