Climate change has intensified extreme weather events, increasing the vulnerability of mountainous regions to shallow landslides, erosion, and seismic-induced ground instability. Root-reinforcement offers a sustainable solution for slope stabilization, yet its dynamic behavior under loading conditions remains underexplored. This study investigates the dynamic response of sand soil reinforced with Abies fabri roots at a 1 Hz frequency, shear strain amplitude (gamma) of 0.05 %-1.0 %, and confining pressures (sigma(y)c) of 25-200 kPa. Samples were prepared with root volume ratios (RVR) of 0.25 %, 0.50 %, and 1.0 % to evaluate the influence of root-reinforcement on dynamic shear modulus (G) and damping ratio (D). The results show that root-reinforcement significantly enhances soil stiffness and resistance to deformation, attributed to soil-root interlocking and cohesion mechanisms. The dynamic shear modulus increased by 32 % at a confining pressure of 25 kPa and 35 % at a confining pressure of 200 kPa (1 % RVR compared to unreinforced soil). Furthermore, the normalized shear modulus consistently increased with RVR and confining pressure. Among damping ratio approaches, the asymmetric hysteresis loop (ASHL) and Modified ASTM approaches exhibited lower variation across cycles, indicating their reliability for root-reinforced soils. The damping ratio of root-reinforced soil decreased by 23 % at 1 % RVR. Additionally, increasing the confining pressure from 25 kPa to 200 kPa resulted in a 22 % reduction in the damping ratio. These findings highlight the potential of root-reinforced soils to reduce shallow landslide risk in seismically active slopes by improving shear stiffness and enhancing resistance to dynamic loading.