Auswahl der wissenschaftlichen Literatur zum Thema „White River National Forest (Colo.)“
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Zeitschriftenartikel zum Thema "White River National Forest (Colo.)"
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Sun, Shiquan, Yang Hong, Jinhao Guo, Ning Zhang und Minghai Zhang. „Landscape Dynamics and Ecological Risk Assessment of Cold Temperate Forest Moose Habitat in the Great Khingan Mountains, China“. Biology 12, Nr. 8 (11.08.2023): 1122. http://dx.doi.org/10.3390/biology12081122.
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The change in habitat pattern is one of the key factors affecting the survival of the moose population. The study of the habitat landscape pattern is the key to protecting the Chinese cold-temperate forest moose population and monitoring the global distribution of moose. Through the ecological risk assessment of the moose habitat landscape pattern in a cold-temperate forest, we hope to assess the strength of habitat resistance under stress factors. This study provides a theoretical basis for the protection of the moose population in the cold-temperate forest in China and the establishment of the cold-temperate forest national park. In the study, the MaxEnt model, landscape index calculation and ecological risk assessment model construction were used to analyze the field survey and infrared camera monitoring data from April 2014 to January 2023. The habitat suitability layer of the moose population in the Nanwenghe National Nature Reserve of the Great Khingan Mountains was calculated, and the range of the moose habitat was divided based on the logical threshold of the model. The landscape pattern index of the moose habitat was calculated by Fragstats software and a landscape ecological risk assessment model was established to analyze the landscape pattern and ecological risk dynamic changes of the moose habitat in 2015 and 2020. The results showed that under the premise of global warming, the habitat landscape contagion index decreased by 4.53 and the split index increased by 4.86 from 2015 to 2020. In terms of ecological risk: the area of low ecological risk areas increased by 0.88%; the area of medium ecological risk areas decreased by 1.11%; and the area of high ecological risk areas increased by 0.23%. The fragmentation risk of the landscape pattern of the moose habitat tends to increase, the preferred patch type is dispersed, the degree of aggregation is low, and the risk of patch type transformation increases. The middle and high ecological risk areas are mainly concentrated in the river area and its nearby forests, showing a fine and scattered distribution. Under the interference of global warming and human activities, the fragmentation trend of the moose habitat in the study area is increasing, and the habitat quality is declining, which is likely to cause moose population migration. For this reason, the author believes that the whole cold temperate forest is likely to face the risk of increasing the transformation trend of dominant patch types in the cold-temperate coniferous forest region mainly caused by global warming, resulting in an increase in the risk of habitat fragmentation. While the distribution range of moose is reduced, it has a significant impact on the diversity and ecological integrity of the whole cold-temperate forest ecosystem. This study provides theoretical references for further research on the impact of climate warming on global species distribution and related studies. It is also helpful for humans to strengthen their protection awareness of forest and river areas and formulate reasonable protection and sustainable development planning of cold-temperate forests. Finally, it provides theoretical references for effective monitoring and protection of cold-temperate forests and moose population dynamics.
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Kent, B., P. Kaval, J. Berry, M. Retzlaff, D. Hormaechea und D. Shields. „A role for stakeholder objectives in USDA Forest Service plan revisions: A case study on the White River National Forest“. International Transactions in Operational Research 10, Nr. 5 (September 2003): 515–42. http://dx.doi.org/10.1111/1475-3995.00425.
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Dowsett-Lemaire, F., und R. J. Dowsett. „Birds of the Lobéké Faunal Reserve, Cameroon, and its regional importance for conservation“. Bird Conservation International 10, Nr. 1 (März 2000): 67–87. http://dx.doi.org/10.1017/s095927090000006x.
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The Faunal Reserve of the Lobéké area of south-eastern Cameroon is an important area for forest conservation. One day, it is hoped, it will be part of an international unit, in association with two protected areas in neighbouring countries (Dzanga-Ndoki National Park, Central African Republic and Nouabalé-Ndoki National Park, Congo). With a view to assessing the status of its avifauna in particular, 24 days were spent in three short surveys from 1997 to 1999. The main forest type is semi-evergreen, with an open canopy; the only natural savannas are small saline swamps. The total of 305 species of bird recorded includes a forest nightjar not yet identified (but more likely to be the rare Itombwe Nightjar Caprimulgus prigoginei than a new species) and the Dja River Warbler Bradypterus grandis. The latter is a species confined to Rhynchospora swamps and had not been re-located in Cameroon since it was first collected in 1914 west of the Dja river; the extent of suitable habitat in Lobéké makes this site the most important to date for its conservation. Other rare or little-known forest species recorded include Olive Ibis Bostrychia olivacea, Sandy Scops Owl Otus icterorhynchus, Zenker's Honeyguide Meligomon zenkeri, Tessmann's Flycatcher Muscicapa tessmanni and Yellow-capped Weaver Ploceus dorsomaculatus. Barred Owlet Glaucidium capense is locally common in open-canopy forest: this population was only recently discovered in central Africa and its taxonomic relationships have yet to be determined. We include a brief comparison with the avifauna of adjacent Dzangha-Ndoki National Park and Nouabalé-Ndoki National Park. A feature of the Lobéké avifauna is the presence of a few species normally associated with forest at higher altitudes (such as White-headed Wood Hoopoe Phoeniculus bollei, Uganda Woodland Warbler Phylloscopus budongoensis, Black-throated Apalis Apalis jacksoni), and perhaps absent from lower-lying Nouabalé-Ndoki.
