Assessment of decay risk of airborne wood-decay fungi

点击翻译按钮获取中文摘要

The decay risk of airborne wood-decay fungi was investigated by using an air sampler. Japanese cedar disks with moisture content at about 100% were placed in a "BIOSAMP" air sampler and exposed to 1, 000 liters of air. The disks were then incubated for 16-20 weeks in a damp container kept at 26℃. To investigate factors affecting mass loss%, relationship between wood characteristics and mass loss% were analyzed. Wood moisture content and ratio of heartwood area proved to be significant factors. Disks that were sampled on a cloudy day showed significantly higher mean mass loss% compared to those sampled on a sunny day. Taxa or species were determined from DNA sequences extracted from fungi grown on the cedar disk. Statistical analysis revealed, in the case of Tsukuba, related species of P. sordida play an important role in increasing the decay risk caused by airborne wood-decay fungi. It is proved that there was no significant difference between the decay risk of airborne fungi in Tsukuba and in Sapporo. This research reveals that there are same decay risk between the houses with exterior thermal insulation in Hokkaido and other areas.