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Full-Text Articles in Forest Sciences
Quantitative And Qualitative Approaches To Assess Tree Vigor And Stand Health In Dry Pine Forests, Nancy Grulke, Craig Bienz, Kate Hrinkevich, Jason Maxfield, Kellie Uyeda
Quantitative And Qualitative Approaches To Assess Tree Vigor And Stand Health In Dry Pine Forests, Nancy Grulke, Craig Bienz, Kate Hrinkevich, Jason Maxfield, Kellie Uyeda
Biology Faculty Publications and Presentations
Despite a critical need to evaluate effectiveness of forest treatments in improving stand health, practitioners lack quantitative, repeatable metrics to assess tree vigor and stand health. We evaluated canopy and whole tree attributes of ponderosa pine (Pinus ponderosa Dougl. Ex Laws) related to carbon balance, water balance, and susceptibility to insects and pathogens in dry, pine-dominated forest stands during a multi-year drought, an environmental challenge to stand resilience. Metrics of trees in two unmanaged, and seven treated forested stands, in both uplands and lowlands to develop the quantitative approach. Whole tree and crown attributes including needle length and color, branchlet …
Hydrochorous Seed Dispersal In Riparian Forests Altered By Urbanization, Christa Von Behren, J. Alan Yeakley
Hydrochorous Seed Dispersal In Riparian Forests Altered By Urbanization, Christa Von Behren, J. Alan Yeakley
Environmental Science and Management Faculty Publications and Presentations
While riparian habitat alterations from urban stream syndrome are known to affect vegetation establishment and survival, the degree to which riparian seed delivery by hydrochory is affected by urbanization is unclear. We hypothesized that (1) there would be a reduction in the overall number of seeds deposited by streams as watershed urbanization increased; and (2) in the most urbanized watersheds, seeds deposited by water would be predominantly from species with traits favoring dispersal in general, including tall stature and high seed production, and favoring deposition by water in particular, including large seed size and the presence of a dispersal appendage. …
Disturbance Refugia Within Mosaics Of Forest Fire, Drought, And Insect Outbreaks, Meg A. Krawchuk, Garrett W. Meigs, Jennifer M. Cartwright, Jonathan D. Coop, Raymond Davis, Andres Holz, Crystal Kolden, Arjan Jh Meddens
Disturbance Refugia Within Mosaics Of Forest Fire, Drought, And Insect Outbreaks, Meg A. Krawchuk, Garrett W. Meigs, Jennifer M. Cartwright, Jonathan D. Coop, Raymond Davis, Andres Holz, Crystal Kolden, Arjan Jh Meddens
Geography Faculty Publications and Presentations
Disturbance refugia – locations that experience less severe or frequent disturbances than the surrounding landscape – provide a framework to highlight not only where and why these biological legacies persist as adjacent areas change but also the value of those legacies in sustaining biodiversity. Recent studies of disturbance refugia in forest ecosystems have focused primarily on fire, with a growing recognition of important applications to land management. Given the wide range of disturbance processes in forests, developing a broader understanding of disturbance refugia is important for scientists and land managers, particularly in the context of anthropogenic climate change. We illustrate …
Estimating The Present Value Of Carbon Sequestration In U.S. Forests, 2015–2050, For Evaluating Federal Climate Change Mitigation Policies, Robert T. Haight, Randall Bluffstone, Jeffrey D. Kline, John D. Coulston, David N. Wear, Kate Zook
Estimating The Present Value Of Carbon Sequestration In U.S. Forests, 2015–2050, For Evaluating Federal Climate Change Mitigation Policies, Robert T. Haight, Randall Bluffstone, Jeffrey D. Kline, John D. Coulston, David N. Wear, Kate Zook
Economics Faculty Publications and Presentations
We demonstrate an application evaluating carbon sequestration benefits from federal policy alternatives. Using detailed forest inventory data, we projected carbon sequestration outcomes in the coterminous 48 states for a baseline scenario and three policy scenarios through 2050. Alternatives included (1) reducing deforestation from development, (2) afforestation in the eastern United States and reforestation in the western United States, and (3) reducing stand-replacing wildfires. We used social cost of carbon estimates to evaluate the present value of carbon sequestration benefits gained with each policy. Results suggest that afforestation and reforestation would provide the greatest marginal increase in carbon benefit, far exceeding …
The Influence Of Market Proximity On National Forest Hazardous Fuels Treatments, Max Nielsen-Pincus, Susan Charnley, Cassandra Moseley
The Influence Of Market Proximity On National Forest Hazardous Fuels Treatments, Max Nielsen-Pincus, Susan Charnley, Cassandra Moseley
Environmental Science and Management Faculty Publications and Presentations
The US Department of Agriculture Forest Service's focus on hazardous fuels reduction has increased since the adoption of the National Fire Plan in 2001. However, appropriations for hazardous fuels reduction still lag behind wildfire suppression spending. Offsetting fuels treatment costs through biomass utilization or by using innovative administrative mechanisms such as stewardship contracting are two approaches to stretching appropriated dollars further across the landscape. We use fuels treatment data (n = 8,451 locations) to ask how wood- processing infrastructure influences where and how much hazardous fuels treatments, biomass utilization, and stewardship contracting occur on national forests in Oregon and Washington. …
Street Trees In The Urban Forest Canopy: Portland, Oregon, Joseph Poracsky, David Banis
Street Trees In The Urban Forest Canopy: Portland, Oregon, Joseph Poracsky, David Banis
Geography Faculty Publications and Presentations
Attempts to identify the contribution of street trees to the overall urban forest of a city have been rare and lack consensus on how to measure that contribution – percentage of trees, percentage of canopy cover, or percentage of leaf area. The actual numeric values presented in the literature also vary over a broad range and often are based on estimates, extrapolations from aggregated data, or simply stated with no empirical data referenced. This study was undertaken to evaluate the contribution of street trees to canopy in Portland, Oregon. The study involved both visual and digital analysis of multi-band aerial …