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David, Gabrielle C. L., Brian P. Bledsoe, David M. Merritt und Ellen Wohl. „The impacts of ski slope development on stream channel morphology in the White River National Forest, Colorado, USA“. Geomorphology 103, Nr. 3 (Februar 2009): 375–88. http://dx.doi.org/10.1016/j.geomorph.2008.07.003.
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Jurgens, Joel A., Robert A. Blanchette, Paul J. Zambino und Andrew David. „Histology of White Pine Blister Rust in Needles of Resistant and Susceptible Eastern White Pine“. Plant Disease 87, Nr. 9 (September 2003): 1026–30. http://dx.doi.org/10.1094/pdis.2003.87.9.1026.
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White pine blister rust, Cronartium ribicola, has plagued the forests of North America for almost a century. Over past decades, eastern white pine (Pinus strobus) that appear to tolerate the disease have been selected and incorporated into breeding programs. Seeds from P. strobus with putative resistance were collected from Oconto River Seed Orchard, Nicolet National Forest, WI. Seedlings were grown for 5 months and artificially inoculated with basidiospores of C. ribicola in two replicated greenhouse experiments. Needles from infected seedlings were fixed, sectioned, and stained with a variety of histological reagents, and rate of mortality for the remaining seedlings was monitored. The most susceptible families suffered 50% mortality in approximately half the time of the more resistant families. Extensive inter- and intracellular hyphae were observed in needles from seedlings of susceptible families, whereas hyphal proliferation was restricted in needles of resistant seedlings. Needles from resistant families had pronounced responses to infection. Phenolics, observed with phloroglucinol-HCl staining, were deposited around infection sites where dense mycelial masses were present. Abnormal host cell growth and rapid cell death in the immediate area of infection were also observed in some eastern white pine families.
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Jiménez, E. M., F. H. Moreno, J. Lloyd, M. C. Peñuela und S. Patiño. „Fine root dynamics for forests on contrasting soils in the colombian Amazon“. Biogeosciences Discussions 6, Nr. 2 (30.03.2009): 3415–53. http://dx.doi.org/10.5194/bgd-6-3415-2009.
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Abstract. It has been hypothesized that in a gradient of increase of soil resources carbon allocated to belowground production (fine roots) decreases. To evaluate this hypothesis, we measured the mass and production of fine roots (<2 mm) by two methods: 1) ingrowth cores and, 2) sequential soil coring, during 2.2 years in two lowland forests with different soils in the colombian Amazon. Differences of soil resources were determined by the type and physical and chemical properties of soil: a forest on loamy soil (Ultisol) at the Amacayacu National Natural Park and, the other on white sands (Spodosol) at the Zafire Biological Station, located in the Forest Reservation of the Calderón River. We found that mass and production of fine roots was significantly different between soil depths (0–10 and 10–20 cm) and also between forests. White-sand forest allocated more carbon to fine roots than the clayey forest; the production in white-sand forest was twice (2.98 and 3.33 Mg C ha−1 year−1, method 1 and 2, respectively) as much as in clayey forest (1.51 and 1.36–1.03 Mg C ha−1 year−1, method 1 and 2, respectively); similarly, the average of fine root mass was higher in the white-sand forest (10.94 Mg C ha−1) than in the forest on clay soils (3.04–3.64 Mg C ha−1). The mass of fine roots also showed a temporal variation related to rainfall, such that production of fine roots decreased substantially in the dry period of the year 2005. Our results suggest that soil resources play an important role in patterns of carbon allocation in these forests; carbon allocated to above-and belowground organs is different between forest types, in such a way that a trade-off above/belowground seems to exist; as a result, it is probable that there are not differences in total net primary productivity between these two forests: does belowground offset lower aboveground production in poorer soils?
