Skip to main content

Table 4 Model parameter means and standard errors (SE), F ratios and the significance of differences among the means for three sampled sites for air-dry density (wood density), microfibril angle (MFA) and dynamic modulus of elasticity (MOE) as a function of cambial age

From: Radial variation in modulus of elasticity, microfibril angle and wood density of veneer logs from plantation-grown Eucalyptus nitens

Wood property and parameters Cambial age F2,22
Strathblane Geeveston Florentine
Mean (SE) Mean (SE) Mean (SE)
Wood density (kg m−3)
  Asymcore1 562.0a (8.4) 523.0b (8.6) 520.0b (7.2) 8.2**
  Asymouter2 668.1ab (23.4) 704.5a (21.3) 619.6b (18.7) 4.6*
  Xmid3 10.5a (0.9) 10.2a (0.7) 9.0a (0.8) 1.1ns
  scal4 0.8a (0.3) 1.3a (0.3) 1.1a (0.3) 0.8ns
  RMSE5 (kg m−3) 24.8 19.8 21.6  
MFA (degrees)
 Asymouter2 7.9ab (0.5) 8.2a (0.6) 6.4b (0.4) 4.3*
  R06 21.5a (1.2) 22.3a (1.1) 22.2a (0.8) 0.1ns
  lrc7 − 1.0a (0.1) − 1.4ab (0.1) − 1.5b (0.1) 5.8**
  RMSE5 (degrees) 1.9 1.6 2.1  
MOE (GPa)
  Asymouter2 18.7a (1.5) 20.0a (1.5) 22.2a (1.7) 1.2ns
  Xmid3 0.8a (0.8) 2.5ab (0.8) 3.8b (0.8) 3.6*
  scal4 3.4a (0.5) 4.4ab (0.5) 5.8b (0.5) 5.9**
  RMSE5 (GPa) 1.1 1.0 1.0  
  1. A four-parameter logistic model was fitted for wood density, an asymptotic exponential model for MFA and a three-parameter logistic model for MOE. Sites with common letters are not significantly different for the parameter indicated
  2. nsP ≥ 0.05; *P < 0.05; **P < 0.01
  3. 1Asymptote for corewood
  4. 2Asymptote for outerwood
  5. 3Age in years at which the inflection point of the curve occurs
  6. 4Slope at the inflection point of the curve
  7. 5RMSE root mean square error
  8. 6Y intercept
  9. 7Natural logarithm of the rate of curvature