5. Conclusion
GE significantly increased the aboveground biomass and root biomass compared to that observed after implementing different grazing methods. Meanwhile, the R/S ratio of GE was higher than that of MG and RG and lower than that of CG. The SOC content of GE was higher than that associated with grazing methods at soil depths of 0–40 cm, while being significantly higher at 0–10 and 20–30 cm; however, the TN content was lower than that observed after implementing the grazing methods, exhibiting a significant decrease when compared to that obtained with CG and RG. GE significantly increased the C/N and C/P ratios at each soil depth and N/P ratio in the topsoil layer. GE significantly increased the ecosystem organic carbon stocks (EOCs) and decreased the ecosystem total nitrogen stocks (ETNs), with the EOCs being 22.29% (MG) and 16.31% (RG) higher and the ETNs being 7.76% (RG) higher than those obtained with CG. There was a significant positive relationship between EOSs and SOC, C/N, C/P, N/P, and aboveground biomass, and a negative relationship with TP; the ETNs were positively correlated with N and P and negatively correlated with C/N, C/P, aboveground biomass, and root biomass. These results indicate that GE can provide significant improvements in plant recovery and ecosystem organic carbon storage, whereas RG is beneficial for promoting both EOCs and ETNs in karst grasslands.