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- Air quality -- Measurement (1)
- Aquatic ecology -- Research -- United States (1)
- Automobiles -- Motors -- Exhaust gas -- Measurement (1)
- Biodiesel fuels -- Environmental aspects (1)
- Butterflies -- Conservation -- Oregon -- Pacific Coast (1)
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- Diesel motor exhaust gas -- Health aspects (1)
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- Oregon silverspot butterfly -- Mortality -- Oregon (1)
- Plant-soil relationships (1)
- Restoration monitoring (Ecology) -- Oregon -- Grant County (1)
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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
An Investigation Of Urban Mobile Source Aerosol Using Optical Properties Measured By Crdt/N: Diesel Particulate Matter And The Impact Of Biodiesel, Monica Elizabeth Wright
An Investigation Of Urban Mobile Source Aerosol Using Optical Properties Measured By Crdt/N: Diesel Particulate Matter And The Impact Of Biodiesel, Monica Elizabeth Wright
Dissertations and Theses
Mobile source emissions are a major contributor to global and local air pollution. Governments and regulatory agencies have been increasing the stringency of regulations in the transportation sector for the last ten years to help curb transportation sector air pollution. The need for regulations has been emphasized by scientific research on the impacts from ambient pollution, especially research on the effect of particulate matter on human health. The particulate emissions from diesel vehicles, diesel particulate matter (DPM) is considered a known or probable carcinogen in various countries and increased exposure to DPM is linked to increased cardiovascular health problems in …
Divergent Carbon Dynamics Under Climate Change In Forests With Diverse Soils, Tree Species, And Land Use Histories, Robert M. Scheller, Alec M. Kretchun, Steve Van Tuyl, Kenneth L. Clark, Melissa S. Lucash, John Hom
Divergent Carbon Dynamics Under Climate Change In Forests With Diverse Soils, Tree Species, And Land Use Histories, Robert M. Scheller, Alec M. Kretchun, Steve Van Tuyl, Kenneth L. Clark, Melissa S. Lucash, John Hom
Environmental Science and Management Faculty Publications and Presentations
Accounting for both climate change and natural disturbances—which typically result in greenhouse gas emissions—is necessary to begin managing forest carbon sequestration. Gaining a complete understanding of forest carbon dynamics is, however, challenging in systems characterized by historic over-utilization, diverse soils and tree species, and frequent disturbance. In order to elucidate the cascading effects of potential climate change on such systems, we projected forest carbon dynamics, including soil carbon changes, and shifts in tree species composition as a consequence of wildfires and climate change in the New Jersey pine barrens (NJPB) over the next 100 years. To do so, we used …
Connecting Habitat Across Roads: Field Testing Mitigation Strategies For Reducing Road Mortality Of An Imperiled Butterfly, Rebecca Jalene Littlejohn
Connecting Habitat Across Roads: Field Testing Mitigation Strategies For Reducing Road Mortality Of An Imperiled Butterfly, Rebecca Jalene Littlejohn
Environmental Science and Management Professional Master's Project Reports
Roads impact wildlife in a variety of ways including fragmentation of populations, reduced access to habitat, and direct mortality from vehicle strikes. Such road effects likely impact the Oregon silverspot butterfly (Speyeria zerene hippolyta) at one of its few remaining sites. The Rock Creek-Big Creek population of this threatened fritillary butterfly species is bisected by highway 101 on the central Oregon coast. Habitat resources for S. z. hippolyta are found on both the east and west sides of the highway at this site, and vehicle-strikes have been found to cause mortality of some individuals crossing the highway. The …
Using Environmental Variables And Soil Processes To Forecast Denitrification Potential And Nitrous Oxide Fluxes In Coastal Plain Wetlands Across Different Land Uses, Jennifer L. Morse, Marcelo Ardón, Emily S. Bernhardt
Using Environmental Variables And Soil Processes To Forecast Denitrification Potential And Nitrous Oxide Fluxes In Coastal Plain Wetlands Across Different Land Uses, Jennifer L. Morse, Marcelo Ardón, Emily S. Bernhardt
Environmental Science and Management Faculty Publications and Presentations
We examined relationships between denitrification (DNF) and nitrous oxide (N2O) fluxes and potentially important chemical and physical predictors to build a predictive understanding of gaseous N losses from coastal plain wetlands. We collected soil, gas, and pore water samples from 48 sampling locations across a large (440 ha) restored wetland, an adjacent drained agricultural field, and nearby forested wetlands every two months over two years. In summer and fall 2007, we measured soil DNF potential (21.6-3560 mg N m-3 d-1) and N2O efflux (-4.36-8.81 mg N m -2 d-1), along with 17 predictor variables. We developed statistical models for the …
