Secondary xylem maturation evaluated by modeling radial variations in anatomical characteristics and wood properties of Shorea macrophylla (De Vr.) Ashton planted in Sarawak, Malaysia

Xylem maturation depends on cambial age rather than diameter growth in Shorea macrophylla by the model selections for radial variations cell length, wood fiber traits, and basic density. Radial anatomical characteristics properties were investigated 23-year-old (engkabang) trees planted Sarawak, Malaysia. The effects of rates manner xylem determined based selected mixed-effects models. best models variation fitted linear functions wall thickness, density, compressive strength. Logarithmic applied vessel element length frequency, quadratic diameter. Vessel affected although these other minimal. In fixed part models, results showed small mean absolute error values relation to distance from pith according frequency contrast, estimated age, smaller obtained suggesting that all varied bark except traits. Thus, S. macrophylla, density due growth, but traits depended growth.