Influence of wood moisture content and wood temperature on fungal decay in the field: observations in different micro-climates |
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Authors: | Christian Brischke Andreas Otto Rapp |
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Institution: | 1.Institute of Vocational Sciences in the Building Trade (IBW),Leibniz University Hannover,Hannover,Germany |
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Abstract: | In this study, Scots pine sapwood (Pinus sylvestris L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco) specimens were exposed in double layer field trials at four different exposure sites and under different exposure
conditions (in total ten test sets). The material climate of wood in terms of wood moisture content (MC) and wood temperature
was automatically monitored over a period of 6 years and compared with the progress of decay. The aim of this study was to
highlight the interrelationship between microclimate, material climate, and decay as a basis for the establishment of dose-response
functions to be used for service life prediction of wood and wood-based products. Differences in resulting decay dynamics
between the test sites as well as between the different types of exposure were quantified and discussed with respect to corresponding
microclimatic and material climatic conditions. The time between the beginning of exposure and the first occurrence of visible
decay varied between the sites and influenced the total decay development. The fundamental importance of direct decay factors,
such as MC and wood temperature, were underlined and basic requirements for establishing dose-response-functions to be used
in service life prediction models were derived. |
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