http://hdl.handle.net/1957/7548 Wed, 19 Jun 2013 01:23:32 GMT 2013-06-19T01:23:32Z http://hdl.handle.net/1957/36132 Wood Pole Maintenance Manual: 2012 Edition Morrell, Jeffrey J. Morrell, Jeffrey J. 2012. Wood Pole Maintenance Manual: 2012 Edition. Research Contribution 51, Forest Research Laboratory, Oregon State University, Corvallis. The specification, inspection, and remedial treatment of utility poles are addressed. Included are discussions of enhancing specifications for improved performance, techniques for detecting decay and other defects, and chemical treatments available for arresting decay of poles in service. Sat, 01 Dec 2012 00:00:00 GMT http://hdl.handle.net/1957/36132 2012-12-01T00:00:00Z http://hdl.handle.net/1957/12584 Including wood stiffness in tree improvement of coastal Douglas-fir in the US Pacific Northwest: a literature review and synthesis Jayawickrama, K. J. S.; Ye, T. Z.; Gupta, R.; Cherry, M. L. Sat, 01 Aug 2009 00:00:00 GMT http://hdl.handle.net/1957/12584 2009-08-01T00:00:00Z http://hdl.handle.net/1957/7886 Reanalysis of the SMC-ORGANON equations for diameter-growth rate, height-growth rate, and mortality rate of Douglas-fir Hann, David W.; Marshall, David D.; Hanus, Mark L.; Oregon State University. Forest Research Laboratory Using existing data from untreated research plots, we developed equations for predicting 5-yr diameter-growth rate (ΔD₅), 5-yr height-growth rate (ΔH₅), and 5-yr mortality rate (PM₅) for Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] in the coastal region of the Pacific Northwest. These equations are revisions of the equations constructed in 1995–1997 for the Stand Management Cooperative's (SMC) version of the ORGANON growth-and-yield model, and they have been developed with substantially larger and more comprehensive data sets than were available in 1995–1997. The new ΔD₅ and ΔH₅ equations were validated with an independent data set. The PM₅ equation was evaluated by comparing 100-yr predictions of Reineke's (1933) stand density index to behavior previously reported from measurements taken on long-term research plots. The new ΔD₅, ΔH₅, and PM₅ equations appear to be considerably superior in predictive ability and behavior to the original equations. The effects of the new equations on stand-level predictions were evaluated by comparing the maximum mean annual increments (MAI) in total stem volume (ft³) and associated rotation ages (RA) predicted from the original SMC-ORGANON model to predictions from the revised SMC-ORGANON model. This analysis was done by making 100-yr projections using 170 plots in young stands from the SMC data sets. Some of the ending values for average crown ratio (CR) after 100 yr of projection were near 15%, however, and predictions of basal area (BA) for some of these stands peaked and then declined over stand age. Substituting the HCB equation published by Hann and Hanus in 2004 for predicting crown recession (ΔHCB₅) eliminated the problem with BA peaking over stand age and resulted in somewhat larger average ending CRs. The 100-yr projections were then made again with the 2004 HCB equation of Hann and Hanus. On average, the revised model reduced RA by 2.1 yr (or 4.3%) and maximum MAI by 55.7 ft³/ac/yr (18.9%). Sun, 01 Jan 2006 00:00:00 GMT http://hdl.handle.net/1957/7886 2006-01-01T00:00:00Z http://hdl.handle.net/1957/7885 Tractor thinning productivity and costs : experience from the Willamette Young Stand Project Kellogg, L. D. (Loren D.); Davis, Chad T. (Chad Thomas); Oregon State University. Forest Research Laboratory Harvesting productivity rates and costs were determined for three silvicultural treatments used in commercial ground-based thinning of young stands to achieve timber management objectives and enhance wildlife habitat. Treatment definitions were based on residual trees per acre (tpa) after thinning. The treatments were light thin (115 residual tpa), light thin with 0.5-ac openings (92 residual tpa), and heavy thin (53 residual tpa). The three study sites were 44- to 46- yr-old stands of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] located in the Cascade Mountains of west central Oregon. Detailed time studies were conducted on timber fallers and crawler tractors and used to develop multiple linear regression models to predict delay-free felling and skidding cycle times for each site. The independent variables common to the regression models to determine delay-free felling cycle time at all sites were diameter at breast height, number of cuts, and number of limbs cut. Only skidding distance was common to all regression models for determining delay-free skidding cycle time. Total costs for each treatment were obtained by combining felling, skidding, and moving costs for the entire operation. Felling costs ranged from $7.20/CCF to $17.73/CCF. Skidding and loading costs ranged from $15.42/CCF to $38.69/ CCF. The cost and productivity results from this study emphasize the importance for forest managers to consider factors such as volume removed and skidding distance when prescribing alternative silvicultural treatments for young Douglas-fir stands. Sun, 01 Jan 2006 00:00:00 GMT http://hdl.handle.net/1957/7885 2006-01-01T00:00:00Z