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082			_a634.9 _bSHA/EV
100			_aShanavas A
245			_aEvaluation of fuelwood characteristics, physical and mechanical properties of selected agroforestry tree species
260			_aVellanikkara _bDepartment of Silviculture and Agroforestry, College of forestry _c2001
502			_bMSc
520	3		_aAn experiment to evaluate the fuelwood value, and physical and mechanical properties of selected agroforestry tree species was conducted at the College of Forestry, Vellanikkara. The study involved determination of the fuelwood value of 48 species/materials and assessment of the physical and mechanical properties of three promising multipurpose trees having local importance, viz., Acacia auriculiformis, Acacia mangium and Grevillea robusta. Variations abound in the calorific values of agroforestry species and their tissue-types. Ash content, specific gravity, chemical composition and moisture content of tissues are primary factors affecting calorific value; while species and tissue-types, may exert a secondary control. Ash content and moisture content had a negative correlation with calorific value, whereas specific gravity exerted a positive influence. Based on the range in calorific values and fuelwood value indices obtained, different species and tissue-types could be broadly divided into three categories: high, medium and low. Calorific value of different tissue fractions decreased in the order: heartwood> sapwood > bark. Mean ash percentage of tissue-types followed the order: bark> sapwood > heartwood. Variations of ash content along bole height followed the order: branchwood > top > bottom > middle. Mean specific gravity of tissue-types followed the order: heartwood> sapwood > bark. For sample positions it followed the sequence: bottom> middle> top> branchwood. Wood moisture content increased from bottom to top along tree height and for tissue-types, it followed the order: bark < heartwood < sapwood. Coconut shell recorded the highest fuel value index (FVI) which was approximately 25 times greater than the highest value for tree species (Casuarina equisetifolia). Physical and mechanical properties of Acacia auriculiformis was significantly supenor to that of Acacia mangium and Grevillea robusta. The physical and mechanical properties were affected by both species and sample positions. Wood specific gravity increased from inner to outer sample positions along radial direction except for Grevillea robusta, which followed the order: outer < inner < middle. Moisture content decreased from inner to outer sample positions in Acacia mangium; while Grevillea robusta exhibited a divergent trend. Variations in shrinkage along radial direction followed the same trend as that of moisture content but was inconsistent with that of specific gravity. Most of the strength properties followed a trend similar to that of specific gravity. On a final note, specific gravity, work to limit of proportionality in static bending, work to maximum load in static bending, compressive stress at limit of proportionality in parallel to grain, compressive stress at limit of proportionality in perpendicular to grain and end-hardness of Acacia auriculiformis were greater than the values reported for teak. The physical and mechanical properties of Acacia mangium and Grevillea robusta except for shrinkage were less than that of teak.
700			_aDr.B.Mohankumar (Guide)
856			_uhttp://krishikosh.egranth.ac.in/handle/1/5810105759
942			_2ddc _cTH