Download or read book Simulated Long term Effects of Group Selection on Production Efficiency Composition and Structure in Northern Hardwood and Hemlock hardwood Forests written by Corey Halpin and published by . This book was released on 2009 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Forest Research written by and published by . This book was released on 2011 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparative Effects of Single tree and Group Selection on the Diversity and Productivity of Hemlock hardwood Forests written by Christopher R. Webster and published by . This book was released on 2002 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Stand Development and Demographic Sustainability of Tree Populations in Northern Hardwood Forests written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An understanding of trajectories in long-term forest development is essential for examining several fundamental issues in forest ecology and management. Long-term forest development has important implications for issues as diverse as forest productivity, carbon storage, biological diversity, and ecological forestry methods. While much has been learned from studies of old-growth forests, a limitation is that these have necessarily been brief snapshots of species composition and forest structure at one point in time from which accurate trends are difficult to infer. The overarching themes of this dissertation are the long-term trajectory of forest development and the impact of the historic natural disturbance regime on that trajectory. Specific objectives were: (1) to quantify long-term trends in above-ground tree biomass and stand structure in northern hardwood forests, and effects of the natural disturbance regime, (2) to estimate the frequency of structural stand stages, along with residence times and transition rates among stages, under several disturbance regimes, and (3) to develop a quantitative approach to evaluating demographic sustainability of tree populations under several conditions, including those of restricted recruitment. Computer simulation with the CANOPY model was used to clarify long-term trends. However, to the extent possible, these model predictions were verified against available field data, including an extensive field survey and a 30-year record of change on permanent plots in the Porcupine Mountains Wilderness State Park. Major conclusions from this work were: (1) The Bormann-Likens hypothesis of a peak in biomass followed by a decline to a lower level was largely supported by both simulation and field data. The asymptotic biomass trend documented in recent chronosequences may be a consequence of using maximum tree age to estimate stand age. (2) The majority of landscapes of old-growth northern hardwoods is occupied by non-equilibrium stands, but nearly 1/3 was also structurally indistinguishable from steady state. Individual stands were highly dynamic, spending only a few decades in any structural stage. (3) Minimum sustainable tree populations had a variable slope in their size distribution. Enforcing a shallow fixed slope in understory trees typical of those used in uneven-aged management for larger trees rendered the stand unsustainable.
Download or read book Emulating Natural Disturbance Dynamics in Northern Hardwood Forests written by Jacob J. Hanson and published by . This book was released on 2009 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulated Yields for Managed Northern Hardwood Stands written by Dale S. Solomon and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Board-foot and cubic-foot yields developed with the forest growth model SlMTlM are presented for northern hardwood stands grown with and without management. SlMTlM has been modified to include more accurate growth rates by species, a new stocking chart, and yields that reflect species values and quality classes. Treatments range from no thinning to intensive quality product management over a range of sites.
