DEVELOPMENT OF ALLOMETRIC EQUATIONS FOR ESTIMATION OF BIOMASS AND CARBON STOCK IN ACACIA MANGIUM BASED AGROFORESTRY SYSTEM IN ODISHA, INDIA

Abstract The experiment was conducted at the Odisha University of Agriculture and Technology's All India Co-ordinated Research Project on Agroforestry experimental site in Bhubaneswar, Odisha consisting of eight different land use systems viz., Acacia mangium + Pineapple, Acacia mangium + Aloe vera, Acacia mangium + Mango ginger, Acacia mangium + Kalmegh, Acacia mangium + Hybrid napier, Acacia mangium + Thin napier, Acacia mangium + Guinea grass and sole Acacia mangium plantation in randomized block design with three replications. Acacia mangium with kalmegh system at 138 months after planning recorded highest In comparison to other land use systems, Acacia mangium with the Kalmegh system saw the highest growth parameters 138 months after planning, including DBH (26.79 cm), basal area (0.06 m2), height (20.55 m), crown spread (5.58 m), crown depth (9.89 m), and volume (0.26 m3). In comparison to other land use systems, the Acacia mangium + Thin napier Silvipastural system produced the most biomass overall (21261.60 t/ha), carbon stock (197.02 t/ha), and CO2 assimilation (723.06 t/ha). However, the solitary Acacia mangium plantation had the lowest carbon stock (80.04 t/ha), CO2 assimilation (293.75 t/ha), and total biomass output (141.68 t/ha). The carbon content and biomass of the various portions of the Acacia mangium tree were estimated using allometric equations that showed a strong link with the tree's changing breast height diameter in relation to site and species. According to the results, combining thin Napier with Acacia mangium in an agroforestry silvipastural system has a higher capacity to store atmospheric carbon and seems like a workable way to lessen the consequences of climate change.