|
Title
Radial variation in wood static bending of naturally and plantation grown alder stems
Authors
MAJID KIAEI
Received
August 12, 2012
Published
Volume 47 Issue 5-6 May-June
Keywords
Alnus glutinosa, static bending properties, natural forest, plantation forest
Abstract
This study was carried out to determine radial variation of wood density, modulus of elasticity (MOE), modulus of
rupture (MOR) and stress at elastic limit in plantation and natural alder forests in the north of Iran. Testing samples
were taken at breast height of the stem and in three radial positions (10, 50 and 90% of radius) from natural and
plantation forests to determine wood mechanical strength properties, according to the ASTM standard. The analysis of
variance indicated that planting conditions (natural and plantation forests), radial position and their interaction had no
significant effects on the modulus of elasticity (MOE), modulus of rupture (MOR) and stress at elastic limit in alder
wood, while only radial position had a significant effect on wood density. Wood density was increased along radial
direction from the pith to the periphery for both planting conditions. Overall, the mechanical strength properties in the
plantation forest were slightly higher compared to the natural forest. The relationship between wood density and
mechanical properties were analyzed by linear regression. A positive relationship was found between wood density and
mechanical properties for both planting conditions. This relationship was stronger in plantation grown, compared to
naturally grown trees.
Link
|