Download or read book EFFECTS OF GROUP SELECTION WITH YELLOW BIRCH BETULA ALLEGHANIENSIS RETENTION ON THE UNDERSTORY AND SAPLING LAYER IN NORTHERN HARDWOOD FORESTS written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Gap partitioning theory predicts that changes in microenvironment conditions found within a forest opening promote diversity in forest ecosystems. Under this theory we would expect to see variations in tree and understory diversity throughout and surrounding a forest opening. In order to test this theory, we examined manmade openings with legacy-tree retention in a northern hardwood forest located in the Upper Peninsula of Michigan. This work is part of an ongoing study that was started in 2003 with the creation of 49 openings centered on a reserve dominant or co-dominant yellow birch (Betula alleghaniensis Britt.). The primary objective of this research was to assess if opening size, plot location and/or plot transect azimuth had an influence on the dependent variables that we measured (herbaceous-layer species, cover groups, and sapling). Twenty reference sites were also selected from the surrounding forest and centered on a dominant or co-dominant yellow birch. At each site, the following variables were measured; herbaceous-layer species percent cover, cover groups (tree seedling ( We found that both opening size and plot location were influential on our measured variables to varying degrees. We found no evidence that transect azimuth was a significant predictor of any of the dependent variables. Opening size was significant when analyzing species diversity and evenness. Plot location was also significant when measuring species diversity as well as richness. Correlations with cover groups varied and some groups were not found to be associated with any of the opening measures (size, location, transect azimuth). Mean tallest tree sapling height was not found to be significantly different among opening sizes, but sapling height was significantly shorter in the references sites than any of the harvested openings. We also found that saplings under the legacy tree were the tallest on average when compared to the opening and the surrounding forest. Maples were by far the most abundance sapling species with sugar maple (Acer saccharum Marsh.) being the most common. Continued monitoring of sapling survival and growth will be important to gain a better understanding of tree diversity in openings with legacy- tree retention and have a better understanding of the future forest composition.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Natural and Anthropogenic Disturbance on the Composition and Structure of the Northern Hardwood Forest written by Anne G. Rhoads and published by . This book was released on 2005 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deciduous Forests of Eastern North America written by E Lucy Braun and published by . This book was released on 2023-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: E. Lucy Braun, PhD, describes in detail the forest ecosystems of eastern North America. This classic reference is well-illustrated with maps and tables. A must for those seeking a deeper understanding of the botanical evolution of this region.
Download or read book Specific Gravity and Other Properties of Wood and Bark for 156 Tree Species Found in North America written by Patrick D. Miles and published by . This book was released on 2009 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Much information is available for specific gravity and other properties of wood and bark, but it is widely scattered in the literature. This paper compiles information for estimation of biomass for 156 tree species found in North America for use in national forest inventory applications. We present specific gravities based on average green volume as well as 12 percent moisture content volume for calculation of oven-dry biomass. Additional information is included on bark thickness, bark voids, and bark percentages by species and green and dry weight of wood and bark. --
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 2000 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Focus written by and published by . This book was released on 1991 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990-02 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silvical Characteristics of American Basswood Tilia Americana written by Harold F. Scholz and published by . This book was released on 1958 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Climate Change Adaptation and Mitigation Management Options written by James M. Vose and published by CRC Press. This book was released on 2013-12-05 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest land managers face the challenges of preparing their forests for the impacts of climate change. However, climate change adds a new dimension to the task of developing and testing science-based management options to deal with the effects of stressors on forest ecosystems in the southern United States. The large spatial scale and complex interactions make traditional experimental approaches difficult. Yet, the current progression of climate change science offers new insights from recent syntheses, models, and experiments, providing enough information to start planning now for a future that will likely include an increase in disturbances and rapid changes in forest conditions. Climate Change Adaptation and Mitigation Management Options: A Guide for Natural Resource Managers in Southern Forest Ecosystems provides a comprehensive analysis of forest management options to guide natural resource management in the face of future climate change. Topics include potential climate change impacts on wildfire, insects, diseases, and invasives, and how these in turn might affect the values of southern forests that include timber, fiber, and carbon; water quality and quantity; species and habitats; and recreation. The book also considers southern forest carbon sequestration, vulnerability to biological threats, and migration of native tree populations due to climate change. This book utilizes the most relevant science and brings together science experts and land managers from various disciplines and regions throughout the south to combine science, models, and on-the-ground experience to develop management options. Providing a link between current management actions and future management options that would anticipate a changing climate, the authors hope to ensure a broader range of options for managing southern forests and protecting their values in the future.
Download or read book Backpacker written by and published by . This book was released on 2007-09 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backpacker brings the outdoors straight to the reader's doorstep, inspiring and enabling them to go more places and enjoy nature more often. The authority on active adventure, Backpacker is the world's first GPS-enabled magazine, and the only magazine whose editors personally test the hiking trails, camping gear, and survival tips they publish. Backpacker's Editors' Choice Awards, an industry honor recognizing design, feature and product innovation, has become the gold standard against which all other outdoor-industry awards are measured.
