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Height Diameter Equations For Six Species In The Coastal Regions Of The Pacific Northwest
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Book Synopsis Height-diameter Equations for Six Species in the Coastal Regions of the Pacific Northwest by : Mark L. Hanus
Download or read book Height-diameter Equations for Six Species in the Coastal Regions of the Pacific Northwest written by Mark L. Hanus and published by . This book was released on 1999 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three equations for predicting tree height as a function of diameter (outside bark) at breast height are presented for six species found in coastal regions of the Pacific Northwest. 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 the relationship between a tree's height and diameter depends on the tree's competitive position within the stand, alternative equations, including the average height and average diameter of the 40 largest-diameter trees/ac, are also presented. These equations are used in the Stand Management Cooperative version of ORGANON.
Book Synopsis Forest Growth and Yield Modeling by : Aaron R. Weiskittel
Download or read book Forest Growth and Yield Modeling written by Aaron R. Weiskittel and published by John Wiley & Sons. This book was released on 2011-08-22 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest Growth and Yield Modeling synthesizes current scientific literature and provides insights in how models are constructed. Giving suggestions for future developments, and outlining keys for successful implementation of models the book provides a thorough and up-to-date, single source reference for students, researchers and practitioners requiring a current digest of research and methods in the field. The book describes current modelling approaches for predicting forest growth and yield and explores the components that comprise the various modelling approaches. It provides the reader with the tools for evaluating and calibrating growth and yield models and outlines the steps necessary for developing a forest growth and yield model. Single source reference providing an evaluation and synthesis of current scientific literature Detailed descriptions of example models Covers statistical techniques used in forest model construction Accessible, reader-friendly style
Book Synopsis Forest Analytics with R by : Andrew P. Robinson
Download or read book Forest Analytics with R written by Andrew P. Robinson and published by Springer Science & Business Media. This book was released on 2010-11-05 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest Analytics with R combines practical, down-to-earth forestry data analysis and solutions to real forest management challenges with state-of-the-art statistical and data-handling functionality. The authors adopt a problem-driven approach, in which statistical and mathematical tools are introduced in the context of the forestry problem that they can help to resolve. All the tools are introduced in the context of real forestry datasets, which provide compelling examples of practical applications. The modeling challenges covered within the book include imputation and interpolation for spatial data, fitting probability density functions to tree measurement data using maximum likelihood, fitting allometric functions using both linear and non-linear least-squares regression, and fitting growth models using both linear and non-linear mixed-effects modeling. The coverage also includes deploying and using forest growth models written in compiled languages, analysis of natural resources and forestry inventory data, and forest estate planning and optimization using linear programming. The book would be ideal for a one-semester class in forest biometrics or applied statistics for natural resources management. The text assumes no programming background, some introductory statistics, and very basic applied mathematics.
Book Synopsis Equations for Predicting Height-to-crown-base, 5-year Diameter-growth Rate, 5-year Height-growth Rate, 5-year Mortality Rate, and Maximum Size-density Trajectory for Douglas-fir and Western Hemlock in the Coastal Region of the Pacific Northwest by : David W. Hann
Download or read book Equations for Predicting Height-to-crown-base, 5-year Diameter-growth Rate, 5-year Height-growth Rate, 5-year Mortality Rate, and Maximum Size-density Trajectory for Douglas-fir and Western Hemlock in the Coastal Region of the Pacific Northwest written by David W. Hann and published by . This book was released on 2003 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using existing permanent research plot data, we developed equations for predicting height-to-crown-base (HCB), 5-yr diametergrowth rate (delta D), 5-yr height-growth rate (delta H), 5-yr mortality rate (PM), and the maximum size-density trajectory for Douglasfir and western hemlock in the coastal region of the Pacific Northwest. With the exception of the HCB equation, the equations developed for predicting trees from untreated plots agreed in predictive behavior with previously published equations for the study area. The HCB equation predicted shorter HCB (and therefore longer crown lengths [CL]) than previously published equations for the study area. Western hemlock showed no response to fertilization. Modifiers for fertilization response were incorporated into the final equations for predicting delta D, delta H, and PM in Douglas-fir. All three modifiers for Douglas-fir predicted an increase in growth and mortality rates with the amount of nitrogen applied and a decrease with number of years since fertilization, with most of the fertilization effect gone within 15 yr of application. For the delta D and delta H modifiers, the size of the increase varied by the site index (SI) of the plot, with plots of lower site quality showing greater increases. For delta D, fertilization response did not appear to vary by plot density, tree size, or tree position within the plot. Modifiers for thinning response were incorporated into the final equations for predicting tree delta D for both species and delta H for Douglas-fir. For both species, the delta D thinning-effects modifier predicted an increased growth rate with the proportion of the BA removed and a decrease with years since thinning; most of the thinning effect was gone within 10 yr. For Douglas-fir, the delta H thinning-effects modifier predicted a reduced growth rate immediately after thinning, with the size of the reduction increasing with the intensity of thinning. Most of the reduction was gone by about 10 yr. For Douglas-fir, the combined effect on delta D and delta H of applying both thinning and fertilization could be adequately characterized by the product of the thinning modifier and the fertilization modifier. The percent increase in predicted growth rate due to a combined treatment thus was greater than the sum of the percent increases for each treatment alone. Analysis of the maximum size-density trajectory data strongly suggests that plots of neither species approach a single maximum stand density index value (SDI) as they develop. The potential yield for a given site therefore depends, not only on its SI, but also on its maximum SDI. Fertilization does not appear to affect the intercept of the maximum size-density line for Douglas-fir. The strengths and weaknesses of the existing data sets and the modeling and analytical approaches tested during development of these equations are presented to aid future modelers, and alternative modeling approaches are explored.
