A Nonparametric Analysis of Plot Basal Area Growth Using Tree Based Models

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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis A Nonparametric Analysis of Plot Basal Area Growth Using Tree Based Models by : Gary L. Gadbury

Download or read book A Nonparametric Analysis of Plot Basal Area Growth Using Tree Based Models written by Gary L. Gadbury and published by . This book was released on 1998 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tree based statistical models can be used to investigate data structure and predict future observations. We used nonparametric and nonlinear models to reexamine the data sets on tree growth used by Bechtold et al. (1991) and Ruark et al. (1991). The growth data were collected by Forest Inventory and Analysis (FIA) teams from 1962 to 1972 (4th cycle) and 1972 to 1982 (5th cycle). We used tree based models to group observations into clusters that were specified by covariate values. Next, we performed a permutation test on the grouped data to test for a change in tree growth rates from the 4th cycle to the 5th cycle. Our techniques differed from those used by Bechtold et al. (1991) and Ruark et al. (1991). The data was not assumed to follow any parametric distribution, the relation between response and covariates was not assumed to be linear, and the test for a change in tree growth did not require any parametric assumptions. The methodology presented here is general and applicable to other situations where the significance of a specific covariate is in question. Despite these relaxed constraints of analysis, our results generally agreed with those of Bechtold et al. and Ruark et al.

A Nonparametric Analysis of Plot Basal Area Growth Using Tree Based Models

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (17 download)

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Book Synopsis A Nonparametric Analysis of Plot Basal Area Growth Using Tree Based Models by : Gary L. Gadbury

Download or read book A Nonparametric Analysis of Plot Basal Area Growth Using Tree Based Models written by Gary L. Gadbury and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Research Paper RMRS

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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Research Paper RMRS by :

Download or read book Research Paper RMRS written by and published by . This book was released on 1998 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Revisiting the Southern Pine Growth Decline

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ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Revisiting the Southern Pine Growth Decline by : Gary L. Gadbury

Download or read book Revisiting the Southern Pine Growth Decline written by Gary L. Gadbury and published by . This book was released on 2004 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper evaluates changes in growth of pine stands in the state of Georgia, U.S.A., using USDA Forest Service Forest Inventory and Analysis (FIA) data. In particular, data representing an additional 10-year growth cycle has been added to previously published results from two earlier growth cycles. A robust regression procedure is combined with a bootstrap technique to produce estimates of mean growth with confidence intervals for the fourth, fifth, and sixth inventories of natural pine stands sampled between 1961 and 1990. Results suggest that sixth cycle growth rates of pine stands in Georgia remain fairly constant with rates observed in the fifth growth cycle, though they are not up to the level of growth observed in the fourth cycle. Overall, we conclude that growth in the stands screened for this analysis declined between the fourth and fifth cycles but stabilized in the sixth cycle. Inferences cannot be extended to the entire state of Georgia but only to the unknown population represented by the screened dataset of undisturbed natural pine stands. We highlight some specifics on what can and cannot be inferred from FIA data and recommend future actions to increase the chance of detecting changes and revealing factors that might be associated with the changes. The recent switch in FIA to annualized inventories will make it more likely that changes such as these will be easier to detect and interpret in the future.

General Technical Report RMRS

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Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis General Technical Report RMRS by :

Download or read book General Technical Report RMRS written by and published by . This book was released on 1998 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Vegetation of the Glacier Lakes Ecosystem Experiments Site

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ISBN 13 :
Total Pages : 546 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Vegetation of the Glacier Lakes Ecosystem Experiments Site by : Claudia M. Regan

Download or read book Vegetation of the Glacier Lakes Ecosystem Experiments Site written by Claudia M. Regan and published by . This book was released on 1998 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vegetation at the Glacier Lakes Ecosystem Experiment Site, a 600 ha research site at 3200 to 3500 m elevation in the Snowy Range of southeastern Wyoming, was categorized and described from an intensive sampling of species abundances. A total of 304 vascular plant taxa were identified through collection and herbarium documentation. Plots with tree species were separated from those without tree species for ordination and classification analyses. Detrended correspondence analysis was used to order plots along major axes of composition variation, which are inferred moisture and topographic gradients. Cluster analysis was used to categorize plots based on composition similarity. The resulting groups were named according to species dominants. We identified and described in detail 4 meadow, 4 thicket or scrub, 3 krummholz, and 2 forest plant associations.