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SHRESTHA, Gajendra, Steven L. PETERSEN und Larry L. ST. CLAIR. „Predicting the distribution of the air pollution sensitive lichen species Usnea hirta“. Lichenologist 44, Nr. 4 (08.06.2012): 511–21. http://dx.doi.org/10.1017/s0024282912000060.
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AbstractUsnea hirta, an important member of the lichen family Parmeliaceae, has long been used as a bio-monitor of air pollution, particularly of sulphur dioxide in North America. Although U. hirta has a wide geographical distribution, it is important to be able to identify accurately the optimal habitat conditions for air pollution-sensitive species, thus making it possible to more effectively and efficiently establish air quality bio-monitoring stations. We modelled the distribution of U. hirta as a function of nine variables, five macroclimatic variables: average monthly precipitation, average monthly minimum temperature, average monthly maximum temperature, solar radiation, and integrated moisture index, and four topographic variables: elevation, slope, aspect, and land forms and uses for the White River National Forest, Colorado. The response variable was developed based on the presence or absence of U. hirta at each of 72 bio-monitoring baseline sites established in selected portions of four intermountain area states. Our model was developed using Non-Parametric Multiplicative Regression (NPMR) analysis, a modelling approach that analyzes environmental gradients, or predictor variables, against known locations for individuals of the model species. Finally, we evaluated our model on the basis of log β values and overall improvement over a naïve model and the Monte Carlo Permutation Test with 1000 randomized runs. The best model for U. hirta included four variables – solar radiation, average monthly precipitation, and average monthly minimum and maximum temperatures (log β=3·68). Among these four variables, average monthly maximum temperature was the most influential predictor (sensitivity=0·71) for the distribution of U. hirta. The occurrence rate for U. hirta, based on field validation, was 45·5%, 65·4%, and 70·4% for low, medium, and high probability areas, respectively. This study showed that our model was successful in predicting the distribution of U. hirta in the White River National Forest. Based on these results, the north-eastern and western portions of the forest appear to offer the most favourable conditions for the installation of future air quality bio-monitoring baseline sites.
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Blankenship, Beth A., und Mary A. Arthur. „Prescribed Fire Affects Eastern White Pine Recruitment and Survival on Eastern Kentucky Ridgetops“. Southern Journal of Applied Forestry 23, Nr. 3 (01.08.1999): 144–50. http://dx.doi.org/10.1093/sjaf/23.3.144.
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Abstract Successful fire prevention and suppression efforts during the past 50 yr have resulted in the proliferation of eastern white pine (Pinus strobus L.) in the understory of oak-pine forests on the Cumberland Plateau. Along with red maple (Acer rubrum L.), increasing density of eastern white pine in these forests signals a change in plant species composition from species adapted to periodic surface fires, such as oaks (Quercus spp.) and yellow pines (P. echinata Miller and P. rigida Miller), to species adapted to longer fire-free intervals. In the Daniel Boone National Forest (DBNF) in eastern Kentucky, the USDA Forest Service has reintroduced fire to these ridgetop ecosystems. In March 1995 and March 1996, single prescribed fires were conducted on three different ridgetops in the Red River Gorge of the DBNF. Diameter and age of white pine stems were recorded prior to burning, two growing seasons post-burn (for 1995 and 1996 fires), and three growing seasons post-burn (for 1995 fires only). Nearly all white pine less than 2.0 cm dbh were killed after a single prescribed fire, and significant mortality (P < 0.05) was measured in size classes up to 6 cm dbh. Post-burn regeneration of white pine, however, was abundant at each site. Therefore, a single prescribed burn affected the age structure of white pine but will not have an important influence on long-term species composition of these stands. A fire return interval of at least 10 to 20 yr will be required to control white pine competition with fire-adapted species on the ridgetop ecosystems of the DBNF. South. J. Appl. For. 23(3): 144-150.
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VOGEL, DAVID. „Business Support for Nature Protection in the Nineteenth Century“. Journal of Policy History 34, Nr. 2 (April 2022): 276–94. http://dx.doi.org/10.1017/s0898030622000045.
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AbstractThis article explores the role of business in supporting and benefiting from nature protection during the second half of the nineteenth century. It begins with the support of business for protecting scenic wilderness in California and the creation of Yellowstone, as well as the role of the railroads in encouraging easterners to visit to the nation’s western national parks—all designed to create economic value by promoting tourism. It then examines the efforts of a wide range of business interests to protect the White Mountains of New Hampshire and the Adirondack forest in New York State. The later effort was led by business interests from New York City who worried that deforestation would impair freight traffic on the Erie Canal and Hudson River as well as endanger the city’s water supplies. This article compliments Hay’s research on business and conservation during the Progressive Era by demonstrating that business also played a critical role in supporting wilderness and forest protection.
