EFFECTS OF VARIOUS HARVESTING METHODS ON FOREST REGENERATION

摘要: Available literature indicates that for most forest types and species on sites, foresters have wide latitude in choosing regeneration cutting methods insofar as ecological requirements of tree are concerned. Few or sites require uneven-age management under a selection system, necessary conditions can be provided usually by some form even-age management. Likewise, there is no necessity large patch continuous clearcuttings to regenerate types, species, including Douglas-fir; shelterwood strip clearcut systems appear equally suitable sites. Selection used successfully major certain southern pines. They also could many others, change composition acceptable. Ecological constraints do limit use clearcuts more severe is, those where moisture temperature problems. With these exceptions, economic social rather than ecologic considerations the important factors controlling systems.