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Author : Donald J. DeMars
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (2 download)
Download or read book Stand-density Study of Spruce-hemlock Stands in Southeastern Alaska written by Donald J. DeMars and published by . This book was released on 2000 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald J. DeMars
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (319 download)
Download or read book Stand-density Study of Spruce-hemlock Stands in Southeastern Alaska written by Donald J. DeMars and published by . This book was released on 2000 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 536 pages
Book Rating : 4.E/5 ( download)
Download or read book General Technical Report PNW-GTR written by and published by . This book was released on 2002 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas A. Hanley
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (833 download)
Download or read book Influence of Overstory on Snow Depth and Density in Hemlock-spruce Stands written by Thomas A. Hanley and published by . This book was released on 1987 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wilbur A. Farr
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (319 download)
Download or read book Estimation of decay in old-growth western hemlock and Sitka spruce in southeast Alaska written by Wilbur A. Farr and published by . This book was released on 1976 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas A. Hanley
Publisher : Forgotten Books
ISBN 13 : 9781396230141
Total Pages : 20 pages
Book Rating : 4.2/5 (31 download)
Download or read book Influence of Overstory on Snow Depth and Density in Hemlock-Spruce Stands: Implications for Management of Deer Habitat in Southeastern Alaska (Classic written by Thomas A. Hanley and published by Forgotten Books. This book was released on 2018-09-13 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Influence of Overstory on Snow Depth and Density in Hemlock-Spruce Stands: Implications for Management of Deer Habitat in Southeastern Alaska Mean snow depths in the open ranged from 23 to 94 cm (table Mean snow densities in the open ranged from to g/ cm3. Snow in the forest stands was, on aver age, only 62 percent as deep as that in the open but was of very similar density. Mean snow depths in the open areas and the forest stands were most similar under the deep est conditions and least similar under medium to low depths. Disparities between densi ties in open areas and forest stands were important only under the wettest, densest conditions, when density was greater in the forest than the open. 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.
Author :
Publisher :
ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.:/5 (11 download)
Download or read book Research Paper PNW. written by and published by . This book was released on 1978 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 612 pages
Book Rating : 4.:/5 (89 download)
Download or read book General Technical Report NC. written by and published by . This book was released on 1981 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Susan M. Tait
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (319 download)
Download or read book Occurrence of Insect and Disease Pests on Young-growth Sitka Spruce and Western Hemlock in Southeastern Alaska written by Susan M. Tait and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 320 pages
Book Rating : 4.:/5 (319 download)
Download or read book Integrated Restoration of Forested Ecosystems to Achieve Multiresource Benefits written by and published by . This book was released on 2008 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A primary mission of the U.S. Department of Agriculture Forest Service is multiple resource management, and one of the emerging themes is forest restoration. The National Silviculture Workshop, a biennial event co-sponsored by the Forest Service, was held May 7-10, 2007, in Ketchikan, Alaska, with the theme of "Integrated Restoration of Forested Ecosystems to Achieve Multiresource Benefits." This proceedings presents a compilation of state-of-the-art silvicultural research and forestry management papers that demonstrates integrated restoration to yield multiple resource benefits. These papers highlight national perspectives on ecosystem services, forest restoration and climate change, and regional perspectives on forest restoration and silvicultural practices to achieve multiple resource benefits from researchers and forest practitioners working in a broad array of forest types in the United States."
Author : Wilbur A. Farr
Publisher :
ISBN 13 :
Total Pages : 65 pages
Book Rating : 4.:/5 (518 download)
Download or read book Site Index of Even-aged Hemlock-spruce Stands in Southeast Alaska written by Wilbur A. Farr and published by . This book was released on 1981 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert L. Deal
Publisher :
ISBN 13 :
Total Pages : 382 pages
Book Rating : 4.:/5 (42 download)
Download or read book The Effects of Partial Cutting on Stand Structure and Growth, and Forest Plant Communities of Western Hemlock-Sitka Spruce Stands in Southeast Alaska written by Robert L. Deal and published by . This book was released on 1999 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the effects of partial cutting on stand structure and growth, patterns of conifer regeneration, stand mortality and disease, and understory plant diversity and abundance. Seventy-three 1/5 ha plots were established in 18 partially cut stands throughout southeast Alaska. These stands were partially cut 12 to 96 years ago removing 16 to 96 percent of the original stand basal area. Partial cutting resulted in stands that had complex structures and these structures appear similar to uncut old-growth stands. Sitka spruce was maintained over a wide range of cutting intensities, and conversion to hemlock-dominated stands generally did not occur. New spruce regeneration was established in 23 of 55 partially cut plots compared with new spruce found in only 2 of the 18 uncut plots. The current stand basal area, tree species composition, and stand growth were strongly related to trees left after harvest. Trees that were 10 to 70 cm d.b.h. at time of cutting had the greatest tree diameter growth. Little of the stand growth since harvest came from new regeneration or trees greater than 70 cm d.b.h. The diameter growth of residual hemlock and spruce trees were similar The species richness of vascular plants and bryophytes was similar among uncut and partially cut plots and did not significantly change with different cutting intensities. Overall, plant community structures were similar between the uncut and partially cut plots. However, moderate and heavy cutting intensities resulted in stands that had significantly different plant community composition. The abundance of most deer forage plants did not significantly change after partial cutting. It appears that silvicultural systems that use single tree selection or small openings can be successful for timber management purposes in southeast Alaska. Concerns about changing tree species composition, lack of spruce regeneration, greatly reduced stand growth and vigor, increased dwarf mistletoe infection in hemlock trees, and higher incidence of tree wounding, decay, and mortality with partial cuts were largely unsubstantiated. Stand structural diversity, species richness and understory plant abundance were all greater in partially cut stands than in young-growth stands developing after clearcutting.