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Baranovsky, B. A., I. A. Ivanko, A. V. Kotovych, L. A. Karmyzova und N. O. Roschina. „Analysis of trophic structure of forest flora in the Oril River valley“. Fundamental and Applied Soil Science 18, Nr. 3-4 (12.12.2017): 37–50. http://dx.doi.org/10.15421/041714.
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Biodiversity is important for maintaining of forest ecosystems functioning and in their resistance to anthropo-climatic challenges. Assessment of species diversity and species ecomorphic analysis is the basis for determining their current status, rational use and protection. At the end of the nineteenth century, Belgard A. L. (1950) in his system of ectomorphs using terminology presented by Dekandol (1956) and Warming (1903), had proposed a «trophomorph» category that reflected species relation to soil richness. Analysis of trophomorphs reflects diversity of soil conditions in different biotopes within forest ecosystems. The article gives an analysis on vascular plant trophomorphs distribution in various forest biotopes of Oril river valley. Flora and vegetation surveys in forests of Oril river valley were carried out by A. L. Belgard and T. F. Kirichenko since the 30s of the 20th century. The latest data on forest vegetation state within the Oril river valley were given in the works of Y. Gamulja and V. Manyuk. Generalized bioecological analysis of flora Oril river valley was represented in the monograph of B. Baranovsky, V. Maniuk, I. Ivanko, L. Karmyzova «Flora analysis of the Oril National Park». As is known, edaphic conditions of plant habitats in a first place are determined by soil fertility depending on the plant nutrients availability. Soddy-forest soil on sandy terrace of Oril river valley has a relatively low content of humus and total nitrogen: 2 and 0.04 %. Under these conditions, pine phytocenoses were ocсurred that represented exclusively by artificial plantings. Soils in the depressed area of Oril river floodplain are much richer in humus and nitrogen content (10 and 0.37 %). Here, arboreal and shrubby vegetation is represented by communities with common oak. On the second terrace of Oril river valley, forest vegetation is represented by artificial pine forests. Microcenoses with black locust, amorpha and willow occurred on elevated areas of sandy terrace (arena). In the depressed area of the arena, microcenoses with aspen and birch, aspen, Tatarian maple, amorpha, black locust were occurred additionally to pine communities. In the Oril floodplain, native arboreal and shrubby vegetation is represented mainly by communities with common oak. In depressed areas of the floodplain, microcenoses with white poplar, black poplar, aspen, Tatarian maple, amorpha, willow (Salix alba, S. fragilis), osiery (Salix cinerea, S. triandra), and alder are fragmentarily occurred. In conditions of elevated areas of the floodplain, 196 vascular plants species were found, and 105 species in depressed areas. On the second terrace, 38 plant species grow on the elevated areas, and 54 species on the depressed ones. Flora includes 45 adventive plant species. In depressed floodplain areas, oligotrophs are represented by 7 species, mesotrophs by 126 species, megatrophs by 50 species, and in elevated areas: 7, 126 and 25 species, respectively. In depressed areas of arena oligotrophs are represented by 4 species, mesotrophs by 29 species, and megatrophs by 11, elevated areas: 7 and 21 species respectively, and megatrophs were absent.
Dissertationen zum Thema "White River National Forest (Colo.)"
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Shrestha, Gajendra. „Predicting the Distribution of Air Pollution Sensitive Lichens Using Habitat Niche Modeling“. BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2595.
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Usnea hirta and Xanthoparmelia cumberlandia are commonly used as bio-monitors of air quality. In order to more accurately and efficiently determine the distribution of these two sensitive indicator species, we have developed a probabilistic distribution map as a function of 9 macroclimatic and topographic variables for the White River National Forest, Colorado using Non-Parametric Multiplicative Regression (NPMR) analysis. Furthermore, we also developed a logistic regression (LR) model for X. cumberlandia in order to evaluate the strengths and limitations of the NPMR model. The best model for U. hirta included four variables - solar radiation, average monthly precipitation, average monthly minimum and maximum temperature (log β = 3.68). The presence rate for U. hirta based on field validated test sites was 45.5%, 65.4%, and 70.4% for low, medium, and high probability areas, respectively. The best model for X. cumberlandia generated by both NPMR and LR involved the same variables - solar radiation, average monthly maximum temperature, average monthly precipitation, and elevation as the best predictor variables (log β = 5.10). The occurrence rate for X. cumberlandia using the NPMR model was 32%, 44.4%, and 20% for the low, medium, and high probability areas respectively while the LR model had 26%, 50%, and 38% for low, medium and high probability areas respectively. Although the LR model predicted a smaller high probability area compared to the NPMR model there was substantial overlap between the two. The U. hirta model performed better than the X. cumberlandia model. The reduced performance of our model especially for X. cumberlandia may be due in part to the absence of field measured data in the development of the model. Our study also suggested that the northeast and western part of the forest should be preferentially considered for establishing future air quality bio-monitoring reference sites. Finally, in the future a well defined sampling design with sufficient sampling sites, field measured predictor variables, and microclimatic data should be used in the development of predictive models.
