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Title

THE EFFECT OF ALTITUDE ON THE PHYSICAL PROPERTIES OF JUVENILE WOOD; HORNBEAM SPECIES (CASE STUDY: MASHELAK FOREST – NOSHAHR)

Writers

KIAEI M.

Pages

 Start Page 41 | End Page 48

Abstract

 This study examines the effect of ALTITUDE on physical properties of HORNBEAM JUVENILE WOOD. For this purpose, nine healthy twelve-years-old trees of HORNBEAM species were selected in three ALTITUDE levels 300, 750 and 1350 meters at Mashelak forestry project. From each tree, three discs for breast height, 50% and 75% height of trees cut down. samples of discs prepared to measure physical properties such as OVEN-DRY DENSITY, BASIC DENSITY, volume shrinkage and volume swelling. The analysis of variance showed that the effect of ALTITUDE on the OVEN-DRY DENSITY, BASIC DENSITY, VOLUMETRIC SHRINKAGE, and VOLUMETRIC SWELLING of HORNBEAM JUVENILE WOOD were significant. Trend of wood BASIC DENSITY and OVEN-DRY DENSITY in longitudinal axis from the bottom to the top of tree is decreasing. The interaction effect between ALTITUDE and longitudinal axis on wood BASIC DENSITY, OVEN-DRY DENSITY, VOLUMETRIC SWELLING, and VOLUMETRIC SHRINKAGE wasn’t significant and while the longitudinal axis effect on OVEN-DRY DENSITY and BASIC DENSITY was significant. The correlation results showed that relationship between density and variation dimension correlation results of wood on 750 meter is stronger than other ALTITUDEs.

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