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Ano > Paul E -; Fiddler, Gary; Filip, Gregory M. 1989. Decay losses associated with wounds in commercially thinned true fir stands in northern California. Res. Pap. PNW-RP-403. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p. A total of 562 white firs {Abies concolor{Go rd. & Glend.) Lindl. ex Hildebr.) and red firs (A. magnificaA. Murr.) with logging wounds were felled, dissected, and analyzed for infection and decay in 28 commercially thinned stands on the Klamath and Tahoe National Forests in California. On the Klamath National Forest, decay losses associated with wounds were 1 .2 and 5.7 percent of the gross merchantable cubic-foot volume and Scribner board-foot volume, respectively; on the Tahoe National Forest, these volumes were 1.7 and 7.6 percent. Wound area and age were most closely related to extent of decay. Volumes are given in cubic and board feet of decay for wounds of various sizes and ages. Keywoods: Heartrot, logging damage, thinning, white fir, red fir. Summary In 1981 , 562 white and red firs with wounds were sampled in 28 commercially thinned stands in the Klamath and Tahoe National Forests in northern California. All stands were naturally established and had been thinned by conventional logging methods 2 to 25 years before the study was conducted. Trees were selected primarily near skid trails because most logging damage was concentrated there. Thirty-six trees had wounds that occurred many years before the sample stands were thinned. Decay losses associated with these wounds were 3.1 and 7.1 percent of the cubicand Scribner board-foot volumes, respectively, of the affected white and red fir trees. In the Klamath National Forest, 258 true firs with 269 thinning wounds were sampled. Volume losses associated with decay were 1.2 and 5.7 percent, respectively, of the gross merchantable cubicand Scribner board-foot volumes. In the Tahoe National Forest, 268 true firs with 271 thinning wounds were sampled. Decay associated with wounds on both Forests ranged from 0 to 19.4 and 0.1 to 47.0 percent, respectively, of the gross merchantable cubicand Scribner board-foot volumes. Neither wound aspect nor condition (open or closed) significantly influenced incidence of infection or amount of associated decay in true firs in either Forest. Wound height, however, had a significant effect on extent of decay in both Forests. The most important wound characteristics related to associated decay were age and original and present size. Present wound size and age were used in regression analysis to develop equations that can be used to estimate cubicand Scribner board-foot decay losses associated with thinning wounds on true firs in the Klamath and Tahoe National Forests.

Decay losses associated with wounds in commercially thinned true fir stands in northern California /