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Pulsford, Ian Frank. „History of disturbances in the white cypress pine (Callitris glaucophylla) forests of the lower Snowy River Valley, Kosciusko National Park“. Thesis, 1991. http://hdl.handle.net/1885/143071.
Der volle Inhalt der QuelleBücher zum Thema "White River National Forest (Colo.)"
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US GOVERNMENT. An Act to Transfer the Dillon Ranger District in the Arapaho National Forest to the White River National Forest in the State of Colorado. [Washington, D.C.?: U.S. G.P.O., 1997.
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House, United States Congress, Hrsg. WHITE RIVER NATIONAL FOREST, COLO. BOUNDARY ADJUSTMENT... REPT... 105-113... COMM. ON RESOURCES... HOUSE OF REPRESENTATIVES... ON RESOURCES. [S.l: s.n., 1997.
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United States. Forest Service. Rocky Mountain Region. White River National Forest. Glenwood Springs, CO]: United States Dept. of Agriculture, Forest Service, Rocky Mountain Region, 2002.
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Service, United States Forest, Hrsg. Your Christmas tree: White River National Forest. [Washington, D.C.?]: U.S. Dept. of Agriculture, Forest Service, 2001.
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Aspen Ranger District (Colo.) und United States. Dept. of Agriculture, Hrsg. Aspen recreation guide: White River National Forest. 2. Aufl. Aspen, CO: Aspen Ranger District, 2002.
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Aspen Ranger District (Colo.) und United States. Dept. of Agriculture., Hrsg. Aspen recreation guide: White River National Forest. 2. Aufl. Aspen, CO: Aspen Ranger District, 2002.
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United States. Forest Service. Aspen Ranger District. und United States. Dept. of Agriculture., Hrsg. Aspen recreation guide: White River National Forest. 2. Aufl. Aspen, CO: Aspen Ranger District, 2002.
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Aspen Ranger District (Colo.) und United States. Dept. of Agriculture., Hrsg. Aspen recreation guide: White River National Forest. 2. Aufl. Aspen, CO: Aspen Ranger District, 2002.
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Service, United States Forest, Hrsg. Forest Plan Focus, White River National Forest, August 1997. [S.l: s.n., 1997.
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Service, United States Forest, Hrsg. White River National Forest oil and gas leasing analysis. [Glenwood Springs, CO] (9th & Grand, P.O. Box 948, Glenwood Springs 81602): Forest Service, Dept. of Agriculture, 1991.
Den vollen Inhalt der Quelle findenBuchteile zum Thema "White River National Forest (Colo.)"
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Emblidge, David. „New Hampshire“. In The Appalachian Trail Reader, 316–49. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195100914.003.0019.
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Abstract Above tree line on Mt. Lafayette, in the Franconia Range, White Mts., New Hampshire. Trail miles: 160.6 Trail maintenance: Dartmouth Outing Club, Appalachian Mountain Club Highest point: Mt. Washington, 6,288 ft. >Broadest river: Connecticut (shared with New Hampshire), crossable by bridge Features: Extensive hiking above tree line in the Presidential Range and Franconia Range of White Mt. National Forest. Wild, unpredictable weather. Many peaks above tree line and several over 5,000 ft. Hut system (lodges accommodating 36 to 90 guests). Fragile, beautiful alpine flowers, shrubs, lichens. Pinkham Notch Camp, at the eastern foot of Mt. Washington, a full-service outdoor recreation center staffed by Appalachian Mt. Club.
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Lorbiecki, Marybeth. „A Wild Proposal: 1919– 1924“. In A Fierce Green Fire. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199965038.003.0013.
