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Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
Distribution Patterns Of Great Basin Conifers: Implications Of Extinction And Immigration, David A. Charlet
Distribution Patterns Of Great Basin Conifers: Implications Of Extinction And Immigration, David A. Charlet
Aliso: A Journal of Systematic and Floristic Botany
Factors influencing the distribution of scattered montane conifers on mountaintops in the Great Basin of North America were investigated. The sources of data were collections and observations on more than 300 mountain ranges in the region. All mountains in the region with at least one montane conifer species and all adjacent source areas were included in the data set. In all, 164 montane island sites and 40 mainland sites were used in the analyses. Physical data for each site were compiled and regression analyses were conducted to test the predictions of three island biogeography models: immigration, extinction, and equilibrium. These …
Substrate Availability And Regeneration Microsites Of Tolerant Conifers In Mixed-Species Stands In Maine, Jamie K. Weaver
Substrate Availability And Regeneration Microsites Of Tolerant Conifers In Mixed-Species Stands In Maine, Jamie K. Weaver
Electronic Theses and Dissertations
This study investigates regeneration in mixed-species stands in the Acadian Forest of Maine. We examined the effect of silvicultural intensity on available regeneration substrates and how seedling-substrate relationships may be impacted by management activities. Silvicultural treatments studied include two replicates each of 5-year selection, 20-year selection, commercial clearcutting (unregulated harvesting), and three replicates of no management (defined as no harvesting for at least 50 years). We focused on red spruce (Picea rubens Sarg.), eastern hemlock (Tsuga canadensis (L.) Carr.), balsam fir (Abies balsamea L. Mill), and red maple (Acer rubrum L.); all four species are common within the Acadian region. …
Early Life Stage Characteristics Of Six Acadian Conifer Species: Germination And Seedling Development In A Changing Climate, Jason D. Schatz
Early Life Stage Characteristics Of Six Acadian Conifer Species: Germination And Seedling Development In A Changing Climate, Jason D. Schatz
Electronic Theses and Dissertations
Global climate change will drastically alter regional climates. The influence of these changes on the distribution and relative abundance of forest trees is both critically important and subject to substantial uncertainty. It will be particularly important to understand the effects of different climate scenarios on the early life stages of major tree species, because: 1) Early life stage performance and survival strongly influence the abundance of mature trees of a given species, 2) Trees are most sensitive to environmental variation during their early life stages, and 3) Our knowledge of the response of Acadian Forest tree species to environmental variation …
Past, Present, And Future Old Growth In Frequent-Fire Conifer Forests Of The Western United States, Scott R. Abella, W. Wallace Covington, Peter Z. Fule, Leigh B. Lentile, Andrew J. Sanchez Meador, Penelope Morgan
Past, Present, And Future Old Growth In Frequent-Fire Conifer Forests Of The Western United States, Scott R. Abella, W. Wallace Covington, Peter Z. Fule, Leigh B. Lentile, Andrew J. Sanchez Meador, Penelope Morgan
Public Policy and Leadership Faculty Publications
Old growth in the frequent-fire conifer forests of the western United States, such as those containing ponderosa pine (Pinus ponderosa), Jeffrey pine (P. jeffreyi), giant sequoia (Sequioa giganteum) and other species, has undergone major changes since Euro-American settlement. Understanding past changes and anticipating future changes under different potential management scenarios are fundamental to developing ecologically based fuel reduction or ecological restoration treatments. Some of the many changes that have occurred in these forests include shifts from historically frequent surface fire to no fire or to stand-replacing fire regimes, increases in tree density, increased abundance of fire-intolerant trees, decreases in understory …