篳篥の蘆舌に用いられる葦(<i>Phragmites australis</i>)材の物性(第1報):材内の密度分布と稈の横圧縮強度  [in Japanese] Physical Properties of the Reed (<i>Phragmites australis</i>) Used for the Vibrating Plate of the Japanese Oboe (Hichiriki) I:Density variation in the culm and compressive strength in the transverse direction  [in Japanese]

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Abstract

<p>雅楽に用いられる篳篥のリード(蘆舌)には葦(<i>Phragmites australis</i>)が用いられる。蘆舌には淀川流域の鵜殿地区で採れる葦が最適とされているが,その理由は定かではない。本研究では,代替産地や合理的な選別法を検討する上で不可欠な良材の条件を明らかにするために,熟練者によって選別された葦材の組織構造,密度および横圧縮強度を他の葦のそれらと比較した。同一節間内で比較すると,上部ほど肉薄で密度が高かった。この違いは外皮の内側にある柔細胞層の厚さの違いによるものであった。良材と選別された葦材は,他の葦よりも肉厚でやや密度が高かったが,その差は僅少であった。一方,良材は他の葦よりも明らかに高い横圧縮強度を示した。葦の稈から蘆舌を作る際には,稈の一端をつぶさなければならない。そのため,薄くつぶしやすい節間内上部が使われ,かつ,横圧縮に対して壊れにくい葦材が選ばれるものと推察された。</p>

<p>Hichiriki is a traditional Japanese oboe used for Japanese ancient court music (Gagaku). The vibrating plate (Rozetsu) of the hichiriki is made from a reed (<i>Phragmites australis</i>), and the best reed is believed to be harvested in the Udono area along the Yodogawa river. In this study, we observed the anatomical structure of reeds selected by experts, and measured their density and transverse compressive strength to clarify the basic requirements for quality instruments. Within an internode, the upper part was always thinner and denser than the lower part, depending on the thickness of the low-density parenchyma layer beneath the cortex. Selected reed was slightly thicker and denser than unselected reed, but those differences were not significant. On the other hand, the transverse compressive strength of selected reed was significantly greater than that of unselected reed, and the upper part showed the highest strength. It is considered that sufficient transverse strength is required while the thinner, i.e. deformable upper part is preferred, because an end of the reed culm is compressed to form the closed end of the double-reed. With respect to shape, density and compressive strength, the Mukaijima area along the Uji river is a potential field to harvest reeds for hichiriki.</p>

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 62(6), 259-265, 2016

    The Japan Wood Research Society

Codes

  • NII Article ID (NAID)
    130005170576
  • NII NACSIS-CAT ID (NCID)
    AN00240329
  • Text Lang
    JPN
  • ISSN
    0021-4795
  • NDL Article ID
    027759548
  • NDL Call No.
    Z17-484
  • Data Source
    NDL  J-STAGE 
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