A preliminary classification of tree vigor for western larch and Douglas-fir trees in western Montana /

Tree vigor ranks high as an important factor in the silvicultural management of timber stands.The numerous classification systems in use today for different tree species demonstrate its wide acceptance.It is, therefore, not surprising that large differences in the growth rates of individual reserve trees in the larch-fir type are found to be associated with vigor.Data collected in 19U7 as part of a study of cut-over larch-fir stands in western Montana provide a basis for a practical tree vigor classification for western larch and Douglas-fir trees.