Planting Spacing and Variation in Mechanical Properties of Poplar Wood (Populus deltoids)

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Abstract

Initial planting spacing affects stem diameter, tree height, and ultimately wood quality due to root and crown competition to reach light, water and nutrients. In the present study, we have investigated the effect of planting spacing and the longitudinal position along the stem height on wood density and mechanical properties of Populus deltoids. The study area has been located in the province of Mazandaran, in the north of Iran. 9 poplar trees (Populus deltoids Barter.ex Marsh) have been randomly selected in 3 PS of the Sari (Mazandaran) Wood and Paper Factory plantation 2×2, 2×3 and 3×3 m. 3 disc samples have been taken at 3 positions along longitudinal direction from bottom to upward (breast height, 50, and 75 % stem height) to measure wood density and investigate its mechanical properties according to ISO and ASTM standard. Testing samples have been prepared from mature wood. The results of the research have shown that the planting spacing significantly influences wood density and mechanical properties. The effect of longitudinal position on the modulus of elasticity has been significant with no changes in the wood density, modulus of rupture, compression parallel to grain and nail withdrawal resistance values. The most optimal initial spacing in view of wood density and mechanical properties has been found at the planting spacing 2×2 m. Analysis of wood quality characteristics indicates that closer PS is more suitable for poplar plantation.

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