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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A conspiracy of optimism: Sustained yield, multiple use, and intensive management on the national forests, 1945-1991.

Hirt, Paul Wayne. January 1991 (has links)
This is a historical study of the intersection of political economy with natural resources management, as played out on the national forests between 1945-1991. Specifically, it focuses on two core national forest management policies; sustained yield and multiple use. These two policy directives represent an attempt by the public and elected officials to apply principles of sustainable development to publicly-owned forest lands, and to ensure that a wide variety of both market and nonmarket forest values are preserved for the benefit of present and future generations. Interest groups, the Forest Service, and policy makers have conceived of sustained yield and multiple use in different and evolving ways over the years. This study explores how these principles have been variously defined and either implemented or thwarted. After World War Two, with escalating demands on national forest resources, the U.S. Forest Service turned to "intensive management" as a technological method of enhancing natural forest productivity and mitigating the environmental effects of increased use. But the agency's optimistic vision of efficient, sustained production of forest commodities through technical mastery over nature has met overwhelming fiscal, environmental, technical, and political obstacles. Nevertheless, agency leaders, industry advocates, and politicians have consistently promulgated an optimistic faith that intensive applications of labor, capital, and technology can maximize and harmonize multiple uses, rehabilitate damaged resources, and sustain high levels of outputs in perpetuity--despite repeated failures to achieve balanced multiple use management and to manage grazing and timber extraction at sustainable levels. The conspiracy of optimism ideologically justifies continued unsustainably high levels of resource extraction. Changing public values since the 1960s and the popularization of ecology have initiated a growing skepticism toward the premises of intensive management. At the same time, field level forest managers have grown frustrated with top-down imposition of resource production quotas and the lack of adequate political, fiscal, and organizational support for sound forest management. As the last old growth forests fall to the chainsaw, and as the federal subsidies required to access these remote timber stands on the national forests escalate, public controversy deepens. In this decade of the national forest centennial a revolt of conscience has erupted among grassroots Forest Service personnel, and a strong challenge from the environmental community has gained momentum. Another major period of policy evaluation and revision appears to be taking place. Whether the conspiracy of optimism can continue to sustain the old status quo is questionable.
2

Developing a spatial decision support system for timber sale planning on a national forest

Kenney, David Peter 30 December 2008 (has links)
Resource planning on National Forests has become a complex and time consuming process. On the Jefferson National Forest (JNF), "Opportunity Area Analysis" (OAA) is used to implement the resource use mandates of the JNF Land and Resource Management Plan. Timber sale planning is an important component of the OAA process that requires the evaluation and analysis of large amounts of site-specific data and complex spatial relationships. Since geographic information systems (GIS) can manage spatial information efficiently, a prototype spatial decision support system (SDSS) was developed that integrates the data, GIS analysis routines, graphical map and tabular displays, and user interface utilities to interactively support the timber sale planning process. The objectives of this research are: (1) to model the timber sale planning decision process, (2) develop the SDSS model, (3) demonstrate the use of SDSS on a case study area in the JNF, and (4) compare the SDSS approach to current manual methods for timber sale planning. The SDSS model is structured to assist the planner in four areas: (1) identification of suitable stands for timber sale planning in the opportunity area, (2) evaluation and analysis of environmental and social objectives specific to each candidate stand, (3) economic analysis of the candidate stands, and (4) development of timber sale alternatives for a short term planning period. When compared to the manual methods currently used, the SDSS approach to timber sale planning provides faster access to current resource information, helps define and structure the timber sale planning process,a1lows flexibility in plan development, and assembles information for map production and report generation. Recommendations for future SDSS research are also discussed. / Master of Science
3

The impact of subsistence use of forest products and the dynamics of harvested woody species populations in a protected forest reserve in Western Zimbabwe

Mudekwe, John 03 1900 (has links)
Thesis (PhD (Forest and Wood Science))—University of Stellenbosch, 2007. / Developing sustainable mechanisms for use-management of forest products by user communities has been suggested as a possible solution to the often-observed conflict between forest use and the conservation of protected forests. In Zimbabwe, the use of forest products in protected forests by local communities has a long history, but few studies have explored both the socio-economic and ecological aspects of this use. This study was conducted in the Baikiaea plurijuga forests and woodlands in and around Fuller Forest in western Zimbabwe, protected since 1943. It explored the characteristics and dynamics of forest products use by communities surrounding this protected forest. Further, the demography and dynamics of commonly harvested woody species was examined in order to establish the present status of populations of these species. This examination, focusing on diameter class distributions, was aimed at informing whether species populations were expanding, stable or declining in view of their capacity to continue providing required goods and services. Results indicated that all households, rich and poor, were harvesting at least some forest resources from the protected forest, with the most frequently harvested resources being firewood, wood for curios, thatch grass, wild fruits, timber for construction and fencing and those who owned livestock used the forest for livestock grazing. The extraction and use of 23 different products was recorded across the villages. The top five harvested forest products in terms of the mean proportion of households using them were fuelwood, building poles, thatch grass, wild fruits and broom grass. Forest products were harvested both for own consumption and for sale. At present Baikiaea plurijuga, Colophospermum mopane, Brachystegia spiciformis, Diplorhynchus condylocarpon, Commiphora mocambicensis and Bauhinia petersiana out of 14 commonly harvested species appear to have relatively stable populations as indicated by their inverse J-shaped diameter class distribution profiles. Preliminary indications from this baseline information point towards the successful integration of local use of forest products and conservation objectives noting that there is need for caution until further studies as recommended in this study are taken.

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