Microfibril Angles in the S2 layer of tracheids in Root and Stem Wood of Chamaecyparis obtusa: Prediction of microfibril angle of mature wood in the stem from root wood

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Other Title
  • ヒノキ根材と幹材における仮道管Ｓ２層ミクロフィブリル傾角の変動　　根材を使った幹の成熟材部ミクロフィブリル傾角の予測可能性
  • ヒノキ コンザイ ト カンザイ ニ オケル カドウカン S2ソウ ミクロフィブリルケイカク ノ ヘンドウ コンザイ オ ツカッタ ミキ ノ セイジュクザイブ ミクロフィブリルケイカク ノ ヨソク カノウセイ
  • Prediction of microfibril angle of mature wood in the stem from root wood
  • 根材を使った幹の成熟材部ミクロフィブリル傾角の予測可能性

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Description

The variation of microfibril angle (MFA) of the S2 layer in latewood tracheids was investigated in the root and stem woods of Chamaecyparis obtusa. MFA at breast height became stable near the 20th growth ring. The stable value of MFA was reached earlier with increasing height above the ground and at 8 m height MFA became stable near the 10th growth ring. However, there was little difference between stable values at different heights in the tree. MFA in root wood became stable near the 10th ring without regard to the distance from basal part to root tip. There was also little difference between stable values of MFA according to root wood diameter. Using the root wood at 20 cm from the basal part, which it is easy to take, prediction of MFA of mature wood in the stem was possible. There was a significant correlation at the 1% level between stable MFAs in root and stem. There was also a significant rank correlation at the 1% level. There was a significant correlation at the 0.1% level between MFA in the 18th to 20th ring of root wood and MFA of mature wood in the stem, but early prediction was difficult because the correlation coefficient decreased in young growth rings. On the other hand, it was suggested that it is possible to predict MFA of mature wood in the stem using the outer part of root wood larger than 40 mm in diameter.

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 51 (3), 141-145, 2005

    The Japan Wood Research Society

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