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Estimating Aboveground Tree Biomass On Forest Land In The Pacific Northwest A Comparison Of Approaches
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Book Synopsis Estimating Aboveground Tree Biomass on Forest Land in the Pacific Northwest: A Comparison of Approaches by :
Download or read book Estimating Aboveground Tree Biomass on Forest Land in the Pacific Northwest: A Comparison of Approaches written by and published by DIANE Publishing. This book was released on with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating aboveground tree biomass on forest land in the Pacific Northwest by : X. Zhou
Download or read book Estimating aboveground tree biomass on forest land in the Pacific Northwest written by X. Zhou and published by . This book was released on 2009 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating Aboveground Tree Biomass on Forest Land in the Pacific Northwest by :
Download or read book Estimating Aboveground Tree Biomass on Forest Land in the Pacific Northwest written by and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Paper PNW. written by and published by . This book was released on 1978 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating Tree Biomass, Carbon, and Nitrogen in Two Vegetation Control Treatments in an 11-year-old Douglas-fir Plantation on a Highly Productive Site by : Warren D. Devine
Download or read book Estimating Tree Biomass, Carbon, and Nitrogen in Two Vegetation Control Treatments in an 11-year-old Douglas-fir Plantation on a Highly Productive Site written by Warren D. Devine and published by . This book was released on 2013 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: We sampled trees grown with and without competing vegetation control in an 11-year-old Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) plantation on a highly productive site in southwestern Washington to create diameter- based allometric equations for estimating individual-tree bole, branch, foliar, and total aboveground biomass. We used these equations to estimate per-hectare aboveground biomass, nitrogen (N), and carbon (C) content, and compared these results to (1) estimates based on biomass equations published in other studies, and (2) estimates made using the mean-tree method rather than allometric equations. Component and total-tree biomass equations were not influenced by the presence of vegetation control, although per-hectare biomass, C, and N estimates were greater where vegetation control was applied. Our biomass estimates differed from estimates using previously published biomass equations by as much as 23 percent. When using the mean-tree biomass estimation approach, we found that incorporating a previously published biomass equation improved accuracy of the mean-tree diameter calculation.
Book Synopsis Forests of Western Oregon by : Sally J. Campbell
Download or read book Forests of Western Oregon written by Sally J. Campbell and published by . This book was released on 2002 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forest Operations, Engineering and Management by : Raffaele Spinelli
Download or read book Forest Operations, Engineering and Management written by Raffaele Spinelli and published by MDPI. This book was released on 2018-09-19 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Forest Operations, Engineering and Management" that was published in Forests
Book Synopsis Live-tree Carbon in the Pacific Northwest by : Susanna L. Melson
Download or read book Live-tree Carbon in the Pacific Northwest written by Susanna L. Melson and published by . This book was released on 2004 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concentration of carbon dioxide (CO2) in the atmosphere has increased over the past 150 years. Because CO2 is one of a number of radiatively active gases, there is concern that global temperatures will rise and climatic conditions will change. Recent research indicates northern hemisphere forests may currently be accumulating carbon (C) from the atmosphere. Live trees hold a large proportion of forest C, however, live-tree C can only be measured indirectly and therefore estimates of live-tree C are subject to numerous uncertainties. The objectives of this research were to estimate how live-tree C stores changed in the Pacific Northwest (Oregon and Washington west of the Cascade crest) between 1963-91 and to assess the factors introducing uncertainty into the estimate of live-tree C storage. The first objective was accomplished by using data from the Forest Service Forest Inventory and Analysis Program (FIA), combined with western Oregon and western Washington annual timber harvest data. The study produced live-tree C estimates for all timberland by land-ownership group. Between 1963-91, C on all timberland in the Pacific Northwest decreased from 1636 to 1392 Tg, or by 15% of the 1963 total. National forest, other public (other federal, state, and local government), forest industry, and miscellaneous private land lost 15, 5 (non-significant), 24, and 18% of their 1963 total timberland live-tree C by 1991, respectively. All landowners except industry experienced significant declines in total timberland area. C density (live-tree C per area) on all timberland dropped by 13% on national forests and by 30% on forest industry, but rose by 1% (non-significant) on other public and 26% on miscellaneous private land. For the Pacific Northwest as a whole, C density on all timberland decreased by 8% over the 28-year study period. C density declined most dramatically between 1963 and 1974. Since 1974, increasing C density on other public and miscellaneous private land balanced declining C density on national forest and forest industry land, resulting a C density ranging between 135-136 Mg C ha−1 on all timberland. The live-tree C estimate is subject to uncertainty arising from sampling, regression, measurement, and model error. We created and implemented a