Index Catalog // ScholarsArchive@OSU

United States Forest Disturbance Trends Observed Using Landsat Time Series

Creator:: Masek, Jeffrey G., Goward, Samuel N., Kennedy, Robert E., Cohen, Warren B., Moisen, Gretchen G., Schleeweis, Karen, and Huang, Chengquan
Abstract:: Disturbance events strongly affect the composition, structure, and function of forest ecosystems; however, existing US land management inventories were not designed to monitor disturbance. To begin addressing this gap, the North American Forest Dynamics (NAFD) project has examined a geographic sample of 50 Landsat satellite image time series to assess...
Resource Type:: Article
Full Text:: Using Landsat Time Series Jeffrey G. Masek,1* Samuel N. Goward,2 Robert E. Kennedy,3,4 Warren B. Cohen

Regional dynamics of forest canopy change and underlying causal processes in the contiguous U.S.

Creator:: Schleeweis, Karen, Goward, Samuel N., Huang, Chengquan, Masek, Jeffrey G., Moisen, Gretchen, Kennedy, Robert E., and Thomas, Nancy E.
Abstract:: The history of forest change processes is written into forest age and distribution and affects earth systems at many scales. No one data set has been able to capture the full forest disturbance and land use record through time, so in this study, we combined multiple lines of evidence to...
Resource Type:: Article
Full Text:: change and underlying causal processes in the contiguous U.S. Karen Schleeweis,1,2 Samuel N. Goward,2

Forest-floor Disturbance Reduces Chipmunk (Tamias spp.) Abundance Two Years after Variable-retention Harvest of Pacific Northwestern Forests

Creator:: Wilk, Randall J., Harrington, Timothy B., Gitzen, Robert A., and Maguire, Chris C.
Abstract:: We evaluated the two-year effects of variable-retention harvest on chipmunk (Tamias spp.) abundance (Nˆ ) and habitat in mature coniferous forests in western Oregon and Washington because wildlife responses to density/pattern of retained trees remain largely unknown. In a randomized complete-block design, six treatments were applied to 13-ha units at...
Resource Type:: Article
Full Text:: Sciences Laboratory, 3625 93rd Avenue SW, Olympia, Washington 98512 Robert A. Gitzen2 , School of

Wolves and the Ecology of Fear: Can Predation Risk Structure Ecosystems?

Creator:: Ripple, William J. and Beschta, Robert L.
Abstract:: We investigated how large carnivores, herbivores, and plants may be linked to the maintenance of native species biodiversity through trophic cascades. The extirpation of wolves (Canis lupus) from Yellowstone National Park in the mid-1920s and their reintroduction in 1995 provided the opportunity to examine the cascading effects of carnivore–herbivore interactions...
Resource Type:: Article
Full Text:: Ecology of Fear: Can Predation Risk Structure Ecosystems? Author(s): WILLIAM J. RIPPLE and ROBERT L

Comparison and assessment of coarse resolution land cover maps for Northern Eurasia

Creator:: Pflugmacher, Dirk, Krankina, Olga N., Cohen, Warren B., Friedl, Mark A., Sulla-Menashe, Damien, Kennedy, Robert E., Nelson, Peder, Loboda, Tatiana V., Kuemmerle, Tobias, Dyukarev, Egor, Elsakov, Vladimir, and Kharuk, Viacheslav I.
Abstract:: Information on land cover at global and continental scales is critical for addressing a range of ecological, socioeconomic and policy questions. Global land cover maps have evolved rapidly in the last decade, but efforts to evaluate map uncertainties have been limited, especially in remote areas like Northern Eurasia. Northern Eurasia...
Resource Type:: Article
Full Text:: and assessment of coarse resolution land cover maps for Northern Eurasia Dirk Pflugmacher a,⁎, Olga N

An individual-based process model to simulate landscape-scale forest ecosystem dynamics

Creator:: Seidl, Rupert, Rammer, Werner, Scheller, Robert M., and Spies, Thomas A.
Abstract:: 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...
Resource Type:: Article
Full Text:: ScienceDirect Ecological Modelling jo ur n al homep ag e: www.elsev ier .com/ locate /eco lmodel n

