. Old growth in northwestern California national forests [microform]. Old growth forests California, Northern; Forest reserves California, Northern; National parks and reserves California, Northern. Figure 8—Coarse woody debris on the forest floor of Douglas-fir/tanoak old Figure 9—Fallen tree in an interior ponderosa pine stand. Although snags and logs are characteristic of old growth, they are not unique to old growth. In the current inventory, we found that stands that did not have the requisite density of large-sized trees to be classified as old growth had, on average, nearly as
. Old growth in northwestern California national forests [microform]. Old growth forests California, Northern; Forest reserves California, Northern; National parks and reserves California, Northern. Figure 8—Coarse woody debris on the forest floor of Douglas-fir/tanoak old Figure 9—Fallen tree in an interior ponderosa pine stand. Although snags and logs are characteristic of old growth, they are not unique to old growth. In the current inventory, we found that stands that did not have the requisite density of large-sized trees to be classified as old growth had, on average, nearly as many snags and logs (at least 20 inches in diameter) per acre as did old-growth stands (see table 2). This would suggest that snags and logs, as a legacy of past disturbances, may be in place before a stand has enough large, old trees to be classified as old growth. Potential Old-Growth We estimate that 5 percent of the forest land in northwestern California National Area Forests that is not old growth today has the potential to be old growth, as classified by the density of large-sized trees, in 30 years. This estimate assumes that no harvesting or severe natural disturbance occurs in these forests over the next three decades and that trees at least 28 inches in diameter are able to grow 2 inches in diameter in 30 years. If we also assume that the acres of potential old growth will retain the density of snags and logs they have today and remain pristine, 121,668 acres could have the full characteristics of old growth in 30 years. Pristine old growth would then increase from 8 percent to 10 percent of the total forest land in northwestern California National Forests. 12. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Beardsley, Debby; Warbington, Ralph; Pacific Northwest Research Station (Portland, Or.
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