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On August 1, 1919, Aldo was appointed to the second-highest position in District 3—Assistant Forester in Charge of Operations. Numerous foresters grumbled that Leopold didn’t deserve the job and was hardly suited to its enormous responsibilities. He hadn’t proven he was versed enough in all aspects of forestry management to handle the overarching tasks of inspecting every forest, reporting on what he found, and suggesting improvements. Leopold had a rigorous schedule to follow—three forests per summer, with a month at each. Since the Forest Service had no set inspection method, Leopold had to develop his own. His first reports were sketchy. He wrote more comments on rangers’ initiative and reading habits than on the details of their work or the conditions of their fire stations. During a late-summer tour of his old stomping ground, the Carson, Leopold roved further south into the Datil Forest. He fished away a Sunday at the headwaters of the Gila River and came away relaxed and refreshed. No telephone poles or roads cut across the landscape; there were just the pines; the trout; the tingle of fresh, pungent air; and a breeze alive with bird calls. Few areas like this remained in District 3. Was there, he wondered, a legal way to preserve the canyonlands around the Gila just as they were? That December, at a meeting of district foresters in Salt Lake City, Leopold heard about a young forest assistant named Arthur Carhart from District 2 in Colorado. Carhart, the Forest Service’s first landscape architect, had been dubbed the “Beauty Engineer” by his coworkers. Carhart had recommended that Trappers Lake, in the White River National Forest, be permanently preserved in a wilderness state—no so-called improvements. On his return trip, Leopold stopped by the D-2 offices to meet the man. Up to this point, attempts to set aside natural areas in the national forests led only to national parks or “primitive areas” that were open to later development. Leopold did not trust the park system to preserve any wilderness area intact.
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Lane, Belden C. „Venturing Out: The Irish Wilderness and Columba of Iona“. In Backpacking with the Saints. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199927814.003.0011.
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I put in at Greer Crossing, planning to float the twenty-one miles to Riverton over the next three days. Canoeing the Eleven Point River—a National Wild and Scenic Riverway near the Arkansas border—is a quintessential Ozark experience. The stream skirts the western boundary of the Irish Wilderness, a 16,500-acre area of the National Wilderness system. It’s a pocket of dense forest, sparkling creeks, and limestone caves as wild as the wooded glens of Ireland’s Wicklow Mountains. The place abounds with white-tailed deer, bobcats, raccoons, gray foxes, brown trout, and songbirds galore. A Celtic mystery lurks in this secluded Missouri landscape. I like to think of the Irish Wilderness as connecting me with my family roots in Ireland and Cornwall, near Land’s End in southwest England. It takes me back to a spiritual practice of wilderness wandering firmly rooted in the Celtic tradition. The Druids would have loved this part of southern Missouri. A dozen species of oak spread their branches overhead. Colonies of mayapples thrive along the trail. The limestone bluffs above the river are scattered with dolomite crystals. Canoeing downstream, you hear the sound of a beaver tail slapping the water to warn its kits as you round a bend. Ducking under the branches of an overhanging sycamore tree, you’re surprised by a harmless rat snake resting on a limb. With each stroke, the paddle dips into crystal-clear water rising from underground springs. There are times in your life when you realize you need a discipline. You have to decide about where you’re going (or not going). That’s why I’m here—to renew a spiritual regimen in my life, venturing out so as to find my way back in again. Salmon do it instinctively as a part of their life cycle, swimming upstream to their source. Naturalist Freeman House says that humans and salmon are a lot alike: “We are related by virtue of the places to which we choose to return.” I, too, need to revert from time to time to the primeval wonders of great blue herons and hazelnut trees . . . to an untamed Celtic landscape.
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Wilshire, Howard G., Richard W. Hazlett und Jane E. Nielson. „Tragedy of the Playground“. In The American West at Risk. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780195142051.003.0016.
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“Recreation” connotes revitalization, the re-creation of spirit. In an increasingly urbanized culture, people recreate in natural settings to lift their spirits and revitalize their outlook and motivation. Public lands in the western United States, which embrace much of the nation’s remaining natural and wild areas, are especially attractive—and most are open for recreation. We authors certainly have found solace from camping, hiking, climbing, and skiing in backcountry areas. But latetwentieth- century American affluence has created a massive and unprecedented invasion of these lands, and particularly an invasion of motorized recreation. All human uses of natural areas can, and generally do, degrade soils, kill plants, and increase erosion rates, with resultant water pollution and ecosystem damage. In small numbers, and spread out widely, recreational disturbances can be minor, but millions of people regularly play on western public lands in mass gatherings that have large cumulative impacts. More now drive vehicles across forested or desert areas than pursue the less-damaging activities of hiking and small-group camping. The Bureau of Land Management (BLM) and U.S. Department of Agriculture’s Forest Service (USFS) oversee the largest amount of western land available for recreation. By law, the agencies must manage public lands for multiple uses and “sustained yield.” Instead, federal land-management agencies are partitioning them to separate incompatible pursuits, including many that consume land. For example, as logging, mining, and grazing pressures ease, recreational pressures are exploding in Colorado’s White River National Forest, a short 50 miles west of Denver on Interstate Highway 70. Along with Denver’s increasing population, snowmobile registrations jumped 70% in Colorado since 1985. Off-road vehicles (ORVs) are everywhere, and mountain bike use has jumped more than 200%. Between 1990 and 2004, all ORV registrations in Colorado increased more than 650%. Ski facilities also burgeoned, along with hiker and equestrian demands for greater backcountry access. The USFS’s efforts to bring the conflicting uses under control is losing ground rapidly.