Deploying initial attack resources for wildfire suppression: spatial coordination, budget constraints, and capacity constraints

Creator:: Lee, Yohan, Fried, Jeremy S., Albers, Heidi J., and Haight, Robert G.
Abstract:: We combine a scenario-based, standard-response optimization model with stochastic simulation to improve the efficiency of resource deployment for initial attack on wildland fires in three planning units in California. The optimization model minimizes the expected number of fires that do not receive a standard response-defined as the number of resources...
Resource Type:: Article
Full Text:: constraints Yohan Lee, Jeremy S. Fried, Heidi J. Albers, and Robert G. Haight Abstract:We combine a scenario

A Landsat time series approach to characterize bark beetle and defoliator impacts on tree mortality and surface fuels in conifer forests

Creator:: Meigs, Garrett W., Kennedy, Robert E., and Cohen, Warren B.
Abstract:: Insects are important forest disturbance agents, and mapping their effects on tree mortality and surface fuels represents a critical research challenge. Although various remote sensing approaches have been developed to monitor insect impacts, most studies have focused on single insect agents or single locations and have not related observed changes...
Resource Type:: Article
Full Text:: ,⁎, Robert E. Kennedy a, Warren B. Cohen b a Department of Forest Ecosystems and Society, Oregon State

Interactive visual analysis promotes exploration of long-term ecological data

Creator:: Pham, Tuan, Jones, Julia A., Metoyer, Ronald, Swanson, Frederick, and Pabst, Robert
Abstract:: Long-term ecological data are crucial in helping ecologists understand ecosystem function and environmental change. Nevertheless, these kinds of data sets are difficult to analyze because they are usually large, multivariate, and spatiotemporal. Although existing analysis tools such as statistical methods and spreadsheet software permit rigorous tests of pre-conceived hypotheses and...
Resource Type:: Article
Full Text:: ecological data TUAN PHAM,1,� JULIA JONES,2 RONALD METOYER,1 FREDERICK SWANSON,3 AND ROBERT PABST4 1School

Calculating CO2 and H2O eddy covariance fluxes from an enclosed gas analyzer using an instantaneous mixing ratio

Creator:: Burba, George, Schmidt, Andres, Scott, Russell L., Nakai, Taro, Kathilankal, James, Fratini, Gerardo, Hanson, Chad, Law, Beverly, McDermitt, Dayle K., Eckles, Robert, Furtaw, Michael, and Velgersdyk, Michael
Abstract:: Eddy covariance flux research has relied on open- or closed-path gas analyzers for producing estimates of net ecosystem exchange of carbon dioxide (CO₂) and water vapor (H₂O). The two instruments have had different challenges that have led to development of an enclosed design that is intended to maximize strengths and...
Resource Type:: Article
Full Text:: * , CHAD HANSON † , B EVERLY LAW † , DAYLE K . MCDERMITT * , ROBERT ECKLES * , M ICHAEL FURTAW* and

ScholarsArchive@OSU

United States Forest Disturbance Trends Observed Using Landsat Time Series

Regional dynamics of forest canopy change and underlying causal processes in the contiguous U.S.

Forest-floor Disturbance Reduces Chipmunk (Tamias spp.) Abundance Two Years after Variable-retention Harvest of Pacific Northwestern Forests

Wolves and the Ecology of Fear: Can Predation Risk Structure Ecosystems?

Comparison and assessment of coarse resolution land cover maps for Northern Eurasia

An individual-based process model to simulate landscape-scale forest ecosystem dynamics

Deploying initial attack resources for wildfire suppression: spatial coordination, budget constraints, and capacity constraints

A Landsat time series approach to characterize bark beetle and defoliator impacts on tree mortality and surface fuels in conifer forests

Interactive visual analysis promotes exploration of long-term ecological data

Calculating CO2 and H2O eddy covariance fluxes from an enclosed gas analyzer using an instantaneous mixing ratio

Limit your search

Academic Affiliation

Creator

Date

Decade

File Format

Language

License

Peer Reviewed

Resource Type

Rights Statement

Search Constraints

Search Results

Limit your search