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Collapse-type shrinkage characteristics in plantation-grown eucalypts: I. Correlations of basic density and some structural indices with shrinkage and collapse properties

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Abstract

Collapse-type shrinkage is one of highly refractory drying defects in low-medium density plantation-grown eucalypt wood used as solid wood products. Basic density (BD), microfibril angle (MFA), double fibre cell wall thickness (DWT), proportion of ray parenchyma (RP), unit cell wall shrinkage, total shrinkage and residual collapse, which are associated with collapse-type shrinkage characteristics, were investigated by using simple regression method for three species of collapse-susceptibleEucalyptus urophyll,, E. grandis andE. urophylla×E.grandis, planted at Dong-Men Forest Farm in Guangxi autonomous region, China. The results indicated that: unit cell wall shrinkage had a extremely strong positive correlation with BD, moderately strong positive correlation with DWT, and a weakly or moderately negative correlation with RP and MFA; total shrinkage was positively correlated with BD, DWT and RP and negatively related to MFA, but not able to be predicted ideally by any examined factors alone owing to lower R2 value (R2≦0.5712); residual collapse was negatively correlated with BD and DWT, linearly positively correlated with MFA, and had strongly positive linear correlation with RP. It is concluded that BD can be used as single factor (R2≥0.9412) to predicate unit cell wall shrinkage and RP is the relatively sound indicator for predicting residual collapse

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Authors and Affiliations

  1. Faculty of Agriculture, Ehime University, 790-8566, Matsuyama, Japan

    Wu Yi-qiang, Hayashi Kazuo &  Masatoshi

  2. College of Industry, Central South Forestry University, 410000, Changsha, P.R. China

    Wu Yi-qiang & Liu Yuan

  3. College of Material Science and Engineering, Northeast Forestry University, 150040, Harbin, P.R. China

    Cai Ying-chun

  4. College of Forestry, Guangxi University, 530000, Nanning, P.R. China

    Luo Jian-ju

Authors
  1. Wu Yi-qiang
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  2. Hayashi Kazuo
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  3. Liu Yuan
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  4. Cai Ying-chun
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  5. Masatoshi
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  6. Luo Jian-ju
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Correspondence to Wu Yi-qiang.

Additional information

Foundation item: This work was supported by both the project (No. 30170754) from Chinese National Natural Science Fund and the national significant fundamental research ‘Ascending Plan’ program (No.95-07) authorized by Ministry of Science and Technology, China. And was partly presented at the 54th Annual Meeting of the Japan Wood Research Society in Hokkaido, Japan and at the 7th Pacific Rim Bio-based Composites Symposium in Nanjing, P. R. China

Biography: WU Yi-qiang (1967-), male, Ph.D., associate professor in Central South Forestry University, Changsha 410000, P.R. China; Present: Doctoral student in Ehime University, Matsuyama 790-8566, Japan.

Responsible editor: Song Funan

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Yi-qiang, W., Kazuo, H., Yuan, L. et al. Collapse-type shrinkage characteristics in plantation-grown eucalypts: I. Correlations of basic density and some structural indices with shrinkage and collapse properties. Journal of Forestry Research 16, 83–88 (2005). https://doi.org/10.1007/BF02857895

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  • DOI: https://doi.org/10.1007/BF02857895

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