Author : Michael H. McClellan
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (319 download)
Download or read book Performance of the SEAPROG Prognosis Variant of the Forest Vegetation Simulator written by Michael H. McClellan and published by . This book was released on 2003 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports the first phase of a recent effort to evaluate the performance and use of the FVS-SEAPROG vegetation growth model. In this paper, we present our evaluation of SEAPROG's performance in modeling the growth of even-aged stands regenerated by clearcutting, windthrow, or fire. We evaluated the model by comparing model predictions to observed values from two sets of long-term permanent plots. We examined six variables: trees per acre, quadratic mean diameter, basal area per acre, height of the largest 40 trees per acre, cubic-foot volume per acre, and board-foot volume per acre. The differences between observed and predicted values were large enough to have important implications for the interpretation and use of the model's predictions. Of even greater importance was the evidence for considerable bias in quadratic mean diameter, basal area, height, and volume, all of which were systematically underestimated. Our results appear to validate the concerns expressed by users.
Author : Patrick J. Baker
Publisher : Springer Nature
ISBN 13 : 3030885550
Total Pages : 340 pages
Book Rating : 4.0/5 (38 download)
Download or read book Forests as Complex Social and Ecological Systems written by Patrick J. Baker and published by Springer Nature. This book was released on 2022-05-17 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professor Chadwick Dearing Oliver has made major intellectual contributions to forest science and natural resources management. Over the course of his career he has actively sought to bring research and practice together through synthesis, outreach, and capacity-building. A common thread throughout his career has been complexity and how we as a society understand and manage complex systems. His work on forest stand dynamics, landscape management, and sustainability have all focused on the emergent properties of complex ecological and/or social systems. This volume celebrates a remarkable career through a diverse group of former students and colleagues who work on a wide range of subject areas related to the management of complex natural resource systems. Over the past decade there has been considerable discussion about forests as complex adaptive systems. Advances in remote sensing, social methods, and data collection and processing have enabled more detailed characterisations of complex natural systems across spatial and temporal scales than ever before. Making sense of these data, however, requires conceptual frameworks that are robust to the complexity of the systems and their inherent dynamics, particularly in the context of global change. This volume presents a collection of cutting-edge research on natural ecosystems and their dynamics through the lens of complex adaptive systems. It includes contributions by a wide range of authors from academia, NGOs, forest industry, and governmental organisations with diverse perspectives on forests and natural resources management. Each chapter offers new insights into how these systems can be made more resilient to ensure that they provide a diversity of ecological and social values well into the future. Together they provide a robust way of thinking about the many challenges that natural ecosystems face and how we as society may best address them.
Author : Louise Simmons Yount Levy Levy
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (664 download)
Download or read book The Density and Distribution of Sitka Spruce and Western Hemlock Seedling Banks in Partially Harvested Stands in Southeast Alaska written by Louise Simmons Yount Levy Levy and published by . This book was released on 2010 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study's objective was to document and describe the current seedling bank of Sitka spruce (Picea sitchensis (Bong.) Carr.) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) stands in southeast Alaska that were partially cut between 1900 and 1984. We investigated the following: (1) What are seedling bank densities? (2) What are seedling size- and age-class distributions? (3) Do seedbed type, treatment, and understory vegetation affect seedling density and species composition? and (4) What are seedling growth rates? Density was high for both Sitka spruce (22,000 seedlings/ha) and western hemlock (223,000 seedlings/ha) and varied widely between sites. There were always fewer spruce than hemlock. Ninety-five percent of spruce and 94 percent of hemlock were less than 0.5 m tall. Spruce had a mean age of 8 years (range 1 to 41 years) and hemlock 19 years (range 1 to 110 years). Both species were four times as common on logs as on undisturbed forest floor. Under closed-canopy conditions at the 15 sites harvested between 1900 and 1958, the average annual height growth rate was 2.3 cm for hemlock and 1.7 cm for spruce. At the two open-canopy sites, harvested in 1983 and 1984, annual height growth rates increased to 8.2 cm for hemlock and 10.2 cm for spruce. Our results suggest that the seedling bank of both species is established and well stocked, thus providing advanced regeneration for the postharvest stand. Because forest managers have increasing concern about effects of clearcut harvesting in Pacific Northwest forest ecosystems and renewed interest in maintaining or restoring biodiversity, other silvicultural methods warrant examination.
Author :
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (7 download)
Download or read book Research Note PNW written by and published by . This book was released on 1997 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (319 download)
Download or read book Proceedings of the Alaska Forest Soil Productivity Workshop written by and published by . This book was released on 1988 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
