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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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Journal of Forestry Research 2005年第2期16卷 83-88页

作者： WUYi-qiang HAYASHIKazuo LIUYuan CAIYing-chun SUGIMORIMasatoshi LUOJian-ju FacultyofAgriculture EhimeUniversityMatsuyama790-8566Japan FacultyofAgriculture EhimeUniversityMatsuyama790-8566Japan／／CollegeofIndustryCentralSouthForestryUniversityChangsha410000P.R.China CollegeofIndustry CentralSouthForestryUniversityChangsha410000P.R.China CollegeofMaterialScienceandEngmeenng NortheastForestryUniversityHarbin150040P.R.China CollegeofForestry GuangxiUniversityNanning530000P.R.China

collapse-type shrinkage is one of highly refractory drying defects inlow-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 withcollapse-type shrinkage characteristics, were investigated by using simple regression method forthree species of collapse-susceptible Eucalyptus urophyll,, E. grandis and E. ***,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 strongpositive 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 notable to be predicted ideally by any examined factors alone owing to lower R^2 value (R^2≤0.5712);residual collapse was negatively correlated with BD and DWT, linearly positively correlated withMFA, and had strongly positive linear correlation with RP. It is concluded that BD can be used assingle factor (R^2≥ 0.9412) to predicate unit cell wall shrinkage and RP is the relatively soundindicator for predicting residual collapse

关键词： basic density microfibril angle double fibre cell wall thickness proportion of ray parenchyma unit cell wall shrinkage total shrinkage residual collapse eucalyptplantation

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