New Publications

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Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.U/5 (183 download)

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Book Synopsis New Publications by :

Download or read book New Publications written by and published by . This book was released on 1997 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Monthly Catalog of United States Government Publications

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ISBN 13 :
Total Pages : 1076 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Monthly Catalog of United States Government Publications by :

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1998-07 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Designing Multipurpose Resource Inventories Course

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Publisher : Bib. Orton IICA / CATIE
ISBN 13 :
Total Pages : 646 pages
Book Rating : 4./5 ( download)

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Book Synopsis Designing Multipurpose Resource Inventories Course by :

Download or read book Designing Multipurpose Resource Inventories Course written by and published by Bib. Orton IICA / CATIE. This book was released on with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Reliability of Confidence Intervals Calculated by Bootstrap and Classical Methods Using the FIA 1-Ha Plot Design

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ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Reliability of Confidence Intervals Calculated by Bootstrap and Classical Methods Using the FIA 1-Ha Plot Design by : Hans T. Schreuder

Download or read book Reliability of Confidence Intervals Calculated by Bootstrap and Classical Methods Using the FIA 1-Ha Plot Design written by Hans T. Schreuder and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Comprehensive Regional Resource Assessments and Multipurpose Uses of Forest Inventory and Analysis Data, 1976 to 2001

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Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Comprehensive Regional Resource Assessments and Multipurpose Uses of Forest Inventory and Analysis Data, 1976 to 2001 by : Victor A. Rudis

Download or read book Comprehensive Regional Resource Assessments and Multipurpose Uses of Forest Inventory and Analysis Data, 1976 to 2001 written by Victor A. Rudis and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

General Technical Report SRS

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ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis General Technical Report SRS by :

Download or read book General Technical Report SRS written by and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Forest Dynamics, Growth and Yield

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Publisher : Springer Science & Business Media
ISBN 13 : 354088307X
Total Pages : 670 pages
Book Rating : 4.5/5 (48 download)

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Book Synopsis Forest Dynamics, Growth and Yield by : Hans Pretzsch

Download or read book Forest Dynamics, Growth and Yield written by Hans Pretzsch and published by Springer Science & Business Media. This book was released on 2009-06-19 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to improve the understanding of forest dynamics and the sustainable management of forest ecosystems. How do tree crowns, trees or entire forest stands respond to thinning in the long term? What effect do tree species mixtures and multi-layering have on the productivity and stability of trees, stands or forest enterprises? How do tree and stand growth respond to stress factors such as climate change or air pollution? Furthermore, in the event that one has acquired knowledge about the effects of thinning, mixture and stress, how can one make that knowledge applicable to decision-making in forestry practice? The experimental designs, analytical methods, general relationships and models for answering questions of this kind are the focus of this book. Given the structures dealt with, which range from plant organs to the tree, stand and enterprise levels, and the processes analysed in a time frame of days or months to decades or even centuries, this book is directed at all readers interested in trees, forest stands and forest ecosystems. This work has been compiled for students, scientists, lecturers, forest planners, forest managers, and consultants.

Robust Regression Analysis of Growth in Basal Area of Natural Pine Stands in Georgia and Alabama, 1962-72 and 1972-82

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ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Robust Regression Analysis of Growth in Basal Area of Natural Pine Stands in Georgia and Alabama, 1962-72 and 1972-82 by : C. Y. Ueng

Download or read book Robust Regression Analysis of Growth in Basal Area of Natural Pine Stands in Georgia and Alabama, 1962-72 and 1972-82 written by C. Y. Ueng and published by . This book was released on 1997 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling Forest Trees and Stands

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Publisher : Springer Science & Business Media
ISBN 13 : 9048131707
Total Pages : 463 pages
Book Rating : 4.0/5 (481 download)

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Book Synopsis Modeling Forest Trees and Stands by : Harold E. Burkhart

Download or read book Modeling Forest Trees and Stands written by Harold E. Burkhart and published by Springer Science & Business Media. This book was released on 2012-04-27 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drawing upon a wealth of past research and results, this book provides a comprehensive summary of state-of-the-art methods for empirical modeling of forest trees and stands. It opens by describing methods for quantifying individual trees, progresses to a thorough coverage of whole-stand, size-class and individual-tree approaches for modeling forest stand dynamics, growth and yield, moves on to methods for incorporating response to silvicultural treatments and wood quality characteristics in forest growth and yield models, and concludes with a discussion on evaluating and implementing growth and yield models. Ideal for use in graduate-level forestry courses, this book also provides ready access to a plethora of reference material for researchers working in growth and yield modeling.

