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FOR93: Chapter 4: Plant Succession and Disturbances in the Urban Forest Ecosystem

Figure 11.4. The eruption of Mt. Saint Helens is an example of primary succession. It eliminated most traces of life in a substantial area of the northeastern part of the mountain (11.1). Less than a decade later, pioneer and early successional plants have colonized the area (11.2). Eventually, Douglas-fir forests will become established (11.3) and, without further disturbance, over several hundred years a Western hemlock forest may eventually occupy the area (11.4).

Credit: National Park Service