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Articles 151 - 168 of 168
Full-Text Articles in Life Sciences
Flep: Forest Land Enhancement Program
Flep: Forest Land Enhancement Program
Nebraska Forest Service: Publications
What is FLEP?;Cost-share Assistance;Eligibility;Participation Procedure;FLEP Practices;NFS Foresters
Forest Certification As Environmental Law Making By Global Civil Society, Errol E. Meidinger
Forest Certification As Environmental Law Making By Global Civil Society, Errol E. Meidinger
Contributions to Books
Published in Social and Political Dimensions of Forest Certification, Errol Meidinger, Christopher Elliott & Gerhard Oesten, eds.
Effect Of Thermal Screens On The Microclimate And Overall Heat Loss Coefficient In Plastic Tunnel Greenhouses, H. Hüseyi̇n Öztürk, Ali̇ Başçeti̇nçeli̇k
Effect Of Thermal Screens On The Microclimate And Overall Heat Loss Coefficient In Plastic Tunnel Greenhouses, H. Hüseyi̇n Öztürk, Ali̇ Başçeti̇nçeli̇k
Turkish Journal of Agriculture and Forestry
The objective of the present study was to evaluate the effects of thermal screens made of clear polyethylene (PE) and polyester material on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. The dimensions of the plastic tunnels were: width 6 m, length 20 m and height 3 m. Three different installations were used: (1) a single cover without a screen (as a control); (2) a single cover with a PE screen; and (3) a single cover with a polyester screen. The thermal screens made of PE with UV+IR additives and polyester materials were placed at a height …
Effect Of Cadmium On Growth And Concentrations Of Cadmium, Ascorbic Acid And Sulphydryl Groups In Durum Wheat Cultivars, Levent Öztürk, Seli̇m Eker, Faruk Özkutlu, İsmai̇l Çakmak
Effect Of Cadmium On Growth And Concentrations Of Cadmium, Ascorbic Acid And Sulphydryl Groups In Durum Wheat Cultivars, Levent Öztürk, Seli̇m Eker, Faruk Özkutlu, İsmai̇l Çakmak
Turkish Journal of Agriculture and Forestry
By using two durum wheat cultivars (Triticum durum L. cvs. Balcali-85 and C-1252) a nutrient solution experiment was carried out to study i) genotypic variation in cadmium (Cd) tolerance, ii) Cd concentrations in plants, and iii) the role of ascorbic acid and non-protein SH groups (SH: sulphydryl) in Cd tolerance. Plants were grown under controlled climatic conditions for 15 days and subjected to increasing Cd supply (0, 6, 30, 75 and 150 µM). Of the two cultivars, C-1252 showed greater sensitivity to Cd toxicity as judged from the severity of Cd toxicity symptoms on leaves. Increasing Cd supply markedly reduced …
Aspen Management Guidelines For Blm Lands In North-Central Nevada, Charles E. Kay
Aspen Management Guidelines For Blm Lands In North-Central Nevada, Charles E. Kay
Aspen Bibliography
No abstract provided.
Long Term Permanent Vegetation Plot Studies In The Matoaka Woods, Williamsburg, Virginia : Establishment And Initial Data Analysis Of Plots Established With The North Carolina Vegetation Survey Protocol, Resampling Of Single Circular Plots And A Comparison Of Results From North Carolina Vegetation Survey Protocol And Single Circular Plot Methods, Jacob Robert George Kribel
Dissertations, Theses, and Masters Projects
No abstract provided.
