Environmental History of a Garry Oak/Douglas-Fir Woodland on Waldron Island, Washington
作者： Peter W. Dunwiddie , Jonathan D. Bakker , Mitchell Almaguer-Bay , Carson B. Sprenger
DOI: 10.3955/046.085.0205
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摘要: Abstract Understanding a system's historical conditions is key first step in mapping out restoration goals and strategies. We examined the age structure stem density of stand dominated by Garry oak (Quercus garryana) Douglas-fir (Pseudotsuga menziesii), related this to its environmental history. Our reconstruction was based on 139 increment cores 197 cross-sections collected from trees 21 plots. Individuals both species were more than 200 years old, indicating that had mixed composition for centuries. The tree ca. one-tenth present prior (oak release) activities. This open oak/Douglas-fir savanna maintained centuries fires set Native Americans. It began infill with oak, later Douglas-fir, 1800s, particularly following Euro-American settlement 1860s. encroachment continued throughout 1900s, very large cohort becoming established early 1970s. r...
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