Author(s):

Ahir BR, Manmohan JR, Gunaga RP and Modi JS

Abstract: The present study was conducted to estimate biomass of above and below ground parts of Acacia mangium Willd plantation. For this eight year old plantation stand at instructional farm of forestry in Navsari agricultural university Navsari has a density of around 400 individuals in 0.25 ha area and a top height of 25.85 m, DBH of tree ranged from 4.5 to 31.75 cm and average 18.20 cm was selected and destructive sample was carried out with seven diameter classes, consist of three individuals in each diameter class. Above ground biomass of tree was measured in three component viz., leaves, branch and trunk while below ground biomass in primary roots and secondary roots. The biomass studies of above ground parts recorded the maximum in 30-35 cm DBH resulted 685 Kg dry biomass per tree which was composed of 104.25 Kg of leaves, 124.28 Kg of branch wood and 456.49 Kg of main trunk while highest below ground dry biomass of one cubic meter root skeleton was 125 Kg/tree comprised of 101.83 Kg of primary roots and 23.18 Kg of secondary roots. Total tree biomass as fresh (1092.09 Kg/tree) and dry (810.02 Kg/tree) biomass was recorded. The proportion of above ground and below ground biomass to total biomass on dry weight basis varied from 84.00% to 92.14% and 7.40% to 16.00% respectively.

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