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Author: Gary L. Gadbury
Publisher:
ISBN:
Category : Forest surveys
Languages : en
Pages : 16
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Book Description
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.
Author: Gary L. Gadbury
Publisher:
ISBN:
Category : Forest surveys
Languages : en
Pages : 16
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 204
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Book Description
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 122
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 780
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Book Description
Author: Pedro Barbosa
Publisher: John Wiley & Sons
ISBN: 1118253841
Category : Science
Languages : en
Pages : 709
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Book Description
The abundance of insects can change dramatically from generation to generation; these generational changes may occur within a growing season or over a period of years. Such extraordinary density changes or "outbreaks" may be abrupt and ostensibly random, or population peaks may occur in a more or less cyclic fashion. They can be hugely destructive when the insect is a crop pest or carries diseases of humans, farm animals, or wildlife. Knowledge of these types of population dynamics and computer models that may help predict when they occur are very important. This important new book revisits a subject not thoroughly discussed in such a publication since 1988 and brings an international scale to the issue of insect outbreaks. Insect Outbreaks Revisited is intended for senior undergraduate and graduate students in ecology, population biology and entomology, as well as government and industry scientists doing research on pests, land managers, pest management personnel, extension personnel, conservation biologists and ecologists, and state, county and district foresters.
Author: Paul A. Murphy
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 12
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Book Description
Author:
Publisher:
ISBN:
Category : Southern pine beetle
Languages : en
Pages : 284
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Book Description
Author: E Lucy Braun
Publisher:
ISBN: 9781648373107
Category :
Languages : en
Pages : 0
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Book Description
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.
Author: Raymond M. Turner
Publisher: University of Arizona Press
ISBN: 0816546851
Category : Science
Languages : en
Pages : 351
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Book Description
The Changing Mile, originally published in 1965, was a benchmark in ecological studies, demonstrating the prevalence of change in a seemingly changeless place. Photographs made throughout the Sonoran Desert region in the late 1800s and early 1900s were juxtaposed with photographs of the same locations taken many decades later. The nearly one hundred pairs of images revealed that climate has played a strong role in initiating many changes in the region. This new book updates the classic by adding recent photographs to the original pairs, providing another three decades of data and showing even more clearly the extent of change across the landscape. During these same three decades, abundant information about climatic variability, land use, and plant ecology has accumulated, making it possible to determine causes of change with more confidence. Using nearly two hundred additional triplicate sets of unpublished photographs, The Changing Mile Revisited utilizes repeat photographs selected from almost three hundred stations located in southern Arizona, in the Pinacate region of Mexico, and along the coast of the Gulf of California. Coarse photogrammetric analysis of this enlarged photographic set shows the varied response of the region's major plant species to the forces of change. The images show vegetation across the entire region at sites ranging in elevation from sea level to a mile above sea level. Some sites are truly arid, while others are located above the desert in grassland and woodland. Common names are used for most plants and animals (with Latin equivalents in endnotes) to make the book more accessible to non-technical readers. The original Changing Mile was based upon a unique set of data that allowed the authors to evaluate the extent and magnitude of vegetation change in a large geographic region. By extending the original landmark study, The Changing Mile Revisited will remain an indispensable reference for all concerned with the fragile desert environment.
Author: Karen Tranberg Hansen
Publisher: Nordic Africa Institute
ISBN: 9789171065186
Category : Political Science
Languages : en
Pages : 240
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Book Description
This book brings together two bodies of research on urban Africa that have tended to be separate, studies of urban land use and housing and studies of work and livelihoods. Africa's future will be increasingly urban, and the inherited legal, institutional and financial arrangements for managing urban development are inadequate. Access to employment, shelter and services is precarious for most urban residents. The result is the phenomenal growth of the informal city. Extra-legal housing and unregistered economic activities proliferate and basic urban services are increasingly provided informally. Recent decades of neo-liberal political and economic reforms have increased social inequality across urban space. After an introductory chapter by the editors, the contributions are grouped into the following sections: - LOCALITY, PLACE, AND SPACE - ECONOMY, WORK, AND LIVELIHOODS - LAND, HOUSING, AND PLANNING The case studies are drawn from a diverse set of cities on the African continent. A central theme is how practices that from an official standpoint are illegal or extra-legal do not only work but are considered legitimate by the actors concerned. Another is how the informal city is not exclusively the domain of the poor, but also provides shelter and livelihoods for better-off segments of the urban population.
