Filters: Tags: establishment (X)
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The Establishment Potential Surface for Ips typographus was produced in the State of Alaska conterminous in 1 square kilometer (km2) units by the U.S. Forest Service, Forest Health Technology Enterprise Teams (FHTET) Invasive Species Program.
The Establishment Potential Surface for Sirex noctilio was produced for the conterminous United States in 1 square kilometer (km2) units by the U.S. Forest Service, Forest Health Technology Enterprise Teams (FHTET) Invasive Species Steering Committee. The products intended use in conjunction with the Introduction Potential Surface is to develop a Susceptibility Potential Surface for Sirex noctilio. Four primary datasets with standardized values from 0 to 10 were used as variables in the analysis. Each dataset was multiplied by its arithmetic weight and the resultant values were combined in a weighted overlay (Eastman 1999). The final Establishment Potential Surface output values also range from 0 to 10; with 10...
The Susceptibility Potential Surface for Ips typographus was produced for the State of Alaska in 1 square kilometer (km2) units by the USDA Forest Service, Forest Health Technology Enterprise Team's (FHTET) Invasive Species Program. Supporting information for this product was taken from Exotic Forest Pest (ExFor) website http://spfnic.fs.fed.us/exfor/).
Willow communities dominate mid-elevation riparian areas throughout the Rocky Mountains of North America. However, many willow stands are rapidly declining in aerial cover and individual plants in stature. A poor understanding of the processes that control willow establishment hinders identifying the causes of this decline. We analysed the processes that have facilitated or limited willow establishment over the last half of the 20th century on two large floodplains in Rocky Mountain National Park in Colorado by addressing two questions: (1) How does hydrologic regime control willow establishment on different fluvial landforms? (2) How might climate-driven variations in hydrologic regime affect future willow establishment?...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Hydrological Processes,
RHESSys model,
Rocky Mountains,
Salix,
climate,
The Establishment Potential Surface for Ips typographus was produced for the conterminous United States in 1 square kilometer (km2) units by the U.S. Forest Service (USFS), Forest Health Technology Enterprise Teams (FHTET) Invasive Species Steering Committee; a multidisciplinary team with participation from USFS and the USDA Animal and Plant Health Inspection Service (APHIS). Supporting information for this product was taken from Exotic Forest Pest (ExFor) website (http://spfnic.fs.fed.us/exfor/).
In laboratory germination studies with 15 collections ofAtriplex confertifolia, a dominant shrub of North American salt deserts, we found that seeds were dormant and largely unresponsive to chilling at dispersal but became chilling-responsive through dry after-ripening. Collections from warm desert habitats were more chilling-responsive and after-ripened more rapidly than those from cold desert habitats. In a field seed bank experiment, germination did not take place until the second spring, and 30% of the seeds remained viable and ungerminated after five springs. Cold desert collections showed highest seed bank carryover. Spring germination and seed bank carryover across years are important aspects of shadscale...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Journal of Arid Environments,
dormancy,
establishment,
salt desert,
saltbush,
In a water-limited system, the following hypotheses are proposed: warming will increase seedling mortality; elevated atmospheric CO2 will reduce seedling mortality by reducing transpiration, thereby increasing soil water availability; and longevity (i.e. whether a species is annual or perennial) will affect the response of a species to global changes. Here, these three hypotheses are tested by assessing the impact of elevated CO2 (550 micromol mol(-1) and warming (+2 degrees C) on seedling emergence, survivorship and establishment in an Australian temperate grassland from autumn 2004 to autumn 2007. Warming impacts on seedling survivorship were dependent upon species longevity. Warming reduced seedling survivorship...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: New Phytologist,
climate change and global warming,
elevated CO2,
emergence,
establishment,
Tree loss is increasing rapidly due to drought- and heat-related mortality and intensifying fire activity. Consequently, the fate of many forests depends on the ability of juvenile trees to withstand heightened climate and disturbance anomalies. Extreme climatic events, such as droughts and heatwaves, are increasing in frequency and severity, and trees in mountainous regions must contend with these landscape-level climate episodes. Recent research focuses on how mortality of individual tree species may be driven by drought and heatwaves, but how juvenile mortality under these conditions would vary among species spanning an elevational gradient—given concurrent variation in climate, ecohydrology, and physiology–remains...
Categories: Publication;
Types: Citation;
Tags: Climate Change,
Drought,
Establishment,
Forest Regeneration,
Heatwave,
This is a continuous raster dataset identifying areas that are priority for grassland establishment to increase the quantity and/or quality of mottled duck nesting habitat in the Western Gulf Coast. The identification process is based on key biological parameters such as patch size, land use type, distance to brood rearing habitat, etc. Additionally, this raster datasets presents the data in a form that prioritizes habitat from more suitable to less suitable based on landscape metrics. The scale ranges from 1 to 0, higher value designating higher priority for grassland establishment.
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service;
Tags: MODU,
Mottled Duck,
dst,
establishment,
grassland,
The Susceptibility Potential Surface for Ips typographus was produced for the Conterminous United States (CUS) in 1 square kilometer (km2) units by the USDA Forest Service, Forest Health Technology Enterprise Teams (FHTET) Invasive Species Steering Committee; a multidisciplinary team with participation from USFS and APHIS. Supporting information for this product was taken from Exotic Forest Pest (ExFor) website http://spfnic.fs.fed.us/exfor/).
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