SHARMA, K.R.RATHER, SHABIR AHMAD2017-01-102017-01-10201247845http://krishikosh.egranth.ac.in/handle/1/95274ABSTRACT The present investigation entitled “Evaluation of High Density Plantation of Eucalyptus tereticornis Smith for Wood Characteristics” was carried out on the high density plantatation of Eucalyptus tereticornis rasied at Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan (HP) India in the year 1986. Twelve trees, aged about 25 years were selected and felled in the year 2011. Five centimeter wide wood discs were removed from the main stem at 0 (H1), 30 (H2), 60 per cent (H3) and 10 cm at 90 per cent (H4) of total tree height. These were analysed for variation of diameter over bark (d.o.b.), diameter under bark (d.u.b.), wood per cent, bark per cent, wood bark ratio, moisture content of wood with bark, specific gravity, fibre length, cold water soluble extractives, hot water extractives, alcohol-benzene soluble extractives, Klason lignin and holocellulose contents. Spacing S3 (120 × 120 cm) recorded the maximum height of 14.985 m and spacing S1 (60 × 60 cm) the minimum (11.474 m) showing significant difference. Green biomass of main bole, branches, twigs and leaves, total aboveground green biomass and mean exact stem volume per tree varied significantly among spacings. However, mean stem volume per tree on dbh basis and form factor showed non-significant variation among different spacings. The highest d.o.b. (16.878 cm) and d.u.b. (14.241 cm) were found for spacing S3 and lowest (10.913 cm and 8.912 cm, respectively) for S2 (90 × 90 cm). These decreased with increase in sampling heights. The maximum wood per cent of 85.332 per cent was recorded for S3 and minimum (82.526 per cent) for S1 showing significant difference. The highest wood per cent of 86.129 per cent was observed at H3 and lowest (77.081 per cent) at H1, showing an increasing trend with increase in sampling height. The opposite trend was shown by bark per cent which increased with increase in sampling height. The maximum wood bark ratio of 6.263 was recorded for S1 and minimum (5.039) for S2. Among sampling heights, highest wood bark ratio of 6.461 was recorded at 60 per cent of total tree height and lowest (3.456) at ground level. The maximum moisture content of wood with bark of 81.067 per cent was found for S1 and minimum (66.155 per cent) for S3. Sampling height H1 showed highest moisture content of 81.238 per cent and lowest (69.233 per cent) was recorded at H4, displaying a decreasing trend with increase in sampling height. Specific gravity increased with increase in spacing. Among sampling heights, the maximum specific gravity was at ground level (0.817) and minimum (0.724) for H4. Fibre length displayed decreasing trend with increase in sampling height and showed a maximum value of 0.893 mm at ground level. The maximum extractives were recorded at ground level and minimum at 90 per cent of total tree height. Klason lignin content decreased with increase in sampling height and observed a highest value of 31.151 per cent at H4. Holocellulose content observed a maximum value of 70.874 per cent at H1 and then decreased with increase in height. Effect of spacing on chemical components of wood was found to be non-significant except alcohol-benzene soluble extractives.enThesis