Effect of cutting season on biodeterioration in madake (Phyllostachys bambusoides)
2003
Hirano, Y. (Tokyo Univ. (Japan)) | Shida, S. | Arima, T.
According to traditional technicians and producers of bamboo, the season of cutting bamboo culms affects their durability, i.e., their resistance against insects and fungi when used as architectural members. We used madake (Phyllostachys bambusoides Sieb. et Zucc.) as test samples, which were cut once every month in Kyoto and Kagawa to investigate the appropriate cutting season scientifically. The extent of fungi on the surface of the specimens and relative weight loss after seasoning for 4 and 8 months at 20?@deg C and 98%RH were determined to evaluate the biodeterioration of madake. The results are summarized as follows : (1) The extent of fungi on the specimen surface after seasoning at 20 deg C and 98%RH was low from July to September. (2) Monthly changes of relative weight loss after treatment with boiling water differed according to locality of origin. (3) The equilibrium moisture content of specimens was low from August to October. (4) The starch content of samples was very low from July to September and showed a maximum value in the sample from May. (5) The relative weight loss after treatment with boiling water had high values when starch content was increasing and low values when starch content was decreasing. (6) There was a lag of two months concerning the appropriate cutting season between the results obtained in this report and traditional wisdom. The reason is thought to be that summer is the worst season for storage of bamboo and that traditional wisdom includes the effects of the storage environment.
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