Response of competing vegetation also varies among site types. Generally, the more mesic the site, the stronger the understory competition. However, potential competing species are not necessarily present in every stand. Potential for inducing advance reproduction of each canopy species. Regeneration requirements vary greatly with species.
Some conditions are more difficult to meet artificially than others.
Potential for introducing other tree species suited for the site type that are not present in the current stand. Current stand composition is invariably the result of past treatments or disturbances and does not necessarily include seed sources of the best adapted or most desirable species. Reintroduction of such species is often possible by planting or direct seeding. Existing and potential damaging agents. Management practices that are ecologically sound on a site or local ecosystem level may not address landscape and regional concerns.