An Individual-Based Process Model To Simulate Landscape-Scale Forest Ecosystem Dynamics, Rupert Seidi, Werner Rammer, Robert M. Scheller, Thomas A. Spies
An Individual-Based Process Model To Simulate Landscape-Scale Forest Ecosystem Dynamics, Rupert Seidi, Werner Rammer, Robert M. Scheller, Thomas A. Spies
Environmental Science and Management Faculty Publications and Presentations
Forest ecosystem dynamics emerges from nonlinear interactions between adaptive biotic agents (i.e., individual trees) and their relationship with a spatially and temporally heterogeneous abiotic environment. Understanding and predicting the dynamics resulting from these complex interactions is crucial for the sustainable stewardship of ecosystems, particularly in the context of rapidly changing environmental conditions. Here we present iLand (the individual-based forest landscape and disturbance model), a novel approach to simulating forest dynamics as an emergent property of environmental drivers, ecosystem processes and dynamic interactions across scales. Our specific objectives were (i) to describe the model, in particular its novel approach to simulate …
The Role Of Habitat Restoration And Conservation In The Changing Socio-Economic Conditions Of Grant County, Oregon, Kristen Lauren Senkyr
The Role Of Habitat Restoration And Conservation In The Changing Socio-Economic Conditions Of Grant County, Oregon, Kristen Lauren Senkyr
Dissertations and Theses
Habitat restoration has socio-economic as well as biophysical impacts. In Grant County, Oregon a recent influx of funding and technical resources for habitat restoration has led to focused monitoring efforts there to better understand the impacts. This study explores how local land use and land management practices are changing in Grant County as a result of restoration and other drivers. In-depth interviews were conducted with 17 landowners, land managers, and long time residents to document the change they have observed and identify how they are adapting. The results suggest that many interconnected social, economic, and ecological changes have taken place …
Survey Of Aquatic Invasive Species In Selected Umpqua National Forest Lakes And Ponds, Mark D. Sytsma, Rich Miller
Survey Of Aquatic Invasive Species In Selected Umpqua National Forest Lakes And Ponds, Mark D. Sytsma, Rich Miller
Center for Lakes and Reservoirs Publications and Presentations
Eleven lakes and ponds within the Umpqua National Forest were surveyed for invasive aquatic macrophytes, snails, bivalves, and crayfish during the summer of 2011. Yellow floating heart (Nymphoides peltata), an invasive floating leaf macrophyte species, was detected in Willow Sump within the Little River drainage. European ear snails (Radix auricularia), an invasive species present in several Umpqua National Forest waterbodies, were detected in Beaver Pond within the Steamboat Creek drainage. One native crayfish species, the signal crayfish (Pacifastacus leniusculus), was observed in Crayfish Lake within the Brice Creek drainage. Diverse assemblages of native plant species were observed in the lakes …
A New Model For Simulating Climate Change And Carbon Dynamics In Forested Landscapes, Caren C. Dymond, Robert M. Scheller, Sarah Beukema
A New Model For Simulating Climate Change And Carbon Dynamics In Forested Landscapes, Caren C. Dymond, Robert M. Scheller, Sarah Beukema
Environmental Science and Management Faculty Publications and Presentations
Journal of Ecosystems & Management vol. 13 no. 2 2012 news brief .
Greenhouse Gas Fluxes In Southeastern U.S. Coastal Plain Wetlands Under Contrasting Land Uses, Jennifer L. Morse, Marcelo Ardón, Emily S. Bernhardt
Greenhouse Gas Fluxes In Southeastern U.S. Coastal Plain Wetlands Under Contrasting Land Uses, Jennifer L. Morse, Marcelo Ardón, Emily S. Bernhardt
Environmental Science and Management Faculty Publications and Presentations
Whether through sea level rise or wetland restoration, agricultural soils in coastal areas will be inundated at increasing rates, renewing connections to sensitive surface waters and raising critical questions about environmental trade-offs. Wetland restoration is often implemented in agricultural catchments to improve water quality through nutrient removal. Yet flooding of soils can also increase production of the greenhouse gases nitrous oxide and methane, representing a potential environmental trade-off. Our study aimed to quantify and compare greenhouse gas emissions from unmanaged and restored forested wetlands, as well as actively managed agricultural fields within the North Carolina coastal plain, USA. In sampling …