Expanding on the biodiversity forest therm, the idea is to regenerate a sustainable natural forest that is resistant to pest and disease. Nature sorted this out long ago by replacement and longevity. A good example as in conifers for the US Southeast. The predominant conifer planted here is the loblolly pine, a fast growing pine but is susceptible to fire, pest, disease and has a shorter life span than other conifers. Great for return profits short term but it will get replaced through natural selection by nature if nature takes her course. Here in the southeast hardwood and longleaf pine was the king 150 years ago because of longevity and pest and disease resistance. Natural Selection plays a role in a natural forest no matter where on earth the forest exist.