The effect of bark decortication for hiwada production on xylem and phloem formation in Chamaecyparis obtusa |
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Authors: | Yasuhiro Utsumi Shinya Koga Naoaki Tashiro Atsushi Yamamoto Yukie Saito Takanori Arima Hirokazu Yamamoto Masahiko Kadomatsu Nao Sakanoue |
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Institution: | (1) Department of Forest and Forest Products Sciences, Graduate School of Agriculture, Kyushu University, 949 Okawachi, Shiiba, Miyazaki 883-0402, Japan;(2) Department of Biomaterials Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan;(3) Miyazaki Prefectural Wood Utilization Research Center, Miyakonojo 885-0037, Japan;(4) University Forest in Chiba, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Kamogawa 299-5503, Japan;(5) Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0003, Japan;(6) Field Science Education and Research Center, Kyoto University, Kyoto 606-8502, Japan |
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Abstract: | Of all plant materials used to cover the roofs of traditional Japanese buildings, Japanese cypress (Chamaecyparis obtusa) bark, hiwada, has the longest service life and has been used from ancient times. However, wood and bark properties after hiwada harvest have not been evaluated in detail. We studied whether decortication for hiwada production in winter affected xylem and phloem formation. Decorticated trees still preserved all inner bark and part of the
outer bark, and both decorticated and control trees had similar annual ring structures at all stem heights in the xylem and
phloem. In both xylem and inner bark, no significant difference in ring width at any stem height was found between annual
rings before and after decortication. Thus, this study revealed that the decortication of bark for hiwada production does not affect the formation of xylem and the inner and outer bark if decortication is carried out by highly
skilled workers in winter. |
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Keywords: | Chamaecyparis obtusa Hiwada Bark Xylem formation Phloem formation |
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