method for assessing uncertainty arising from model error. Volume equations, densities, biomass equations, and C:biomass ratios were compiled for the five major tree species in northwest Oregon: Picea sitchensis, Pseudotsuga menziesii, Tsuga heterophylla, Acer macrophyllum, and Alnus rubra. Volume equations were transformed into biomass by multiplying predicted volume with a range of species-specific measured densities. Biomass derived from volume equations multiplied by densities or from biomass equations was converted to C using a range of C:biomass ratios. For each tree component, species, and diameter at breast height, the maximum and minimum C predicted by equations was captured and stored as lookup tables. Component lookup tables were summed to create estimates of tree total C under three assumptions about within-dbh class correlation between components: perfect positive, zero, or perfect negative correlation. Application of lookup table bounds to individual tree data from the FIA program produced estimates of minimum and maximum C for the five target species in northwest Oregon. The above methods resulted in a base-case live-tree C estimate for northwest Oregon ranging from 28-210 Tg C (±76% uncertainty) assuming perfect positive correlation, and 67-1 54 Tg C (±40% uncertainty) for perfect negative correlation. When height variation was incorporated, C storage uncertainty rose to ±91% for positive and ±51% for negative correlation. A gain in precision was realized when species-specific equations were applied. Replacement of diameter-distribution data by quadratic mean diameter for each species reduced the absolute value of uncertainty, but created a bias when compared to the base case. Our attempt to incorporate regression standard error produced extremely large uncertainties for some equations and therefore was not pursued further. Results indicate that the most substantial reductions in uncertainty could be obtained by accurately assigning individual trees to suitable equations. The magnitude of model error produced by our methods currently precludes determination of significant differences between live-tree C stores of most landowners in the Pacific Northwest, and renders impossible the precise determination of the amount of live-tree C in a given forest area. Nevertheless, this does not necessarily preclude meaningful comparisons of C flux. Results of this study indicate uncertainty from model error in live-tree C could be extremely large. However, by accurately assigning appropriate volume or biomass prediction equations to trees, uncertainty could be greatly reduced.
Book Synopsis Aboveground Tree Biomass on Productive Forest Land in Alaska by : John Yarie
Download or read book Aboveground Tree Biomass on Productive Forest Land in Alaska written by John Yarie and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strategies for Sampling and Estimation of Aboveground Tree Biomass by : Krishna Prasad Poudel
Download or read book Strategies for Sampling and Estimation of Aboveground Tree Biomass written by Krishna Prasad Poudel and published by . This book was released on 2015 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The issue of global climate change and an increasing interest in the reduction of fossil fuel carbon dioxide emissions by using forest biomass for energy production has increased the importance of quantifying forest biomass in recent years. The official U.S. forest carbon reporting is based on the forest biomass estimates obtained from the equations, sample tree measurements, and forest area estimates of the U.S. Forest Service, Forest Inventory and Analysis (FIA). These biomass estimates differ from the estimates obtained from regional and other commonly used biomass equations and the difference is more evident in the component biomass estimates. In this dissertation, I assessed the efficiency of different sampling strategies to estimate crown biomass using data collected destructively from sampled trees. In terms of bias and root mean squared errors (RMSE), the stratified random sampling with probability proportional to branch basal diameter was better than other methods when 3 or 6 branches per tree are sampled but a systematic sampling with ratio estimation technique produced the smallest RMSE when 9 or 12 branches per tree are sampled. Total and component aboveground biomass estimates were obtained using the existing approaches and locally fitted equations based on the data collected in this study. The use of existing equations resulted in biased component biomass estimates along with higher RMSE. The locally fitted system of component biomass equations with seemingly unrelated regression (SUR) provided better estimates than existing equations. The need to use other explanatory variables in addition to the diameter at breast height (DBH) to estimate component biomass was justified by decrease in RMSE. Beta, Dirichlet, and multinomial loglinear regressions that predict proportion of biomass in each component were unbiased and produced lower RMSEs compared to the SUR methods for most of the species-component combinations. Three different methods for adjusting regional volume and component biomass equations were applied. All the adjustment methods were able to improve the performance of regional equations. Based on the leave one out cross validation, the RMSEs in cubic volume including top and stump (CVTS) and component biomass estimation were similar for the adjustments from a correction factor based on ordinary least square (OLS) regression through origin and an inverse approach. The adjustment based on OLS with intercept did not perform as well as the other two adjustment methods. When only one tree is available for calibration of regional models, we found it useful to use the tree with maximum DBH to calibrate regional CVTS and bark biomass equations and the dominant tree to calibrate bole, foliage, and branch biomass rather than to use randomly selected one tree.