An Exploratory Look At An Evolving Tourism Industry: Maine's Nature-Based Tourism Industry In Transition, Marc Edwards
An Exploratory Look At An Evolving Tourism Industry: Maine's Nature-Based Tourism Industry In Transition, Marc Edwards
Electronic Theses and Dissertations
Maine's natural resources have been attracting visitors to the State for more than 150 years, from artists drawn to the beauty and wildness of the coast, such as Thomas Cole in 1844, to Henry David Thoreau's well-documented trip to Katahdin popularized in his collection of essays The Maine Woods. Early artists like Cole lodged with local farmers and Thoreau's journeys into the Maine woods were aided by Native American and local guides. These early artists and adventurers could be said to be among the first nature-based tourists in Maine, while those who provided lodging and guide services were among the …
Effects Of Strand Geometry On Selected Properties Of Long-Stand Structural Composite Lumber Made From Northeastern Hardwoods, Russell Edgar
Effects Of Strand Geometry On Selected Properties Of Long-Stand Structural Composite Lumber Made From Northeastern Hardwoods, Russell Edgar
Electronic Theses and Dissertations
Structural composite lumber (SCL) products often possess significantly higher design values than the top grades of solid lumber, making it a popular choice for both residential and commercial applications. The enhanced mechanical properties of SCL are mainly due to defect randomization and densification of the wood fiber, both largely functions of the size, shape and composition (species) of the wood element. Traditionally, SCL manufacturers have used thin, rectangular elements produced from either moderate density softwoods or low density hardwoods. Higher density hardwood species have been avoided, as they require higher pressures to adequately densify and consolidate the wood furnish. These …
Ten Years Of Change In Beech Stand In North Central Maine Long Affected With Beech Bark Disease, Amanda Farrar
Ten Years Of Change In Beech Stand In North Central Maine Long Affected With Beech Bark Disease, Amanda Farrar
Electronic Theses and Dissertations
In Maine, northern hardwood stands long affected by beech bark disease often still have high numbers of beech trees. This is mostly due to sprouting, and most new stems become severely infected with the disease. Beech that are resistant to the scale insect, Cryptococcus fagisuga Lind., the inciting factor for the disease complex, do exist and often occur in clumps of root sprout origin. In 1989 a long-term study of the effects of commonly used seasonal harvesting regimes on regeneration initiation and survival was established in north central Maine. Treatments included harvest season (winter or summer) and intensity (clearcut or …
Vegetation Dynamics And Tree Radial Growth Response In Harvest Gaps, Natural Gaps, And Closed Canopy Conditions In Maine's Acadian Forest, Darci A. Schofield
Vegetation Dynamics And Tree Radial Growth Response In Harvest Gaps, Natural Gaps, And Closed Canopy Conditions In Maine's Acadian Forest, Darci A. Schofield
Electronic Theses and Dissertations
The creation of natural canopy gaps is an important ecological process in the Acadian forest. Designing harvest gaps that emulate natural gap dynamics may be important for maintaining structural and biological diversity, as well as naturally regenerating desired tree species. We used a controlled study to 1) compare vegetation dynamics among and within harvested gaps, natural gaps, and under a closed canopy, and 2) examine the growth response of mature overstory edge trees of harvests gap and saplings inside of gaps as possible methods for dating natural gaps in the Acadian forest. For the vegetation dynamics study (objective I), we …
A Semi-Empirical Cellular Automata Model For Wildfire Monitoring From A Geosynchronous Space Platform, Brian D. Killough
A Semi-Empirical Cellular Automata Model For Wildfire Monitoring From A Geosynchronous Space Platform, Brian D. Killough
Dissertations, Theses, and Masters Projects
The environmental and human impacts of wildfires have grown considerably in recent years due to an increase in their frequency and coverage. Effective wildfire management and suppression requires real-time data to locate fire fronts, model their propagation and assess the impact of biomass burning. Existing empirical wildfire models are based on fuel properties and meteorological data with inadequate spatial or temporal sampling. A geosynchronous space platform with the proposed set of high resolution infrared detectors provides a unique capability to monitor fires at improved spatial and temporal resolutions. The proposed system is feasible with state-of-the-art hardware and software for high …
Quantifying Forest Ground Flora Biomass Using Proximal Sensing, Paul F. Doruska, Robert C. Weih Jr., Matthew D. Lane, Don C. Bragg
