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Author : John R. Mills
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (319 download)
Download or read book TRIM Timber Projections written by John R. Mills and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TRIM timber projections written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John R. Mills
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (245 download)
Download or read book TRIM Timber Projections written by John R. Mills and published by . This book was released on 1989 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John R. Mills
Publisher : Forgotten Books
ISBN 13 : 9781396019760
Total Pages : 42 pages
Book Rating : 4.0/5 (197 download)
Download or read book Trim Timber Projections written by John R. Mills and published by Forgotten Books. This book was released on 2018-09-08 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Trim Timber Projections: An Evaluation Based on Forest Inventory Measurements Two consecutive timberland inventories collected from permanent plots in the natural pine type in North Carolina were used to evaluate the timber resource inventory model (trim). This study compares model predictions with field measurements and examines the effect of inventory data aggregation on the accuracy of projections. Pro jections were repeated for two geographic areas with two data aggregation schemes. The sensitivity of the model to harvest was tested with historical and adjusted values. For each simulation, the trim growth projection mechanism was tested with two types of yield tables. Yield tables developed from growth data produced projections that were closer to the measured inventory than did yield tables derived from volume data. This study suggests that timber growth measurements should be incorporated into trim yield tables when stands have the characteristics found in natural pine in North Carolina. The trim system is outlined, and the methods used to derive yield tables are discussed. Keywords: Yield-table projection, growth simulation, growth measurements, inventory data aggregation, inventory models, forest survey, regional timber supply studies, model validation, South. 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 : Philip L. Tedder
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (319 download)
Download or read book The Timber Resource Inventory Model (TRIM) written by Philip L. Tedder and published by . This book was released on 1987 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David J. Brooks
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (319 download)
Download or read book SPATS written by David J. Brooks and published by . This book was released on 1987 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Philip L. Tedder
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (169 download)
Download or read book The Timber Resource Inventory Model (TRIM) written by Philip L. Tedder and published by . This book was released on 1987 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. L. Tedder
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (833 download)
Download or read book The Timber Recource Inventory Model (TRIM) written by P. L. Tedder and published by . This book was released on 1987 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Susan J. Alexander
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (222 download)
Download or read book Sensitivity of TRIM Projections to Management and Stocking Adjustment Assumptions written by Susan J. Alexander and published by . This book was released on 1988 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Timber Resource Inventory Model (TRIM) is a computer model used by the U.S.D.A. Forest Service in assessing the state of the Nation's forest resources and the forests' probable future conditions. TRIM is a yield table projection system designed and developed to model forest inventory changes over time in response to different levels of management and to removals from either large or small forested areas. The purpose of this study was to determine the sensitivity of regional timber availability projections to yield table assumptions and various silvicultural impacts. Yields were projected under various management assumptions. In addition, the yield projections themselves were tested by projecting yields with and without approach to normality. A literature survey was conducted to assess work previously done with changes in management assumptions, model sensitivity, and approach to normality (i.e., stocking adjustment). In the short run, the projections were constrained by current inventory, growth functions, and harvest levels. In the long run, projections were constrained by growth functions and harvest levels. Inventory projections for all species and combined ownership varied both in trend and in degree between runs in both the long and the short run. Growth trends for all species and combined ownership showed normal yields with stocking adjustment and managed yields without stocking adjustment paralleling each other in both the long and the short run. Growth for managed yields with stocking adjustment exceed the two previous management intensities in both the long and the short run. Empirical yields without stocking adjustment are far below normal yields with stocking adjustment and managed yields without stocking adjustment in the short run, but the three projections converge in the long run. It was shown that the difference between runs with and without stocking adjustment is appreciable in both the short and the long run. Limitations of TRIM include the fact that it is difficult to use for the uninitiated, harvest levels are set, and the stocking adjustment function is relatively inflexible.
Author : Susan J. Alexander
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (319 download)
Download or read book Sensitivity of TRIM Projections to Management, Harvest, Yield, and Stocking Assumptions written by Susan J. Alexander and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 590 pages
Book Rating : 4.3/5 (21 download)
Download or read book Forest Growth Modelling and Prediction written by and published by . This book was released on 1988 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Darius M. Adams
Publisher : Springer Science & Business Media
ISBN 13 : 1402063091
Total Pages : 599 pages
Book Rating : 4.4/5 (2 download)
Download or read book Resource and Market Projections for Forest Policy Development written by Darius M. Adams and published by Springer Science & Business Media. This book was released on 2007-09-18 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: The text provides literature surveys on relevant modeling issues and policy concerns. It demonstrates the application of a modeling system using a "base case" 50-year projection and a small set of scenarios. These illustrate, for example, the effects of changes in public harvest policies, variations in investments in silviculture, and globalization. It is aimed at policy makers, researchers and graduate students who are building or using forest sector models.
Author :
Publisher :
ISBN 13 :
Total Pages : 350 pages
Book Rating : 4.:/5 (4 download)
Download or read book Research Paper PNW. written by and published by . This book was released on 1978 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Forest Service
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (319 download)
Download or read book A Summary of the Timber Resource Review written by United States. Forest Service and published by . This book was released on 1958 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 542 pages
Book Rating : 4.F/5 ( download)
Download or read book Sport Fishing written by and published by . This book was released on 1988 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 526 pages
Book Rating : 4.:/5 (4 download)
Download or read book Research Note PNW written by and published by . This book was released on 1988 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John R. Mills
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (167 download)
Download or read book An Evaluation of an Inventory Projection System written by John R. Mills and published by . This book was released on 1987 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the effort to evaluate TRIM (Timber Resource Inventory Model) for the next RPA National Assessment, a study was conducted using natural pine stands in North Carolina. TRIM has been used for regional timber supply studies in both the Pacific Northwest and the South (Southern Timber Supply Study). The model results are tools used for economic planning and policy making for regions in which timber is part of the economic base. TRIM uses yield tables arrayed by age class in the inventory projection calculations. The application of yield tables in TRIM can potentially alter the results of regional timber supply analysis. The objective of this study, is to investigate the TRIM growth mechanism and examine the effects of empirically derived yields on TRIM projections. In this process, different levels of data aggregation were compared and two other types of yield tables were developed and evaluated. Model projections were based on growth and inventory estimates derived from two successive Forest Inventory and Analysis (FIA) inventories. Simulation runs took into account "approach to normality", acreage shifts, and timber removals over the range of age classes as described by field measurements. Results were evaluated based on their comparison to FIA field measurements. In most simulations, TRIM growth and inventory projections were substantially below the growth and inventory values calculated from the Flit data. The projections varied with the yield tables used, but higher yields produced the most favorable results. For a North Carolina timber supply study, these results would indicate a sharp decline in the supply of natural pine which is the opposite of what was recorded in the field. This study suggests that empirical yield curves do not represent aggregate stand growth when stands have the characteristics found in North Carolina's natural pine.
