Melinis minutiflora invasion threatens the biodiversity of a campo rupestre biome.
The site was assessed using leaf C, N, and δ15N, and soil C, N, NO3− and NH4+.
Soil had a high level of NH4+ and a high N-based fertility from N2 fixation.
NO3− increased in invaded soils through the stimulation of nitrifying bacteria.
N fertilisation in restoration procedures may increase the invasiveness degree.