Book Synopsis Predicting Height for Undamaged and Damaged Trees in Southwest Oregon by : Mark L. Hanus
Download or read book Predicting Height for Undamaged and Damaged Trees in Southwest Oregon written by Mark L. Hanus and published by . This book was released on 1999 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equations for predicting tree height as a function of diameter outside bark at breast height are presented for various tree species common to southwest Oregon. Data for damaged and undamaged trees were analyzed with weighted nonlinear regression techniques. The effects of specific damaging agents and their severity on the height-diameter relationship were explored. Damage correction multipliers were estimated, then used to correct predicted height where damage was noted. Because the relationship between height and diameter changes with the competitive position of the tree in a stand, alternative equations are presented that include the average height and diameter of the 40 largest-diameter undamaged conifer trees per acre. Foresters can use these "height-diameter" equations to reduce the time-consuming task of measuring heights of every tree in an inventory, stand exam, or timber cruise. They can also use these equations to estimate the change in height as diameter changes. These equations will be incorporated into the new southwest Oregon version of ORGANON, which extends the model to older stands and stands with a heavier component of hardwood species.
Download or read book Northwest Science written by and published by . This book was released on 2007 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Contribution written by and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Canadian Journal of Forest Research by :
Download or read book Canadian Journal of Forest Research written by and published by . This book was released on 2008 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Application of a Process-based, Basin-scale Stream Temperature Model by : Douglas McKinnon Allen
Download or read book Development and Application of a Process-based, Basin-scale Stream Temperature Model written by Douglas McKinnon Allen and published by . This book was released on 2008 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sustainable Forestry written by and published by CABI. This book was released on 2007 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of forest sustainability, this book presents the issues related to both global climate change and conservation of biodiversity. It highlights four methodologies and shows how they contribute in overcoming the ecological challenges facing our world. The practical experience presented can be applied to the implementation of successful sustainable forestry policies.
Book Synopsis Licensing News by : California. Professional Foresters Registration
Download or read book Licensing News written by California. Professional Foresters Registration and published by . This book was released on 2000 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhanced Height-growth-rate Equations for Undamaged and Damaged Trees in Southwest Oregon by : David W. Hann
Download or read book Enhanced Height-growth-rate Equations for Undamaged and Damaged Trees in Southwest Oregon written by David W. Hann and published by . This book was released on 2002 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equations for predicting the 5-yr height growth rate of a tree are presented for six conifer species from southwest Oregon. Equations for the combination of undamaged and damaged trees were estimated with weighted nonlinear regression techniques. These equations are being incorporated into the new southwest Oregon version of ORGANON, a model for predicting the development of stands. The equations extend the previous model to older stands and to stands with a heavier component of hardwood tree species. The effects of specific damaging agents on the 5-yr height growth rate were explored for Douglas-fir, the most frequently encountered species, and damage correction factors were estimated. The findings of this analysis indicated that damaging agents can have a significant impact upon 5-yr height growth rate, and as a result, they can lead, over time, to diversification in within-stand structure. Therefore, a full characterization of stand development should include the prediction of the presence and frequency of the various damaging agents affecting trees within the stand and their subsequent impact upon tree attributes such as total height, height to crown base, diameter growth rate, height growth rate, and mortality rate.
Book Synopsis Bibliography of Agriculture with Subject Index by :
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 2000 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Budbreak Sprays for Site Preparation and Release from Six Coastal Brush Species by : Ronald Eugene Stewart
Download or read book Budbreak Sprays for Site Preparation and Release from Six Coastal Brush Species written by Ronald Eugene Stewart and published by . This book was released on 1974 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Initial and Continued Effects of a Release Spray in a Coastal Oregon Douglas-fir Plantation by : Richard E. Miller
Download or read book Initial and Continued Effects of a Release Spray in a Coastal Oregon Douglas-fir Plantation written by Richard E. Miller and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Regression Modeling by : David A. Ratkowsky
Download or read book Nonlinear Regression Modeling written by David A. Ratkowsky and published by . This book was released on 1983 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to regression models; Assessing nonlinearity in nonlinear regression models; Yield-density models; Sigmoidal growth models; Asymptotic regression model; Some miscellaneous models; Comparing parameter estimates from more than one data set; Obtaining good initial parameter estimates; Summary: towatd a unified approach to nonlinear regression modeling.
Book Synopsis Inventorying Forest and Other Vegetation of the High Latitude and High Altitude Regions by : Vernon J. LaBau
Download or read book Inventorying Forest and Other Vegetation of the High Latitude and High Altitude Regions written by Vernon J. LaBau and published by Society of American Foresters.. This book was released on 1984 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
