Natural establishment of conifers at Mount St. Helens

This study tracks the establishment, survivorship, and growth rate of colonizing conifers on substrates deposited during the 1980 eruption of Mount St. Helens. Two 50 x 50 meter plots were installed at sites on the pyroclastic flow north of the crater and the upper portion of the Muddy River mudflow during 1989 and 1990. Two 50 x 50 meter plots were installed on the debris avalanche in 1993 and 1994. In each plot all individual trees are identified to species, measured (total height and stem diameter at ground level), and tagged.

 

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