Assessment of decay risk of airborne wood-decay fungi |
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Authors: | Ikuo Momohara Yuko Ota Takeshi Nishimura |
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Institution: | 1. Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki, 305-8687, Japan
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Abstract: | The decay risk of airborne wood-decay fungi was investigated by using an air sampler. Japanese cedar disks 7.8 cm in diameter
and about 3 mm in thickness with moisture content of about 100% were placed in a “BIOSAMP” air sampler and exposed to 1000
l air. Air sampling was carried out from June to September at the same sampling site in Tsukuba, Japan. The exposed disks
were then incubated for 16 weeks in a damp container kept at 26° ± 2°C. During the incubation period, wood mass loss ranged
from −15 to 807 mg with a mean mass loss of 244 mg. Factors affecting mass loss were explored. Wood moisture content and ratio
of heartwood area proved to be significant factors. In addition, six weather factors were found to influence mass loss. Disks
that were sampled on a cloudy day showed significantly higher mean mass loss compared to those sampled on a sunny day. Subculturing
of filamentous fungi from 16-week incubated disks suggested one-third of the isolated fungi produced ligninolytic enzymes. |
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