Author: Randall O'ToolePublisher:
ISBN:
Category : Forest regeneration
Languages : en
Pages : 26
Book Description
High Elevation Regeneration of Western Oregon Forests
Author: Randall O'ToolePublisher:
ISBN:
Category : Forest regeneration
Languages : en
Pages : 26
Book Description
The Dead Indian Plateau
Author: Don MinorePublisher:
ISBN:
Category : Forest regeneration
Languages : en
Pages : 30
Book Description
The Dead Indian Plateau is a gently sloping area of 100,000 acres (40,000 ha) east of Ashland, Oregon. It is a valuable source of timber, but timber stands on the plateau often are difficult to regenerate after logging. Many people have been observing and studying these regeneration problems and other aspects of the Dead Indian Plateau for many years. This report is a summary of their observations, measurements, and conclusions.
USDA Forest Service Research Paper PNW.
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 544
Book Description
Influence of Light on the Growth of Advance Regeneration in the Understory of Douglas-fir Dominated Forests in Western Oregon
Author: Florian DeisenhoferPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 270
Book Description
The growth potential of Douglas-fir, grand fir and western hemlock advance regeneration in the forest understory of Douglas-fir-dominated forests was investigated to detennine the feasibility of selection cutting systems in northwest Oregon. This study compared the growth of Douglas-fir, grand fir and western hemlock advance regeneration along a light gradient with hemispherical photography, modeled the relative importance of light, competition, subject tree and stand characteristics on growth and reported observations on the growth response of advance regeneration to stand manipulation. Western hemlock, grand fir and Douglas-fir advance regeneration was found at 5, 6, and 7 % of diffuse skylight in selection thinned stands respectively, indicating that all three species are capable of survival and growth in low light and, therefore, are suitable for uneven-aged management. Growth of advance regeneration in terms of height, diameter and volume followed the order: Western hemlock> Douglas-fir> grand fir, although there was seldom a significant difference between Douglas-fir and grand fir. Overtopping shrub vegetation significantly reduced growth and light availability in comparison to trees that were not overtopped. Height, radial and volume growth of all three species increased with increasing light. Regression analysis revealed that along the measured light gradient (6 44 % of diffuse skylight) i; growth of western hemlock was superior (different intercepts) to Douglas-fir at one interior Coast Range site but there was no significant difference in the relationship of growth to increased light levels (equal slopes) ii; Douglas-fir advance regeneration growth was superior (different intercepts) to grand fir at three sites but there was no significant difference in the relationship of growth to increased light levels (equal slopes). Growth modeling explained 36 to 67 % of the variation in Douglas-fir, western hemlock and grand fir advance regeneration growth and revealed that tree characteristics were better predictors of advance regeneration growth than environmental variables. Independent of species, live crown ratio was the most important variable explaining variation in absolute height growth. The best-growing trees were in general taller than competing shrub vegetation and characterized by higher live crown ratios. Western hemlock was particularly sensitive to shrub cover and grew best when shnib cover was low (
Regenerating Oregon's Forests
Author: Brian D. ClearyPublisher:
ISBN:
Category : Forest management
Languages : en
Pages : 308
Book Description
Natural Regeneration Study in Western Oregon
Author: Harold S. DixonPublisher:
ISBN:
Category : Forest regeneration
Languages : en
Pages : 54
Book Description
USDA Forest Service General Technical Report PNW.
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 224
Book Description
Structural Development of Late Successional Forests in the Central Oregon Coast Range
Author: Barbara A. SchraderPublisher:
ISBN:
Category : Western hemlock
Languages : en
Pages : 350
Book Description
Patterns of western hemlock regeneration were studied in relation to forest structural development and environment in the Oregon Coast Range. Density of western hemlock seedlings was examined across the climatic gradient from cool, moist coastal areas to the seasonally hot and dry Willamette Valley Margin. Seedling densities were most strongly related to stand-level variables including stand age, frequency and abundance of overstory western hemlock trees, abundance of coarse woody debris, decreasing shrub cover, and increasing overstory conifer cover. Significant regional climate and topographic variables included mean annual temperature, precipitation and elevation. Dispersal distances between western hemlock seedlings and potential parents were characterized by measuring distances between seedlings and potential parents. Cone production in western hemlock trees by size class was estimated in four late successional Coast Range stands. Dispersal distances were most commonly short - generally within 10 meters of the nearest potential parent tree. Cone production was related to diameter and crown position, with larger codominant and dominant trees producing more cones than smaller trees. Dynamics and age structure of western hemlock in late successional forests was described in terms of age and size distributions, rooting patterns, and growth rates of western hemlock seedlings, saplings, and trees across the climatic gradient and related to stand level factors in six late successional forests. Time between initial and subsequent western hemlock regeneration pulses varied between 40-70 years. These patterns were observed in all stands. Striking differences in substrate colonization patterns were observed between seedlings and trees and at climatic extremes. Seedlings were predominantly observed on decaying wood while trees were generally observed on forest floor substrates. An exception to this pattern occurred in near-coastal sites where western hemlock of all size classes were found almost entirely on decaying wood substrates. Growth rates across size classes were also calculated and related to regional and stand-level variables. Highest growth rates occurred in low elevation coastal sites, in stands containing the highest levels of coarse woody debris, and the highest level of canopy gaps. Seedling growth rates averaged 4 cm/year for seedlings, and between .2-.6 cm/year diameter growth for overstory saplings and trees.
Tree Planters' Notes
Author: Publisher:
ISBN:
Category : Tree planting
Languages : en
Pages : 472
Book Description
Some no. include reports compiled from information furnished by State Foresters (and others).
Author: