Structure and function of oak forest ecosystem of north - eastern India I. Biomass dynamics and net primary production
AbstractThe paper elucides with biomass dynamics and net primary productivity in two sites of oak forests in north-eastern India. The allometric relationship of age and dbh (diameter breast height) in different important trees with respective biomass (i.e. bole, branch, twig and leaf) were computed and the r2 values were highly significant. The total non-photosynthetic to photosynthetic biomass ratio decreased with the increase of age. The accumulation of biomass in the photosynthetic parts ranged from 1 to 3 times in age series of 12 tree species. Of the total aboveground forest biomass, tree acounted for 98.33%, shrub 1.09% and herb 0.58%. The mean and current annual production of tree species varied from 0.1 to 5.0 t ha-1 and 0.6 to 4.8 t ha"1 respectively. Production fefficiency in terms of net production per unit weight of leaf or per unit area of leaf varied from 0.70 to 1.22 kg net production m2 leaf area per year. The biomass accumulation ratio in tree layer ranged from 7.57 to 8.99. The total net production in both forests ranged from 27.84 t ha-1yr-1 to 28.32 t ha-1 yr-1.
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