By using direct excavation method, the root fractal characteristics of 4 strains of two-years old Vetiveria zizanioides were surveyed. The root number, link diameter, link length and root orientation were measured, and the proportion parameter α and distribution parameter q were obtained. Based on the FracRoot model, the distribution model of vetiveria roots have been established, which can be used to accurately predict the root length, link diameter and root biomass etc.. By comparing the forecasted results and the actual surveyed results, an...