http://hdl.handle.net/1957/7545 Mon, 20 May 2013 04:29:21 GMT 2013-05-20T04:29:21Z http://hdl.handle.net/1957/33267 Pine regeneration in Oregon : habits and control of seed-eating mammals Hooven, Edward F. (Edward Frank) Sat, 01 Jan 1966 00:00:00 GMT http://hdl.handle.net/1957/33267 1966-01-01T00:00:00Z http://hdl.handle.net/1957/8250 Equations for predicting the 5-year height growth of six conifer species in southwest Oregon Ritchie, Martin W.; Hann, David W.; Oregon State University. Forest Research Laboratory Equations for predicting individual-tree height growth per 5-year period are presented for Douglas-fir, white fir, grand fir, ponderosa pine, sugar pine, and incense-cedar growing in the mixed-conifer zone of southwest Oregon. The data used to develop the equations came from 3,648 trees sampled from 391 stands in the study area. Parameters were estimated by means of nonlinear regression. The model for height growth is expressed as a function of site index, total tree height, crown ratio, and percentage of crown closure at total height of the subject tree. Thu, 01 Mar 1990 00:00:00 GMT http://hdl.handle.net/1957/8250 1990-03-01T00:00:00Z http://hdl.handle.net/1957/8249 Controlling sapstain : trial of strong stain-preventive solutions on selected western softwoods in storage prolonged for 12 months Miller, Donald J. (Donald James); Oregon State University. Forest Research Laboratory Environmental restrictions have induced many sawmills to seek alternatives to pentachiorophenol (penta) and similar chlorinated phenols for controlling mold and fungal stains on green lumber during storage and shipment. For that purpose, ten alternative stain preventives were evaluated against a traditional penta product (Permatox 101) on studs of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco], hem-fir [Tsuga heterophylla (Raf.) Sarg.; Abies sp.], and sugar pine [Pinus lambertiana (Dougl.)] in field trials over a 12-month period. Strong solutions of most preventives provided good to excellent protection for 2 months. Efficacy decreased substantially after the studs were stored 6 months through warm weather. Hem-fir, and to a lesser degree, Douglas-fir, were adequately protected for 12 months only by Permatox 101. None of the treatments protected sugar pine for 1 year. Mon, 01 Jan 1990 00:00:00 GMT http://hdl.handle.net/1957/8249 1990-01-01T00:00:00Z http://hdl.handle.net/1957/8248 Equations for predicting the height to crown base of six tree species in the central western Willamette Valley of Oregon Zumrawi, Abdel Azim M. A.; Hann, David W.; Oregon State University. Forest Research Laboratory This paper presents equations developed to predict the height to live crown base of six species in the central western Willamette Valley of Oregon. Weighted nonlinear regression was used to fit a separate logistic equation for each species. The predictor variables are total tree height, crown competition factor in trees with larger diameter at breast height than the subject tree, stand basal area, and diameter-height ratio. The equations will be used in two ways: 1) to estimate crown ratio on trees for which that measurement is missing, and 2) to simulate crown change in a single-tree/distance-independent growth and yield model. Application of these equations will be most reliable in stands that are free from thinning effect. Wed, 01 Mar 1989 00:00:00 GMT http://hdl.handle.net/1957/8248 1989-03-01T00:00:00Z