Xylogenesis of <i>Pinus koraiensis</i> is delayed with elevation increase but advanced in smaller rather than larger age.

Altitude had highly significant effects on the duration proportion of latewood wall thickening ( F = 7.77, P = 0.004) and latewood tracheid wall thickness ( F = 18.19, P< 0.001), with walls 0.91 μm thicker at 1150 m than at 750 m.

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