(A) Current old-growth forests, resulting from the long-term
absence of large-scale disturbances, and which are under
consideration for management for timber production.
(B) Current old-growth forests, which are at risk of losing
important elements of their structure or of being subject to
intensive disturbances that they have not experienced
historically. If, for whatever reasons, natural disturbances
are unable to reduce this risk, active management may be
required to maintain desirable attributes. We term this
‘‘cultural old-growth’’.
(C) Regrowth and secondary forests, which have been managed for
other objectives, usually timber production, and are now
targeted for the re-development of old-growth attributes.