The landground management is more important to restaure the nature in all areas. For choice trees there are genetic and adaptative expression. Which is will be choice to our field with minimum risk of richness perturbation.
It depends on the types of plant species of the area. However, adaptive trees are found to be more resilient to the local environments hence preferred to genetic one. In the drylands - the area I know best we often suggest the use of adaptive plants and then few genetic one (exotic in most cases). Cheers