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Articles 1 - 10 of 10
Full-Text Articles in Physical Sciences and Mathematics
Estimating Soil Seed Bank Characteristics In Ponderosa Pine Forests Using Vegetation And Forest-Floor Data, Scott R. Abella, Judith D. Springer
Estimating Soil Seed Bank Characteristics In Ponderosa Pine Forests Using Vegetation And Forest-Floor Data, Scott R. Abella, Judith D. Springer
Public Policy and Leadership Faculty Publications
Soil seed banks are important for vegetation management because they contain propagules of species that may be considered desirable or undesirable for site colonization after management and disturbance events. Knowledge of seed bank size and composition before planning management activities facilitates proactive management by providing early alerts of exotic species presence and of abilities of seed banks to promote colonization by desirable species. We developed models in ponderosa pine (Pinus ponderosa) forests in northern Arizona to estimate the size and richness of mineral soil seed banks using readily observable vegetation and forestfloor characteristics. Regression models using three or fewer predictors …
Changes In Gambel Oak Densities In Southwestern Ponderosa Pine Forests Since Euro-American Settlement, Scott R. Abella, Peter Z. Fule
Changes In Gambel Oak Densities In Southwestern Ponderosa Pine Forests Since Euro-American Settlement, Scott R. Abella, Peter Z. Fule
Public Policy and Leadership Faculty Publications
Densities of small-diameter ponderosa pine (Pinus ponderosa) trees have increased in southwestern ponderosa pine forests during a period of fire exclusion since Euro-American settlement in the late 1800s. However, less well known are potential changes in Gambel oak (Quercus gambelii) densities during this period in these forests. We reviewed published literature to summarize changes in oak density in ponderosa pine forests over the past 140 years and evaluated the possibility that large-diameter oaks have decreased in density. All nine studies examining oak density changes found that densities of small-diameter oaks have escalated. Increases ranged from 4- to more than 63-fold. …
Plant Recruitment In A Northern Arizona Ponderosa Pine Forest: Testing Seed- And Leaf Litter- Limitation Hypotheses, Scott R. Abella
Plant Recruitment In A Northern Arizona Ponderosa Pine Forest: Testing Seed- And Leaf Litter- Limitation Hypotheses, Scott R. Abella
Public Policy and Leadership Faculty Publications
Seed availability and leaf litter limit plant establishment in some ecosystems. To evaluate the hypothesis that these factors limit understory plant recruitment in Pinus ponderosa forests, I conducted a seeding and litter removal experiment at six thinned sites in the Fort Valley Experimental Forest, northern Arizona. Experimental seeding of four native species (Penstemon virgatus, Erigeron formosissimus, Elymus elymoides, and Festuca arizonica) and raking of litter occurred in 2005. Seeding resulted in a substantial recruitment of 14 to 103 seedlings/m2 (1 to 10/ft2) one month after seeding for two species (P. virgatus and E. elymoides), but these densities subsequently declined by …
Slides: Adapting Western Water Policy For Resilience Under Climate Change, Bonnie G. Colby
Slides: Adapting Western Water Policy For Resilience Under Climate Change, Bonnie G. Colby
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
Presenter: Dr. Bonnie G. Colby, Professor of Resource Economics & Hydrology, University of Arizona Department of Agriculture & Resource Economics
22 slides
Slides: Linking Growth, Land Use And Water, Jim Holway
Slides: Linking Growth, Land Use And Water, Jim Holway
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
Presenter: Jim Holway, Global Institute of Sustainability, Civil and Environmental Engineering, Arizona Water Institute, Arizona State University
29 slides
Slides: The Urbanizing West: Limits To Water, Limits To Growth, Lora A. Lucero
Slides: The Urbanizing West: Limits To Water, Limits To Growth, Lora A. Lucero
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
Presenter: Lora A. Lucero, AICP, American Planning Association
18 slides
Slides: Water Needs And Strategies For A Sustainable Future, Shaun Mcgrath
Slides: Water Needs And Strategies For A Sustainable Future, Shaun Mcgrath
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
Presenter: Shaun McGrath, Program Director, Western Governors’ Association
25 slides
Slides: Threats To Biological Diversity: Global, Continental, Local, J. Michael Scott
Slides: Threats To Biological Diversity: Global, Continental, Local, J. Michael Scott
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
Presenter: J. Michael Scott, U.S. Geological Survey, Idaho Cooperative Fish and Wildlife Research Unit, University of Idaho
38 slides
Bridging The Governance Gap: Strategies To Integrate Water And Land Use Planning, Sarah Bates Van De Wetering, University Of Montana (Missoula). Public Policy Research Institute
Bridging The Governance Gap: Strategies To Integrate Water And Land Use Planning, Sarah Bates Van De Wetering, University Of Montana (Missoula). Public Policy Research Institute
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
16 pages.
Includes bibliographical references
"2007"
"Collaborative Governance Report 2"
Slides: Fuel Choice Determines Transmission, Doug Larson
Slides: Fuel Choice Determines Transmission, Doug Larson
Shifting Baselines and New Meridians: Water, Resources, Landscapes, and the Transformation of the American West (Summer Conference, June 4-6)
Presenter: Doug Larson, Western Interstate Energy Board
26 slides