Fajardo et al. examined the role of competition and facilitation on the degree of conspecific genetic relatedness of nearby individuals of tree populations of Nothofagus pumilio following large-scale fires in Patagonia (Chile). They found that trees located in the interior of second-growth forests had significantly lower relatedness suggesting a fading of the recolonization structure by competition, whereas trees located in the edge of the same second-growth forests showed a positive and highly significant relatedness among trees, resulting from facilitation.
Fajardo, A., Torres-Díaz, C., & Till-Bottraud, I. (2015). Disturbance and density-dependent processes (competition and facilitation) influence the fine-scale genetic structure of a tree species’ population. Annals of Botany, 117(1), 67–77. https://doi.org/10.1093/aob/mcv148