2026 Vol-6 Issue-2 | PHYTOSOCIOLOGICAL, SOILPHYSICOCHEMICAL, AND CARBON STOCK ASSESSMENT NYIBANGO GRAZING RESERVES JADA LGA, ADAMAWA STATE, NIGERIA

This study assessed the phytosociological characteristics, soil physicochemical properties, and carbon stock of Nyibango Grazing Reserve. A systematic line transect design was adopted using two parallel transects of 1500 m each, spaced 500 m apart. Four sample plots (50 m × 50 m) were established alternately at 100 m intervals along each transect, giving eight plots in total. All living trees with DBH ≥10 cm were identified and measured for diameter and height variables using diameter tapes and a Spiegel relaskop. Soil samples were collected at depths of 0–15, 16–30, 31–45, and 46–60 cm from three sampling points. Data were analyzed using oneway ANOVA and Student's t-test. Results identified 11 tree species belonging to 6 families, with a total density of 61 stems ha⁻¹. Total basal area and volume were 1.62 m² ha⁻¹ and 14.76 m³ ha⁻¹, respectively. Phyllanthaceae recorded the highest frequency, while Juglandaceae had the lowest. Total biomass, carbon stock, and CO₂ sequestration were 8.51 t ha⁻¹, 4.26 t ha⁻¹, and 15.62 kg, respectively. Soils were predominantly sandy loam to sandy clay, with high sand content (64.93%), moderate nutrient levels, slightly acidic pH, and low water-holding capacity. The study highlights the importance of regular carbon monitoring for sustainable grazing reserve management.