Excerpt from A Checklist of Vascular Plants on the H. J. Andrews Experimental Forest, Western Oregon

The H. J. Andrews Experimental Forest was virtually undisturbed until 1950, when logging and road construction began. Logging in the area has been of two types: (1) salvage logging in which scattered decadent trees are harvested from old-growth stands adjacent to roads; and (2) clearcut logging where all trees are removed from areas ranging from about 4 to 16 hectares in size. Following logging, these clearcut units are generally broadcast-burned to eliminate logging slash. In the ensuing 20 years, 91 clearcut units have been logged, totaling 856 hectares, or approximately 14 percent of the total forest area. Thus, clearcut areas undergoing secondary succession range from 1 to 20 years in age and occupy a number of diverse sites (fig. Road rights - of way are also important in providing routes for plant migration in the forest. Road mileage now totals about 40, and rights - of - way occupy almost 2 percent of the total area.

Specialized habitats existing on the forest include rock outcrops, mountain meadows, small bogs, and riparian zones. Rock outcrop areas, although numerous, are small and scattered throughout the forest over a wide range in elevation. Meadow Openings are generally confined to ridge - top positions at elevations of to meters and often ringed by stands of Abies Zasiocarpa. These rock outcrops and meadows offer a diversity of microhabitats and provide refuge for many plant Species unable to compete elsewhere (hickman Plant collections have been made in several bog areas which are situated over a consider able range in elevation. The most interesting boggy area, taxonomically, has been one at the head of Mack Creek near the summit of Lookout Moun tain. Riparian zones are probably the most extensive of all specialized habitats, as it is estimated that approximately 100 miles of perennial stream channel exist on the forest. Finally, there are extensive areas of aznus sinuata-dominated communities within the abam zone which occupy areas of heavy snow accumulation and impeded drainage.

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