1. Disturbance (Forest) - Any discrete force, for instance fire, wind, disease,
insects, or logging, that significantly alters forest composition, structure,
and/or functioning. Natural disturbances include all historical disturbances
that influenced forests prior to European contact, including those resulting
from First Nations' use.
http://www.silvafor.org/ecocert/sffstandardsforbc.pdf
2. Disturbed forest - A forest that has changed or been degraded due to human
impact.
http://ohia.com/ohia/roadshows/sky/glossary.htm