Konferenzberichte zum Thema "White River National Forest (Colo.)"
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Ledeczi, Anna, und Miranda Seixas. „CAVE AND KARST IDENTIFICATION AND INTERPRETATION IN WHITE RIVER NATIONAL FOREST“. In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-364629.
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Lyles, Alexander, und Marjorie Jerez. „A SEMI-AUTOMATED KARST FEATURE PREDICTION MODEL FOR THE WHITE RIVER NATIONAL FOREST, COLORADO BASED ON BARE-EARTH LIDAR IMAGERY“. In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-367316.
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Murray, Bridget. „SPRING CAVE, THEN AND NOW: EVALUATING VISITOR USE AND MANAGEMENT AT SPRING CAVE, WHITE RIVER NATIONAL FOREST, CO, THROUGH A HISTORIC FRAMEWORK“. In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-341183.
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Swanson, David. Tree investigations in the Noatak National Preserve, Alaska, 2011?2022: Old-growth and new forests. National Park Service, 2023. http://dx.doi.org/10.36967/2301700.
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Tree rings in the Noatak National Preserve provide information about the growth of trees at the cold limit of tree survival in northwestern North America. The present study was based on cores and other tree measurements (tree basal area, height, and number per unit area) of white spruce (Picea glauca) and balsam poplar (Populus balsamifera) trees taken from 39 permanent monitoring plots (34 with coreable trees) at three locations in the Preserve. The tree rings widths were measured and then normalized using a 50-year smoothing spline to remove the effects of growth variations through the life cycles of the trees. Old-growth white spruce forests, which here include numerous trees over 200 years old and some that are more than 300 years old, form open stands on well-drained slopes. Stands of younger trees that became established in the 1900s are present near elevational tree-line, and in small groves on tussock tundra. These younger stands are interpreted primarily as the result of forest expansion due to climate warming, though re-establishment of trees after wildfire is also possible in the tussock tundra. On river floodplains and terraces, stands of both white spruce and balsam poplar were also initiated in the 1900s, but here the youth of the trees is probably due to colonization of new areas exposed by river channel migration. Both the old-growth and younger forests showed continuing growth (as expressed by an increase in stand basal area) between our initial visit in 2011 and re-visit in 2021 or 2022, with the greatest increases occurring on floodplains. Tree rings showed much year-to-year variation in width, but the effect of individual cold summers was surprisingly weak. Some of the major global climate perturbations due to volcanic eruptions were visible in the tree ring record, but the resulting ring growth was generally no worse than other bad growth years within a few decades of the volcanic event. Tree ring width was statistically correlated more closely with the average warmth of several preceding growing seasons (as expressed by the annual sum of thaw degree-days) than with the current year?s or the previous year?s warmth alone. This is probably due to the cumulative effect of several years? warmth (or cold) on the conditions in the tree rooting zone, on the amount of foliage available for photosynthesis, and the level of stored reserves in the tree.
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Kalen, Nicholas. Bats of Colonial National Historical Park following white-nose syndrome. National Park Service, Mai 2023. http://dx.doi.org/10.36967/2299226.
