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Articles 1 - 11 of 11
Full-Text Articles in Forest Sciences
Evaluating Shade Bias In Insect Trap Catch And Assessing The Short- And Long-Term Impacts Of Herbicide Application In Regenerating Clearcuts On Flowering Plant Communities, Kathryn M. Georgitis
Evaluating Shade Bias In Insect Trap Catch And Assessing The Short- And Long-Term Impacts Of Herbicide Application In Regenerating Clearcuts On Flowering Plant Communities, Kathryn M. Georgitis
Electronic Theses and Dissertations
Regenerating clearcuts are commonly sprayed with a broad-spectrum herbicide, Glyphosate, to suppress regenerating hardwoods that outcompete the more desirable softwood species. Although the direct effects of herbicide application are minimal, the resulting changes in vegetation have raised concern over its indirect effects on wildlife. On the other hand, clearcuts are high in plant diversity, which may provide beneficial resources for Hymenoptera in the clearcut area and the adjacent forest stands. To assess the short- and long-term impacts of herbicide application on insect communities, comparisons between stands of various ages and treatments are necessary. Insect traps provide one efficient method for …
Characterization Of Biochelators, Membrane Redox Systems, And Quinone Reductases From Wood Degrading Basidiomycetes, Weihong Qi
Electronic Theses and Dissertations
Biodegradation of wood by brown rot fungi is dependent upon a non-enzymatic system involving Fenton chemistry. Iron biochelators with molecular weights lower than 1kD are important components in this process. Phenolate biochelators drive a hydroxyl radical generating Fenton reaction by reducing ferric iron. Biochelators may be mineralized or alternately, in some cases oxidized biochelators may be regenerated via a quinone redox cycle. Electron donors for this postulated regeneration have not been identified. Extracellular cellobiose dehydrogenase has also been found to drive the Fenton reaction by generating ferrous iron and hydrogen peroxide. This research compared the production of biochelators and the …
Monitoring Dioxin Levels In Maine Rivers With Semipermeable Membrane Devices, Heather A. Shoven
Monitoring Dioxin Levels In Maine Rivers With Semipermeable Membrane Devices, Heather A. Shoven
Electronic Theses and Dissertations
The Maine Department of Environmental Protection (DEP) currently monitors river dioxin levels through the sampling and destructive analysis of fish. Recent state law mandates that by December 31, 2002, the dioxin concentrations in fish downstream of a bleached Kraft pulp and paper mill are not to exceed the concentrations in fish upstream of the mill (38 M.R.S.A. §420-A). The objective of this thesis project was to develop an alternate method for determining Kraft mill compliance to this Dioxin law. This new method that uses semipermeable membrane devices (SPMDs) circumvents many of the concerns generated by the upstream-downstream fish test. An …
Public Conservation Land And Economic Growth In The Northern Forest Region, David Lewis
Public Conservation Land And Economic Growth In The Northern Forest Region, David Lewis
Electronic Theses and Dissertations
Environmental issues frequently revolve around a perceived tradeoff between the economy and the environment. In the Northern Forest region, one of the most important environmental policy issues of recent years has been the ownership of vast stretches of undeveloped forestland. Specifically, the possibility of increasing public conservation ownership on these lands has emerged. Opponents of conservation lands often argue that employment will decline significantly when land is diverted from commodity-oriented uses such as forest products production. Proponents of conservation lands frequently cite the amenity benefits of conservation lands and the potential to diversify and stimulate the economy by designating more …
Tb178: Methods For Evaluating Carbon Fractions In Forest Soils: A Review, Jennifer L. Evans, Ivan J. Fernandez, Lindsey E. Rustad, Stephen A. Norton
Tb178: Methods For Evaluating Carbon Fractions In Forest Soils: A Review, Jennifer L. Evans, Ivan J. Fernandez, Lindsey E. Rustad, Stephen A. Norton
Technical Bulletins
This publication was developed as part of an effort to evaluate the existing methodologies for determining carbon fractions in soils that might be applied to the question of forest soil C sequestration. A great deal of research has been done on this topic although often focused on agronomic soils. Forest land managers will be increasingly interested in identifying methods to monitor and to evaluate the effects of forest practices on soil C reserves. As well researchers are interested in this and the logical linkages to N cycling. Ultimately practical methods that can be widely utilized will be needed; these may …
Certification And Labeling Of Forest Products: Will It Lead To More Environmentally Benign Forestry In Maine?, Mario F. Teisl, Stephanie Peavey, Kelly O’Brien
Certification And Labeling Of Forest Products: Will It Lead To More Environmentally Benign Forestry In Maine?, Mario F. Teisl, Stephanie Peavey, Kelly O’Brien
