Fig. 3
From: Variable retention harvesting in the Douglas-fir region
The eruption of Mount St. Helens on May 18, 1980, left behind significant legacies of living and dead organic matter (including snags and logs), which were important elements in the development of the post-eruption ecosystems; this environment provided the stimulus for recognition of the concept of biological legacies of disturbances and a natural model for variable retention harvesting. Note that these legacies have both biological and physical influences on the post-disturbance ecosystem