Wood durability of home-garden teak against brown-rot and white-rot fungi |
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Authors: | K M Bhat P K Thulasidas E J Maria Florence K Jayaraman |
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Institution: | (1) Division of Forest Utilisation, Kerala Forest Research Institute, Peechi, 680 653, Kerala, India;(2) Division of Extension and Training, Kerala Forest Research Institute, Peechi, 680 653, Kerala, India;(3) Division of Forest Information Management System, Kerala Forest Research Institute, Peechi, 680 653, Kerala, India |
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Abstract: | Natural decay resistance of teak wood grown in home-garden forestry and the factors influencing decay resistance were determined
in comparison with that of a typical forest plantation. Accelerated laboratory tests were conducted on 1800 wood samples drawn
from 15 trees of three planted sites. Analysis of variance based on a univariate mixed model showed that planted site, fungal
species, and their interaction terms were important sources of variation in decay resistance. With increasing decay resistance
from centre to periphery of the heartwood, radial position was a critical factor and the interaction effect of fungal species
× radial position was significant in influencing the durability. No significant differences were found in decay resistance
either between the opposite radii or due to the various possible interaction terms of radii with the site, fungal species
and radial position. There were significant differences in decay resistance against brown-rot fungi between wet and dry sites
of home-garden teak although differences against white-rot fungi were non-significant among the three planted sites. Polyporus palustris was the more aggressive brown-rot fungus than Gloeophyllum trabeum. The higher susceptibility of wet site home-garden teak to brown-rot decay was associated with a paler colour of the wood
and lower extractive content. |
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Keywords: | Tectona grandis Decay resistance Extractive content Wood colour Mixed effects model Trees outside forest |
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