Quantifying Forest Ground Flora Biomass Using Proximal Sensing, Paul F. Doruska, Robert C. Weih Jr., Matthew D. Lane, Don C. Bragg
Journal of the Arkansas Academy of Science
Current focus on forest conservation and forest sustainability has increased the level of attention given to measures of ground flora in forest ecosystems. Traditionally, such data are collected via time- and resource-intensive methods of field identification, clipping, and weighing. With increased focus on community composition and structure measures of forest ground flora, the manner in which these data are collected must change. This project uses color and color infrared digital cameras to proximally sense forest ground flora and to develop regression models to predict green and dry biomass (g/m^) from the proximally sensed data. Traditional vegetative indices such as the …
Models For The Distribution Of Quaking Aspen In Geographic And Potential Evapotranspiration Spaces Relevant To The Book Cliffs (Utah), 2000-2002, Joseph O. Sexton
Models For The Distribution Of Quaking Aspen In Geographic And Potential Evapotranspiration Spaces Relevant To The Book Cliffs (Utah), 2000-2002, Joseph O. Sexton
Aspen Bibliography
Quaking aspen is the most widely distributed tree species in North America and an asset to sociological, ecological, and hydrological land values in the western United States. In recognition of these values, land managers seek means to oppose a regional decline of aspen in the Intermountain West—a decline apparently in progress since the close of the Pleistocene and driven by climate change, fire suppression, and increasing ungulate densities. One location of special relevance to this decline is the Utah-Colorado Book Cliffs, a discrete boundary of quaking aspen’s geographic range and a potential biogeographic corridor between the sub-alpine communities of the …
Dark Wilderness A Phenomenological Exploration Of The Idea Of Cave Wilderness, Patricia E. Seiser
Dark Wilderness A Phenomenological Exploration Of The Idea Of Cave Wilderness, Patricia E. Seiser
Graduate Theses, Dissertations, and Problem Reports
It has been almost forty years since the passage of the 1964 Wilderness Act and the establishment of the National Wilderness Preservation System. Forty years later, we still have not seen a wilderness that is not a surface environment. There exist neither subterranean nor marine wilderness areas. Efforts on behalf of cave wilderness have focused on the 1964 Wilderness Act legal definition of wilderness. Perhaps what is required is a different concept for the establishment of cave wilderness. This study explored the idea of cave wilderness from a human dimension perspective, via focus groups, using stakeholders from two cave regions …
Forest Certification As A Global Civil Society Regulatory Institution, Errol E. Meidinger
Forest Certification As A Global Civil Society Regulatory Institution, Errol E. Meidinger
Contributions to Books
Published in Social and Political Dimensions of Forest Certification, Errol Meidinger, Christopher Elliott & Gerhard Oesten, eds.
The Economic Value Of Tourism And Recreation In Forested Areas Of Western Australia, Rachel Goff
The Economic Value Of Tourism And Recreation In Forested Areas Of Western Australia, Rachel Goff
Theses: Doctorates and Masters
In recent years, natural area tourism has been presented as a more profitable, labour intensive and environmentally sound industry than the traditional extractive industries which have resulted in the depletion of primary resources in many countries (Burr, 1995). However, in order for economic returns from tourism to be maintained over a long period of time, investment in resources and infrastructure that support and encourage sustainable tourism and recreation activity in natural areas is required. The key to sustainability is maintaining the capital stock of resources (Garrod & Fyall, 1998; Russell, 2001). In a society driven by economics, resources are allocated …
Aspen Delineation Project 2003 Summary Report, David Burton
Aspen Delineation Project 2003 Summary Report, David Burton
Aspen Bibliography
The 2003 report summarizes the second year of the Aspen Delineation Project (ADP) as a project cosponsored by the Forest Service, Pacific Southwest Region; California State Office, Bureau of Land Management; and California Department of Fish and Game. David Burton, the Principal Investigator of the Aspen Delineation Project, works under the direction of Hugh Safford (FS), Ed Lorentzen (BLM), and Eric Loft (CDFG).
Good Intentions May Doom Aspen Groves, James R. Fazio
Good Intentions May Doom Aspen Groves, James R. Fazio
Aspen Bibliography
If there were a Guiness Book of World Records for trees, quaking aspen would be in it - not once but probably several times.