Using Forest Inventory and Analysis Data and the Forest Vegetation Simulator to Predict and Monitor Fisher (Martes Pennanti) Resting Habitat Suitability

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Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Using Forest Inventory and Analysis Data and the Forest Vegetation Simulator to Predict and Monitor Fisher (Martes Pennanti) Resting Habitat Suitability by :

Download or read book Using Forest Inventory and Analysis Data and the Forest Vegetation Simulator to Predict and Monitor Fisher (Martes Pennanti) Resting Habitat Suitability written by and published by . This book was released on 2010 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: New knowledge from wildlife-habitat relationship models is often difficult to implement in a management context. This can occur because researchers do not always consider whether managers have access to information about environmental covariates that permit the models to be applied. Moreover, ecosystem management requires knowledge about the condition of habitats over large geographic regions, whereas most research projects have limited spatial inference. For example, research has revealed much about the habitat of fishers (Martes pennanti) at various research sites in California, yet this work has not been translated into practical tools that managers can use to monitor fisher habitat regionally, or to evaluate and mitigate the effects of proposed forest management on fisher habitat. This led us to create new habitat models that are intimately linked to agency approaches to forest monitoring and software tools used by forest managers to plan timber harvests and vegetation management. We created habitat models that were integrated with these approaches and tools that forest managers use for two purposes: to inventory forest resources (i.e., Forest Inventory and Analysis [FIA] plots) and to simulate the response of stands to harvest, fire, insects, disease, and other disturbances (i.e., Forest Vegetation Simulator [FVS]). In this paper we provide an example of how to assess and monitor wildlife habitat using FIA vegetation monitoring protocols. We also provide an example of how to integrate an existing FIA-based model of fisher resting habitat into FVS, software that simulates the effect of alternative silvicultural treatments on vegetation data collected from field plots. Using these tools we produce quantitative predictions of the status of resting habitat quality for fishers, and describe how it can be monitored over time. We also provide an example of the effect of vegetation treatments on predicted fisher resting habitat, which illustrates a process that can be used to understand, reduce, or mitigate the effects of these activities on fisher habitat. This work on the fisher provides one example of how habitat assessments for wildlife could be advanced if they were developed with management applicability and implementation success as a goal.

Growth and Ecosystem Services of Urban Trees

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Publisher : MDPI
ISBN 13 : 3039215922
Total Pages : 170 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Growth and Ecosystem Services of Urban Trees by : Thomas Rötzer

Download or read book Growth and Ecosystem Services of Urban Trees written by Thomas Rötzer and published by MDPI. This book was released on 2019-10-23 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerous studies indicate an accelerated growth of forest trees, induced by ongoing climate change. Similar trends were recently found for urban trees in major cities worldwide. Studies frequently report about substantial effects of climate change and the urban heat island effect (UHI) on plant growth. The combined effects of increasing temperatures, changing precipitation patterns, and extended growing season lengths, in addition to increasing nitrogen deposition and higher CO2 concentrations, can increase but also reduce plant growth. Closely related to this, the multiple functions and services provided by urban trees may be modified. Urban trees generate numerous ecosystem services, including carbon storage, mitigation of the heat island effect, reduction of rainwater runoff, pollutant filtering, recreation effects, shading, and cooling. The quantity of the ecosystem services is often closely associated with the species, structure, age, and size of the tree as well as with a tree’s vitality. Therefore, greening cities, and particularly planting trees, seems to be an effective option to mitigate climate change and the UHI. The focus of this Special Issue is to underline the importance of trees as part of the urban green areas for major cities in all climate zones. Empirical as well as modeling studies of urban tree growth and their services and disservices in cities worldwide are included. Articles about the dynamics, structures, and functions of urban trees as well as the influence of climate and climate change on urban tree growth, urban species composition, carbon storage, and biodiversity are also discussed.