http://hdl.handle.net/1957/7545 Search the Channel search http://ir.library.oregonstate.edu/dspace/simple-search http://hdl.handle.net/1957/8250 Title: Equations for predicting the 5-year height growth of six conifer species in southwest Oregon <br/> <br/>Description: 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. Mon, 26 Feb 1990 22:58:59 GMT http://hdl.handle.net/1957/8249 Title: Controlling sapstain : trial of strong stain-preventive solutions on selected western softwoods in storage prolonged for 12 months <br/> <br/>Description: 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. Fri, 29 Dec 1989 22:58:59 GMT http://hdl.handle.net/1957/8248 Title: Equations for predicting the height to crown base of six tree species in the central western Willamette Valley of Oregon <br/> <br/>Description: 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. Sun, 26 Feb 1989 22:58:59 GMT http://hdl.handle.net/1957/8247 Title: Height-diameter equations for sixteen tree species in the central western Willamette Valley of Oregon <br/> <br/>Description: Equations for predicting tree height as a function of diameter outside bark at breast height are presented for 16 tree species from the central western Willamette Valley of Oregon. Foresters can use these "height-diameter" equations to avoid the time consuming task of measuring heights of all individual trees in an inventory, a stand exam, or a timber cruise. Equation coefficients were estimated with weighted nonlinear regression techniques. Because site index can influence height, alternative equations including transformations of site index as an independent variable also are presented for 6 of these 16 species. Tue, 29 Dec 1987 22:58:59 GMT