Book Synopsis Methods for Calculating Forest Ecosystem and Harvested Carbon with Standard Estimates for Forest Types of the United States by :
Download or read book Methods for Calculating Forest Ecosystem and Harvested Carbon with Standard Estimates for Forest Types of the United States written by and published by . This book was released on 2006 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents techniques for calculating average net annual additions to carbon in forests and in forest products. Forest ecosystem carbon yield tables, representing stand-level merchantable volume and carbon pools as a function of stand age, were developed for 51 forest types within 10 regions of the United States. Separate tables were developed for afforestation and reforestation. Because carbon continues to be sequestered in harvested wood, approaches to calculate carbon sequestered in harvested forest products are included. Although these calculations are simple and inexpensive to use, the uncertainty of results obtained by using representative average values may be high relative to other techniques that use site- or project-specific data. The estimates and methods in this report are consistent with guidelines being updated for the U.S. Voluntary Reporting of Greenhouse Gases Program and with guidelines developed by the Intergovernmental Panel on Climate Change. The CD-ROM included with this publication contains a complete set of tables in spreadsheet format.
Download or read book Tree Biomass written by and published by . This book was released on 1981 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methods to Estimate Total Forest Biomass for Extensive Forest Inventories by : Eric H. Wharton
Download or read book Methods to Estimate Total Forest Biomass for Extensive Forest Inventories written by Eric H. Wharton and published by . This book was released on 1993 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Existing literature on procedures for estimating tree biomass for northeastern tree species includes a number of research studies that are specific and localized. As a result, there is little consistency in these estimation procedures, which are largely in the form of regression equations. In addition, many species are ignored that need to be quantified when inventories of forest resources are conducted over extensive areas. This makes it difficult to determine the most appropriate biomass-estimation procedures. In this paper, an evaluation is made of prediction models and their application over the entire range of northeastern tree species. Recommendations are also made on procedures for the more nontimber oriented elements of total forest biomass-shrub biomass, foliage biomass, stump and root biomass, and biomass on unproductive forest land.
Book Synopsis Methods and Equations for Estimating Aboveground Volume, Biomass, and Carbon for Trees in the U.S. Forest Inventory, 2010 by : United States Department of Agriculture
Download or read book Methods and Equations for Estimating Aboveground Volume, Biomass, and Carbon for Trees in the U.S. Forest Inventory, 2010 written by United States Department of Agriculture and published by CreateSpace. This book was released on 2015-01-02 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Forest Service, Forest Inventory and Analysis (FIA) program uses numerous models and associated coefficients to estimate aboveground volume, biomass, and carbon for live and standing dead trees for most tree species in forests of the United States. The tree attribute models are coupled with FIA's national inventory of sampled trees to produce estimates of tree growing-stock volume, biomass, and carbon, which are available in the Forest Inventory and Analysis database (FIADB; http: //fi atools.fs.fed.us). To address an increasing need for accurate and easy-to-use documentation of relevant tree attribute models, needed individual tree gross volume, sound volume, biomass (including components), and carbon models for species in the United States are compiled and described in this publication with accompanying electronic fi les on a CD-ROM included with the publication. This report describes models currently in use as of 2010. These models are subject to change as the FIADB and associated tree attribute models are improved
Book Synopsis Forest Biometrics by : Michail Prodan
Download or read book Forest Biometrics written by Michail Prodan and published by Elsevier. This book was released on 2013-10-22 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest Biometrics presents the methods of mathematical statistics and biometrics that are significant to forestry. This book explores other fields related to forestry, which are explained with the help of a large number of practical examples. Organized into 25 chapters, this book starts with an overview of the variety of data that play a significant role in forest management, including the age of trees, the damage caused by storms, the fluctuation of timber prices, bark beetle infestation, and timber volume. This text then examines the factors that are responsible for a random distribution of the values in biological experimentation. Other chapters consider the important advantages of sample surveys compared to complete enumerations, include cheaper samples, wider applicability, quick results, and greater accuracy. The final chapter deals with the factors to be considered in determining the best time for harvesting of timber. This book is a valuable resource for students, research project leaders, and practical workers.
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 2016 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Growth and Allocation of Woody Biomass in Forest Trees Based on Environmental Conditions by : Luigi Todaro
Download or read book Growth and Allocation of Woody Biomass in Forest Trees Based on Environmental Conditions written by Luigi Todaro and published by MDPI. This book was released on 2021-04-23 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest ecosystems are important because of the key role in reducing atmospheric greenhouse gas concentrations by storing a large amount of carbon in biomass and soils. The relative amount of above-ground biomass allocated among different tree tissues is a functional indicator of forests’ health reflecting the material flow, the wood quality and the plant survival strategy. The way in which plants steer their photosynthetic product across their compartments is not fixed but likely vary over time, across growth economies and among species and, lastly, is influenced by plant size and climate, Obtaining a qualitative/quantitative understanding of the influence that these factors have in both growth and biomass allocation is of fundamental importance either in understanding plant ecology and evolution and into developing environmental policies and useful forest management practices to cope with future climate change.
