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Book Natural Regeneration of Douglas fir in Uneven aged Stands in Southwest Oregon

Download or read book Natural Regeneration of Douglas fir in Uneven aged Stands in Southwest Oregon written by Jared M. Gerstein and published by . This book was released on 1999 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The response to various levels of stand density by natural Douglas-fir regeneration, shrub and sprouting hardwood species was studied in the mixed-evergreen-forests of southwest Oregon. Partial-cut old growth (harvested 22-31 years prior) and thinned evenaged (harvested 9-17 years prior) stand types were used as surrogates for intentionally managed uneven-aged stand types, which were not available for this study. A lower number of clearcut and uncut stands were also sampled in order to capture the full range of overstory densities. Harvest preceded the establishment of:>95% of seedlings (trees 15-140 cm height) in thinned (970 seedlings/ha) and partial-cut (1300 seedlings/ha) stand types and, 82% of saplings (trees 1.4-5.0 m height, w/ conical crown shape) in partial-cut (370 saplings/ha) stands. These results indicate that harvest stimulated natural regeneration of Douglas-fir. However, regeneration was not evenly spaced throughout the plots. For example, seedling frequency averaged 0.45 in thinned and 0.46 in partial-cut stands (0-1.0 scale). Frequency and density of regeneration tended to increase as stand density index (SDI) decreased. Height growth of regeneration generally increased as SDI decreased. Sapling height growth in partial-cuts was greatest on steep, south facing slopes compared to other slope and aspect combinations. The fastest growing third of individual seedlings had an average annual leader growth of 10 cm/yr. and saplings 38 cm/yr. Shrub cover averaged 61% and increased with time since harvest and on north facing slopes (adj. r2 = 0.33, p

Book Economic Guides for Douglas fir Reforestation in Southwestern Oregon

Download or read book Economic Guides for Douglas fir Reforestation in Southwestern Oregon written by Dennis E. Teeguarden and published by . This book was released on 1969 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Establishment Histories and Structural Development of Mature and Early Old growth Douglas fir Forests of Western Washington and Oregon

Download or read book Establishment Histories and Structural Development of Mature and Early Old growth Douglas fir Forests of Western Washington and Oregon written by James A. Freund and published by . This book was released on 2013 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Regeneration of tree populations following stand-replacing wildfires is an important process in the multi-century development of Douglas-fir- western hemlock forests. Temporal patterns of tree establishment in naturally regenerated, mid-aged (100 to 350 years) Douglas-fir-dominated forests have received little study in comparison with the abundance of research on regeneration in older Douglas-fir stands (>400 years of age). Increment cores were obtained from 1455 trees in 18 mature and early old-growth forests in western Washington and northwestern Oregon USA in order to determine temporal patterns of natural Douglas-fir regeneration following stand-replacing wildfire. Continuous regeneration of Douglas-fir for many decades following initiating fire was evident in all of the stands. The establishment period averaged 60 (range 32 to 99) years. The pattern observed contrasts both with the view of rapid (one- to two-decade) regeneration of Douglas-fir portrayed in early forestry literature and with reports of establishment periods exceeding 100 years in older (>400 year) Douglas-fir- western hemlock stands. Current intensive production forestry practices directed toward rapid and uniform stand closure following logging have no precedent in the historic natural patterns of Douglas-fir regeneration documented in this study. Conversely, results of this study provide evidence that early seral ecosystems persisted for several decades following wildfires. Patterns of structural development in mid-successional Douglas-fir dominated forests - a period in which forest structures evolve from the relatively simple conditions found in young forests to the complex old forests - is poorly understood. Stand structure and composition was analyzed in nine early old-growth (200 to 350 year old) Douglas-fir-dominated stands in western Washington and Oregon, all of which originated following a single stand-replacement wildfire. Structure and composition of live tree populations (density, diameters, and heights) as well as dead tree structures (snags and logs) were quantified and compared with conditions in previously reported studies of older (400-600-year old) forests. Stand-level attributes were analyzed using descriptive statistics, nonlinear regression, principal components analysis, and two old-growth indices. Variability among stands in specific structural features was large but consistent with the current conceptual model of Douglas-fir forest development. Diameter distributions generally exhibited a reverse-J shape, a characteristic of >450-year-old forests. Douglas-fir populated the tallest height classes and shade-tolerant species (e.g., western hemlock and Pacific silver fir) were present in lower (co-dominant and intermediate) canopy positions. Coarse woody debris was abundant in early old-growth stands in the form of both snags (42-140 m3ha[superscript -1]) and logs (172-584 m3 ha[superscript -1]). Scores for early old-growth stands calculated using existing old-growth structural indices were comparable to those in older (400 to 600year old) forests. The structural conditions and variability in these early old-growth forests are useful guides for managers seeking to accelerate development of complex structures in young Douglas-fir forests.

Book Thinning in Mature Douglas fir Stands in Southwest Oregon

Download or read book Thinning in Mature Douglas fir Stands in Southwest Oregon written by Max Bennett and published by . This book was released on 2018 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is part of the Alternative Forest Management series. It describes a case study on thinning in the mature Douglas-fir stands common to interior southwestern Oregon, many of which have become very dense and are at risk of loss due to wildfire, drought, and insect attack. Following a wide thinning from below, nearly all the trees in the study responded with increased growth and improved resistance to stressors.

