Tree diversity, population structure, biomass accumulation, and carbon stock dynamics in tropical dry deciduous forests of Eastern India.

Background: Tropical dry deciduous forests are crucial for biodiversity conservation and carbon storage but are increasingly threatened by human activities and climate change. This Study evaluates tree diversity, population structure, and biomass carbon stock across five forest ranges of eastern India.

Methodology: A stratified random sampling approach was implemented using a 5 km × 5 km grid for vegetational attribute studies. Tree diversity was assessed within 0.1 ha (31.62 m × 31.62 m) plots, while biomass estimation focused on trees with ≥ 10 cm. girth at breast height. Population structure and biomass estimation were analyzed across six defined girth classes, employing standardized protocols to ensure accurate carbon stock estimation.

Results: A total of 80 tree species belonging to 68 genera and 33 families were recorded, with Fabaceae emerging as the dominant family. Significant variation in species richness (32-52 species), tree density (804-1332 trees/ha), and basal area (18.28-24.92 m²/ha) was observed across the five forest ranges. Kolabira forest range (3.45) and Bagdihi forest range (3.37) exhibited the highest diversity indices, highlighting their ecological significance and carbon sequestration potential. Mid-sized trees (32-101 cm) contributed the most to biomass accumulation, while the lower densities in other size classes suggest selective exploitation. Total biomass was highest in Belpahar forest range (129.63 Mg/ha) and lowest in Jharsuguda forest range (86.73 Mg/ha), with a corresponding biomass carbon stock of 58.47 MgC/ha and 40.76 MgC/ha, respectively, emphasizing spatial variations in carbon storage across these dry deciduous forests.

Conclusion: The findings highlight the ecological significance of tropical dry deciduous forests and underscore the urgent need for conservation strategies to safeguard biodiversity and enhance carbon storage. In parallel, the study offers a valuable scientific foundation for advancing forest management practices and shaping policies to address biodiversity loss and climate challenges in this vital region of India.