Abstract
This study examined the distribution and variation of mass to projected area ratio of foliage (LMA, g/m2) within hybrid spruce (Picea engelmannii Parry×Picea glauca (Moench) Voss×Picea sitchensis (Bong.) Carr) crowns across three stages of stand development (20, 60, and 140 years). Variability of LMA was assessed at different heights and branch positions. LMA decreased with distance from top of tree (p<0.0001) at rates that varied among stand development stages (p<0.0001). A multi-level mixed effect analysis indicated that distance from the tip of the first-order branch (p=0.0002) had a significant influence on LMA. In general, LMAs decreased towards the base of the tree and increased towards tree apex.
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