Book Forestry Research West

Download or read book Forestry Research West written by and published by . This book was released on 1982-09 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Natural Regeneration of Douglas Fir and Associated Species Using Modified Clear Cutting Systems in the Oregon Cascades Classic Reprint

Download or read book Natural Regeneration of Douglas Fir and Associated Species Using Modified Clear Cutting Systems in the Oregon Cascades Classic Reprint written by Jerry F. Franklin and published by Forgotten Books. This book was released on 2017-10-28 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Natural Regeneration of Douglas-Fir and Associated Species Using Modified Clear-Cutting Systems in the Oregon Cascades The staggered-setting clear cut had only 407 Douglas-fir seedlings per acre and 28 percent of the plots stocked with any Species. Poor stocking is typical of many large clear cuts in this general area. For example, twelve 3 to 5-year-old clear cuts on the experimental forest surveyed in 1956 had an average of only 301 (range 81 to 525) Douglas-fir seed lings per acre. Total plots stocked with any Species averaged 28 (range 11 to 48) percent and plots stocked with Douglas-fir averaged only 24 (range 9 to 36) percent, even though both 1 and 2-year-old seedlings were included in the tally. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book Natural Regeneration in Managed Uneven aged Douglas fir Stands in the IDFdk3 IDFxm and IDFxw Biogeoclimatic Subzones

Download or read book Natural Regeneration in Managed Uneven aged Douglas fir Stands in the IDFdk3 IDFxm and IDFxw Biogeoclimatic Subzones written by Cariboo Forest Region (B.C.). Research Section and published by . This book was released on 1998 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uneven-aged drybelt interior Douglas-fir (Pseudotsuga menziesii var. glauca) stands have been harvested for over 50 years in British Columbia, however, very little information is available on post-harvest natural regeneration success and stand basal area growth rates. In 1995, a retrospective study was initiated to increase understanding of how past harvesting practices have effected natural regeneration establishment and growth within uneven-aged Douglas-fir stands. This extension note summarizes the results from two unpublished reports (Catton 1997; Day 1996). The main results show that natural regeneration was abundant within all the sample blocks.

Book Silviculture for Multiple Objectives in the Douglas fir Region

Download or read book Silviculture for Multiple Objectives in the Douglas fir Region written by and published by . This book was released on 1998 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fifty year Development of Douglas fir Stands Planted at Various Spacings

Download or read book Fifty year Development of Douglas fir Stands Planted at Various Spacings written by Donald L. Reukema and published by . This book was released on 1979 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Recent Changes in Costs of Shipping Forest Products by Rail

Download or read book Recent Changes in Costs of Shipping Forest Products by Rail written by Kristine C. Jackson and published by . This book was released on 1988 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Survey of Factors Affecting Regeneration of Rocky Mountain Douglas fir

Download or read book A Survey of Factors Affecting Regeneration of Rocky Mountain Douglas fir written by Russell A. Ryker and published by . This book was released on 1975 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Structure of Mature Douglas fir Stands in a Western Oregon Watershed and Implications for Interpretation of Disturbance History and Succession

Download or read book Structure of Mature Douglas fir Stands in a Western Oregon Watershed and Implications for Interpretation of Disturbance History and Succession written by Mark Warren Klopsch and published by . This book was released on 1985 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure of a mature Douglas-fir (Pseudotsuga menziesii) forest in a watershed in the western Cascades of Oregon was examined. Two age classes were detected in the stand, the oldest originating about 1855 after an extensive fire and the younger following a second fire about 1895 Although the trees in the older age class had statistically greater diameters and heights, only open grown individuals mixed with the younger age class could be readily distinguished B cause reburns at young ages are common and may not leave firescars, great care is be required to distinguish between slow regeneration and patchy reburns The early stand history varied greatly between the two age classes More than 70% of the trees in the younger portion of the stand were established within a 15 year period while comparable establishment in the older areas required over 35 years The broad range of ages in older age class, combined with significantly lower stocking density and mortality, resulted in a nearly flat diameter distribution compared with a bell-shaped distribution for the younger age class. The stand is heavily dominated by Douglas-fir which accounts for about 90% of the trees in the younger age class and 77% of the trees in the older portions of the stand. The older portion of the drainage has significantly more western hemlock (Tsuga heterophylla) and western dogwood (Cornus nuttalili). The younger portion of the drainage contains more early successional hardwoods including the remnants of a considerable population of bitter cherry (Prunus emarginata) Currently, almost no western redcedar (Thuja plicata) is found in the drainage although old redcedar logs or snags are still present on one quarter of the plots. The abundance of western hemlock and redcedar is much less than similar aged stands in the nearby H.J Andrews Experimental Forest The slow regeneration of the site following the first fire probably reflects a shortage of seed due to a hot burn and dispersal distances four to ten times greater than those reported by Issac (1943) The low abundance of western hemlock and virtual elimination of redcedar are attributed to even greater dispersal distances, low mobility of redcedar seed, and harsh establishment conditions The rapid regeneration following the second fire suggests efficient seed dispersal or storage with young trees and the potential importance of the understory exclusion phase of stand development on regeneration.