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Long-Distance Dispersal of Plants
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Long-distance dispersal (LDD) of plants poses challenges to research because it involves rare events driven by complex and highly stochastic processes. The current surge of renewed interest in LDD, motivated by growing recognition of its critical importance for natural populations and communities and for humanity, promises an improved, quantitatively derived understanding of LDD. To gain deep insights into the patterns, mechanisms, causes, and consequences of LDD, we must look beyond the standard dispersal vectors and the mean trend of the distribution of dispersal distances. ‘‘Nonstandard’’ mechanisms such as extreme climatic events and generalized LDD vectors seem to hold the greatest explanatory power for the drastic deviations from the mean trend, deviations that make the nearly impossible LDD a reality.
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Resources
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Climate Science Documents
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Long-term aspen cover change in the western US
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Quaking aspen (Populus tremuloides Michx.) is one of the most important tree species in the western United States due to its role in biodiversity, tourism, and other ecological and aesthetic values. This paper provides an overview of the drivers of long-term aspen cover change in the western US and how these drivers operate on diverse spatial and temporal scales. There has been substantial concern that aspen has been declining in the western US, but trends of aspen persistence vary both geographically and tem- porally. One important goal for future research is to better understand long-term and broad-scale changes in aspen cover across its range. Inferences about aspen dynamics are contingent on the spatial and temporal scales of inquiry, thus differences in scope and design among studies partly explain varia- tion among conclusions. For example, major aspen decline has been noted when the spatial scale of inquiry is relatively small and the temporal scale of inquiry is relatively short. Thus, it is important to consider the scale of research when addressing aspen dynamics.
Successional replacement of aspen by conifer species is most pronounced in systems shaped by long fire intervals and can thus be seen as part of a normal, long-term fluctuation in forest composition. Aspen decline was initially reported primarily at the margins of aspen’s distribution, but may be becoming more ubiquitous due to the direct effects of climate (e.g. drought). In contrast, the indirect effects of recent climate (e.g. forest fires, bark beetle outbreaks, and compounded disturbances) appear to favor aspen and may facilitate expansion of this forest type. Thus, future aspen trends are likely to depend on the net result of the direct and indirect effects of altered climate.
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Climate Science Documents
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Longleaf Legacy Landscape Viewer
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Located in
Fire Mapping
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Regional Fire Mapping
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Longleaf Legacy Landscape Viewer
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The Longleaf Legacy Landscape Viewer (LLLV) is a Tall Timbers web mapping application showcasing broad potential uses for the Florida Fires database built by Tall Timbers for the Florida Fish and Wildlife Conservation Commission. The map viewer provides fire history, species habitat and land cover data generalized to a 10-acre hexgrid covering the tri-state Longleaf Legacy Landscape area. The data is best used at large scales for display and query purposes.
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Fire Mapping
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Regional Fire Mapping
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Longleaf Legacy Landscape Viewer Image
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Longleaf Legacy Landscape Viewer Image
Located in
Fire Mapping
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Regional Fire Mapping
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Longleaf Legacy Landscape Viewer
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Lonhart 1999.pdf
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Located in
Resources
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TRB Library
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LAR-LEW
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Looking at the Big Picture: The Importance of Landbase Interactions Among Forests, Agriculture, and Climate Mitigation Policies
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Land use change is a key part of global
change. Deforestation, urban sprawl,
agriculture, and other human influences
have substantially altered natural ecosystems
and fragmented the global landscape.
Slowing down deforestation and
afforesting environmentally sensitive
agricultural land are important steps for
mitigating climate change. Because no
policy operates in a vacuum, however,
it’s important to consider how separate
climate mitigation policies might interact
with each other.
Ralph Alig, a scientist with the Pacific
Northwest Research Station, and his colleagues
evaluated the potential impacts
of policy instruments available for climate
change mitigation. By using the
Forest and Agriculture Sector Optimization
Greenhouse Gases model, the
researchers analyzed how land might
shift between forestry and agriculture
and to more developed uses depending
on different land use policies and several
carbon pricing scenarios. They also
examined the likely effects on timber,
crop prices, and bioenergy production
if landowners were paid to sequester
carbon on their land. The researchers
found that projected competition for raw
materials is greatest in the short term,
over the first 25 years of the 50-year
projections.
Climate change is occurring within a
matrix of other changes. By 2050, an additional
3 billion people are expected to
be living on Earth, needing food, clean
water, and places to live. Incentives
for landowners to maintain undeveloped
land will be vital to sequestering
carbon and providing other services of
intact ecosystems
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Resources
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Climate Science Documents
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Loosanoff et al 1966.pdf
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Located in
Resources
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TRB Library
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LEW-MAR
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Lopinot 1968 Illinois.pdf
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Located in
Resources
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TRB Library
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LEW-MAR
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Lopinot 1968.pdf
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Located in
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TRB Library
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LEW-MAR
