Effect of air-dry density and some anatomical features on transverse shrinkage of Melia azedarach L. wood
Keywords:
Tangential shrinkage, , radial shrinkage, wood density, Melia azedarachAbstract
Variation in transverse shrinkage (radial and tangential shrinkages) from pith to bark and the relationships between transverse shrinkage with air-dry density and some anatomical features of 10 - year-old Melia azedarach planted in Thai Binh province, Vietnam were examined. Wood samples with dimensions of 30 (radial) × 30 (tangential) × 5 (longitudinal) mm were cut at the ring number 2, 4, 6 and 8 from logs cut at 1.3m above the ground according to Japanease industrial standard (JIS Z2101 - 1994). The mean values of radial and tangential shrinkages were 4.40 and 7.04%. The tangential/radial shrinkage ratio was 1.62. In radial direction, both radial and tangential shrinkages have a trend of gradually increasing from pith to bark. Fiber cell wall thickness and vessel lumen diameter have positive relationships with transverse shrinkage. Radial and tangential shrinkages were increasing when the air-dry density increasing. The coefficients of correlation between air-dry density and radial shrinkage was 0.78 (P < 0.01), while this correlation between air-dry density and tangential shrinkage was 0.56 (P < 0.01)
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