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Showing 1 to 20 of 23 for “"spruce-fir"”.
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Stand structure, growth, and mortality in southern Appalachian spruce-fir
… m) permanent plots at three southern Appalachian spruce-fir sites (Mt. Rogers National Recreation Area (NRA) of Virginia, the Black Mountains of North Carolina, and the Great Smoky Mountains of Tennessee and North Carolina). Baseline conditions were documented to accommodate future efforts to …
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Modeling forest protection values for the southern Appalachian spruce-fir forest
Household economic value for southern Appalachian spruce-fir forest protection may be sensitive to changes in the forest's physical condition. Further, different recreation groups may hold significantly dissimilar values for forest protection. Household and recreation group willingness to pay for …
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Site factors determining epiphytic lichen distribution in a dieback-affected spruce-fir forest on Whiteface Mountain, New York
In einem Abies balsamea-Picea rubens-Bestand am Whiteface Mountain im US-Bundesstaat New York wurde die epiphytische Diversität der Flechtenvegetation zwischen gesunden und immissionsgeschädigten Rotfichten (Picea rubens) sowie zwischen Rotfichte und Balsamtanne (Abies balsamea) miteinander …
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VEGETATIVE REPRODUCTION BY LAYERING VERSUS SEXUAL REPRODUCTION IN A SPRUCE-FIR FOREST AT ALPINE TREELINE, MEDICINE BOW MOUNTAINS, USA
… in the Medicine Bow National Forest, Engelmann spruce (<italic>Picea engelmannii</italic>) and subalpine fir (<italic>Abies lasiocarpa</italic>), possess the ability to reproduce asexually through the vegetative process of layering. The current study investigated the frequency of vertical stems …
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Competitive status of red spruce (Picea rubens) and Fraser fir (Abies fraseri) at ecotonal transitions in southern Appalachian sky islands
Southern Appalachian spruce-fir sky islands are globally threatened, boreal relict forests where red spruce (Picea rubens) and Fraser fir (Abies fraseri) are dominant. Fraser fir dominates at the highest elevations with spruce-fir and spruce-dominated stands at middle elevations and hardwoods …
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Effect of fire and wind-throw on a forest area
… is a quantitative analysis of the effect of fire and wind-throw on a spruce-fir-northern hardwoods forest on Peaks Island, Casco Bay, Maine. Six years after the burn, data for the effect of fire on approximately 170 acres of this forest type, were collected and categorized. The qualitative …
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Assessing the Impacts of Balsam Woolly Adelgid (Adelges Piceae Ratz.) and Anthropogenic Disturbance on the Stand Structure and Mortality of Fraser Fir (Abies Fraseri (Pursh) Poir.) in the Black Mountains, North Carolina
… naturally occurring populations of Fraser fir (Abies fraseri) in the Black Mountains of North Carolina have been heavily impacted by both direct and indirect anthropogenic disturbances, including logging and logging- associated fires, and high mortality rates due to the introduction of the …
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Taxonomy, genesis, and parent material distribution of high- elevation forest soils in the southern Appalachians
High-elevation spruce-fir forests in the southern Appalachians may potentially be in a state of decline as a result of either natural or anthropogenic causes. Soils were investigated in areas representative of 117 permanent intensive field plots established to evaluate changes in forest composition …
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The Importance of Fog for Carbon Gain, Water Balance, and Foliar Uptake in Southern Appalachian Cloud Forests
… the coffee forests of Angola, and the relic spruce-fir communities of the southern Appalachian Mountains, USA. In these climates cloud immersion can provide an important subsidy of moisture that can improve plant water relations as well as photosynthetic status through alleviation of high …
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Deposition and Fate of Atmospheric Mercury in Forested Landscapes of the Adirondack Park, NY
… forest types: deciduous/hardwood forest, spruce/fir conifer forest, and stunted growth alpine/fir forest. Throughfall Hg inputs and Hg accumulation in organic soils were greater in the spruce/fir and alpine areas than the deciduous forest areas. Estimates of cloud water Hg deposition …
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The Physiological Ecology of Fraser FIr in Southern Appalachian Cloud Forests
Fraser fir (Abies fraseri (Pursh.) Poiret is a tree species endemic to the southern Appalachian Mountains, USA. This species is found in only six mountain-top populations in that span between southwestern Virginia and the Great Smoky Mountains of western North Carolina and eastern Tennessee. …
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Isozyme variation within the Fraser fir population on Mt. Rogers, Virginia
The Fraser fir (Abies fraseri (Pursh) Poir.) on Mt. Rogers is an isolated relic population and part of the southern Appalachian spruce-fir ecosystem. The population has, so far, been able to withstand the impacts of insect infestation and the possible influence of atmospheric deposition factors …
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Red spruce physiology and growth in response to elevated CO₂, water stress and nutrient limitations
Spruce-fir ecosystems of the eastern United States interest scientists because of reported changes in population growth. Whether red spruce (Picea rubens Sarg.) populations are declining because of disease, pollution or environmental stress or experiencing natural changes in stand development is …
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Long-term changes in forest soils of Maine and Illinois
… 3) examine soil formation processes in a Maine spruce-fir soil. This thesis is divided into two parts based on field site locations and experimental designs from previous studies: 1) a study utilizing buried soil-bags at Howland, Maine, and 2) a resampling of soils at Robert Allerton Park, …
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Landscape Ecology of Birds on Mount Leconte, Great Smoky Mountains National Park
… species and how bird species responded to the spruce-fir community.</p> <p>Using a form of the variable-circular plot method, I conducted audio-visual censuses of diurnal birds on Mount LeConte. I established 212 geo-referenced census points on six trails, which were used as gradient-oriented …
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The response of a Rocky Mountain forest system to a shifting disturbance regime
… may lead to increasing disturbances from wildfire, insect outbreaks, drought, and extreme weather events, which may greatly accelerate rates of ecosystem change. However, the role of disturbance in shaping forest response to climate change is not well understood. Better understanding the …
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Effects Of Calcium Addition On Structure And Bioavailability Of Soil Organic Matter
… its richness in carbohydrates, which was also confirmed by a molecular mixing model. The soil organic matter decreased in its O-alkyl C and carbohydrate proportion with soil depth due to decomposition and increased in its refractory fraction, represented by alkyl C and lipids proportion. These …
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