Hygroscopicity of Decayed Wood: Implications for Weight Loss Determinations
Keywords:Hygroscopicity, wood decay, brown rot, white rot, soft rot, weight loss
AbstractHygroscopicity changes were observed in red maple blocks subjected to brown rot, white rot, and soft rot. Brown rot reduced hygroscopicity, soft rot increased hygroscopicity, and white rot showed no change in hygroscopicity. The effect of these changes on weight loss tests when using moisture-conditioned block weights is a slight overestimation of weight loss for brown rot, a slight underestimation for soft rot, and no apparent change for white rot. When comparing changes in hygroscopicity prior to oven-drying with those observed after oven-drying, there were no differences for white rot and soft rot, while for brown rot, the reduction in hygroscopicity was enhanced by oven-drying.
American Society For Testing and Materials (ASTM). 1981. Accelerated laboratory test of natural decay resistance of woods. Standard D-2017. ASTM Book of Standards Section 4, Philadelphia, PA.nAnagnost, S. E., and W. B. Smith. 1997. Comparative decay of red maple heartwood and sapwood. Wood Fiber Sci. 29(2): 189-194.nButcher, J., and T. Nilsson. 1982. Influence of variable lignin content amongst hardwoods on soft-rot susceptibility and performance of CCA preservatives. The International Research Group on Wood Preservation Document No. IRG/WP/1151, Stockholm, Sweden.nCartwright, K. St. G., and P. K. Findlay. 1946. Decay of timber and its prevention. His Majesty's Stationary Office, London, UK.nChristensen, G. M., and K. E. Kelsey. 1959. The sorption of water vapor by the constituents of wood. Holz Roh Werkst. 17(5):189-202.nCowling, E. B. 1961. Comparative biochemistry of the decay of sweetgum sapwood by white-rot and brownrot fungi. USDA Forest Serv. Tech. Bull. No. 1258, Madison, WI. 79 pp.nEslyn, W. E., T. K. Kirk, and M. J. Effland. 1975. Changes in the chemical compostition of wood caused by six soft-rot fungi. Phytopathology 65:473-476.nFlournoy, D. S., T. K. Kirk, and T. L. Highley. 1991. Wood decay by brown rot fungi: Changes in pore structure and cell wall volume. Holzforschung 45(5):383-388.nJones, H. L., and J. J. Worrall. 1995. Fungal biomass in decayed wood. Mycologia 87(4):459-466.nKirk, T. K., and T. L. Highley. 1973. Quantitative changes in structural components of conifer woods during decay by white- and brown-rot fungi. Phytopathology 63:1338-1342.nNilsson, T., and G. Daniel. 1992. On the use of % weight loss as a measure for expressing results of laboratory decay experiments. The International Research Group on Wood Preservation Document No. IRG/WP/ 2394-92, Stockholm, Sweden.nSrebotnik, E., and K. Messner. 1991. Immunoelectron microscopical study of the porosity of brown-rot degraded pine wood. Holzforschung 45(2):95-101.nWindandy, J. E., and J. J. Morrell. 1993. Relationship between incipient decay, strength, and chemical composition of Douglas-fir heartwood. Wood Fiber Sci. 25(3):278-288.nWorrall, J. J., S. E. Anagnost, and R. A. Zabel. 1997. Comparison of wood decay among diverse lignicolous fungi. Mycologia 89(2):(in press).nZabel, R. A., and J. J. Morrell. 1992. Wood microbiology. Academic Press, Inc., San Diego, CA. 476 pp.n
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