Maine Policy Review
From a supply and demand point of view, the trend toward forest-products certification appears simple: some retail consumers may prefer to buy products from forests managed in an environmentally sound way while some forest owners may be willing to alter their management practices in order to sell to these consumers. However, as the authors indicate, the issue of communicating to consumers the degree of “environmental good” being purchased can be complicated and may be a factor affecting the long-term success of certification programs. The authors present the results of a recent survey that assessed the use of two types of …
Financial Returns To Northeast Forestland, Julie Rodenberg
Financial Returns To Northeast Forestland, Julie Rodenberg
Electronic Theses and Dissertations
Throughout the past two decades, investors have become increasingly interested in forestland investment. During this time, land has been bought and sold at an increasing pace in the Northeast. Many of the buyers and sellers are interested in timberland exclusively as an investment. This study was divided into two sections. Part one used statewide stumpage data for 17 species-product combinations fiom 1960- 1 999 to explore the impact of property taxes, federal income tax and favorable capital gains treatment on real, after-tax rates of return to forest land in Maine. Property taxes, income taxes, and favorable capital gains taxes were …
Implications Of Longterm Diameter-Limit Harvesting: Effects On Radial Growth Of Red Spruce (Picea Rubens) And Genetic Diversity Of White Pine (Pinus Strobus), Kerry Ann Sokol
Electronic Theses and Dissertations
For over 3 centuries, diameter-limit harvesting has been a predominant logging method in the northeastern United States. Silvicultural theory asserts that such intensively selective harvesting can lead to genetic degradation. A decrease in softwood productivity has recently been reported in Maine - has a long history of dysgenic selection degraded the genetic resources of Maine softwoods, contributing to a decrease in growth and productivity? This study examines two aspects of potential implications of diameter-limit harvesting: effects on residual phenotypes of red spruce and impacts on genetic diversity of white pine. Radial growth of residual red spruce trees in stands experiencing …
Assessing Forest Damage And Tree Response To Ice Storm Injury In Thinned And Unthinned Hardwood Stands In Maine, Julie Lee Swisher
Assessing Forest Damage And Tree Response To Ice Storm Injury In Thinned And Unthinned Hardwood Stands In Maine, Julie Lee Swisher
Electronic Theses and Dissertations
In January 1998, a severe ice storm struck the northeastern United States, causing severe injury to forested areas. Forest damage from ice storms is a result of glaze formation on twigs and branches. Ice storms are recognized as severe disturbances due to their highly destructive nature as a result of ice glaze. Researchers and landowners have been concerned that thinned stands are more susceptible to ice injury than their unthinned counterparts. Thinned stands have fewer trees per area and thus less inter-tree support. In addition, the effects of wind maybe greater in thinned stands. The objectives of this study were …
The Chemical Mechanism Of A Brown-Rot Decay Mimtic System And Its Application In Paper Recycling Processes, Yuhui Qian
The Chemical Mechanism Of A Brown-Rot Decay Mimtic System And Its Application In Paper Recycling Processes, Yuhui Qian
Electronic Theses and Dissertations
This work is aimed at improving our current knowledge of the non-enzymatic inecl~anisins involved in brown-rot decay, as well as the exploration of potential applications of a brown-rot mimetic model system in paper recycling processes. The study was divided into two parts. The first part focussed on the chemical mechanisms involved in chelation and reduction of iron by a low molecular weight chelator (isolated from the brown-rot fungus Gloeophyllz~m tmbeum) and its model compound 2,3- dihydroxybenzoic acid (2,3-DHBA). Chelation as well as free radical generation mediated by this system were studied by ESR measurement. The results indicate that the effects …
Visitor Behaviors And Resource Impacts At Cadillac Mountain, Acadia National Park, Rex Turner
Visitor Behaviors And Resource Impacts At Cadillac Mountain, Acadia National Park, Rex Turner
Electronic Theses and Dissertations
The summit of Cadillac Mountain, located in Maine's Acadia National Park, can be reached via three hiking trails and a scenic auto road. This site attracts over an estimated two million visitors per year. Most of this visitation is concentrated from Memorial Day to Labor Day. The sensitive sub-alpine nature of the site, coupled with high visitation rates, has created a scenario where significant vegetation and soil damage occurs. Additionally, Acadia National Park has experienced chronic problems at this site stemming from visitors altering, destroying, or constructing cairns (pyramid shaped piles of rocks built by trail crews to mark trails …