EVALUATION OF PINUS ROXBURGHII SARGENT POPULATIONS FOR WOOD CHARACTERISTICS
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Date
2016
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UHF,NAUNI
Abstract
ABSTRACT
The study “Evaluation of Pinus roxburghii Sargent populations for wood characteristics”, was carried out in the Department of Forest Products, College of Forestry, Nauni, Solan (HP) during 2014-15. The results revealed that maximum moisture content (18.32 %) and longest tracheid length (6.34 mm), cold water soluble extractives the highest value of 7.52 per cent was recorded in Ghanahatti population. The highest specific gravity of 0.6127 was recorded in control (Teak).. Maximum hot water soluble extractive of wood 9.47 per cent was recorded in Nihari. Maximum alcohol-benzene solubility of 14.15 per cent was also found in Ghanahatti. Whereas, maximum Klason-lignin content of 33.58 per cent, noticed in Nihari and maximum holocellulose 70.44 per cent was found in Sarahan population. The maximum tensile and bending strength was recorded in Chabbal (0.043 kN/mm2) and in Banethi (0.0089 kN/mm2) resepectively. In Teak, compressive strength of 0.057 kN/mm2 was observed, which was higher than Pinus roxburghii. Highest compressive strength perpendicular to grain was observed at site Nurpur (0.0180 kN/mm2). Out of 78 combinations of simple correlation coefficient, 18 combinations were found to be positives and significant, and 14 combinations were negative and significant. Specific gravity of wood revealed highly significant and negative correlation with moisture content (-0.930) and trachied length (-0.657). Lignin percentage of wood reflected highly significant and negative correlation with holocellulose percentage of wood (-0.796). Also, Cold water extractives had highly significant and positive correlation with hot water extractives (0.753), alcohol-benzene extractives (0.671) and tensile strength (0.907). Coefficient of variation was observed to be 98 per cent for tensile strength. R2 value for specific gravity when regressed with chemical parameters showed 98 per cent of variability. Very high heritability was recorded in tensile strength (80.31%) and moderate in alcohol-benzene extractives (78.00%), hot water soluble extractives (75.93%), holocellulose (74.71%) and tracheid length (66.84%). The phenotypic coefficient of variability was found to be slightly higher than genotypic coefficient of variability in all parameters. Low genetic advance and high genetic gain was recorded in tensile strength of wood.
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