. The deterioration of beetle-killed Douglas-fir in western Oregon and Washington. Clackamas River drainage in the northern Ore- gon Cascade Range were nearly as old (240+ years) and large ( inches ) but had only about 15 percent of the original cubic volume 11 years after death. Although statisti- cal proof is lacking, the authors feel that, for a given latitude, deterioration is more rapid in the Cascades than in the Coast Ranges. It seems reasonable that deterioration is more rapid during drier summer conditions in the Cascades. The cool, damp conditions in the Coast Ranges, parti
. The deterioration of beetle-killed Douglas-fir in western Oregon and Washington. Clackamas River drainage in the northern Ore- gon Cascade Range were nearly as old (240+ years) and large ( inches ) but had only about 15 percent of the original cubic volume 11 years after death. Although statisti- cal proof is lacking, the authors feel that, for a given latitude, deterioration is more rapid in the Cascades than in the Coast Ranges. It seems reasonable that deterioration is more rapid during drier summer conditions in the Cascades. The cool, damp conditions in the Coast Ranges, particularly on the western slopes, appear to reduce the rate of decay as compared with interior areas. The effect of tree age on rate of deteriora- tion is suggested by comparison of deteriora- tion in 140-year-old beetle-killed trees at Ma- pleton and 250- to 350-year-old trees at Marys Peak (table 2). After 9 years, 36 percent of the original cubic volump was decayed at Marys Peak, whereas, for the same period, the young- er (and smaller) trees at Mapleton were 66 percent decayed. The two areas are near the. 6 YEARS DEAD 7 YEARS DEAD 9 YEARS DEAD 10 YEARS DEAD 10. 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 Wright, Kenneth H; Harvey, G. M. (George Mather), 1922-. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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