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I conducted bat surveys at Colonial National Historical Park to assess the status of bat communities following potential impacts of white-nose syndrome (WNS) since its arrival in Virginia in 2009. This disease, caused by the fungus Pseudogymnoascus destructans, has severely reduced populations of several bat species in the eastern United States, threatening some with regional extirpation. In the East, most-affected species include the little brown bat (Myotis lucifugus), the federally-endangered northern long-eared bat (Myotis septentrionalis) and Indiana bat (Myotis sodalis) (USFWS 2007, USFWS 2022a), as well as the tricolored bat (Perimyotis subflavus), which has been proposed for endangered status (USFWS 2022b). I sampled sites in Yorktown and Jamestown Island with acoustic bat detectors from the spring of 2019 through the spring of 2021 and conducted capture surveys using mist nets in 2019 and 2021 to characterize seasonal occurrence of bat species with a focus on documenting WNS-imperiled species. Surveys also sought to document potential over-wintering of bats at COLO, especially northern long-eared bats, which occur year-round in the Coastal Plain of North Carolina. Acoustic results identified the presence of eleven bat species by echolocation calls: big brown bat (Eptesicus fuscus), eastern red bat (Lasiurus borealis), hoary bat (Lasiurus cinereus), silver-haired bat (Lasionycteris noctivagans), southeastern bat (Myotis austroriparius), little brown bat, northern long-eared bat, Indiana bat, evening bat (Nycticeius humeralis), tricolored bat, and Mexican free-tailed bat (Tadarida brasiliensis). Acoustic results included diagnostic echolocation calls of little brown, northern long-eared, and Indiana bats, however, presence should be interpreted with caution due to similarities of call structures among Myotis spp. bats. Capture surveys documented seven species: big brown, eastern red, hoary, silver-haired, southeastern, evening, and tricolored bats. To examine habitat associations of bat species, I used generalized linear mixed models of a selection of variable candidates: habitat type, distance to water, minimum nightly temperature, and nightly precipitation to predict summer activity by significant predictors. Activity of hoary, silver-haired, little brown, evening, tricolored, and Mexican free-tailed bats was highest in open habitats. Big brown bat and Indiana bat identifications were most associated with forest habitats. Eastern red bat activity was high in both forest and open sites. Southeastern bat activity was highest in wetland sites and was largely confined to these habitats. Northern long-eared bat activity was not significantly different among habitat types. To examine seasonality in bat species occurrence, I modeled acoustic activity in passes/night by Julian date using generalized additive models. Activity of big brown, eastern red, hoary, little brown, northern long-eared, tricolored, evening, and Mexican free-tailed bats was highest during summer. Silver-haired bat activity was highest in March indicative of seasonal migration. Hoary and Mexican free-tailed bat also exhibited high activity on several nights in the spring suggestive of migratory movement. Dormant season results suggest some winter occurrence for all identified bat species except Indiana bats. Very few characteristic calls of northern long-eared bats were observed from December through February, suggesting they winter locally in far lower abundances than in the Coastal Plain of North Carolina to the south.
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Sanders, Suzanne, und Jessica Kirschbaum. Forest health monitoring at Mississippi National River and Recreation Area: 2022 field season. National Park Service, 2023. http://dx.doi.org/10.36967/2301407.
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The Mississippi National River and Recreation area (MISS), situated along a 116 km stretch of the Mississippi River through the Minneapolis and St. Paul urban corridor, encompasses ~21,800 ha of public and private land. In 2022, the Great Lakes Inventory and Monitoring Network (GLKN) resampled permanent forest monitoring sites in the park, marking the second assessment of these sites, which were established and initially sampled in 2011. The goal of this long-term monitoring project is to provides managers with routine updates on which to base management decisions; these data can also be used to tease apart impacts and elucidate causal agents when novel problems or situations arise. We initiated a comprehensive forest monitoring program at MISS in 2011, establishing 33 sites at that time. High water levels during our sampling window that year precluded sampling on many of our planned sites while on others, water levels had only recently subsided. Here, the full complement of herbs had not yet emerged. In 2022, we resampled existing sites and established additional locations, bringing the total to 50. Sampled and derived metrics included trees (density and basal area of live trees, seedlings, and snags (i.e., standing dead trees)), understory (herb and shrub frequency), browse (bite marks on woody species and presence and height of herbaceous species), and taxa richness. We classified sites into four broad forest types using the newer (2022) dataset, resulting in two upland types (upland rich, upland disturbed) and two floodplain types (box elder-dominated and silver maple-dominated). Because of sampling difficulties in 2011, we are only comparing tree, sapling, and snag data between years. At upland rich sites, overall tree (? 2.5 cm diameter at breast height [DBH]) density declined 22%, while that for just the small sapling component (? 2.5 cm, < 5 cm DBH) fell 41%. Species experiencing notable losses include basswood (Tilia americana L.), elm (Ulmus L.), bitternut hickory (Carya cordiformis (Wangenh.) K. Koch), and red oak (Quercus rubra L.). All three resampled sites are located in Spring Lake Park Reserve and subjected to high white-tailed deer (Odocoileus virginianus Zimm.) browse pressure. We sampled seven sites in upland disturbed forests, where overall tree density fell 17% from 778 ? 215 trees/ha to 648 ? 72 trees/ha, largely due to declines in elm, ash (Fraxinus sp. L.), and hackberry (Celtis occidentalis L.). While changes in black cherry (Prunus serotina Ehrh.) mirrored this pattern in diameter classes above 5 cm, density of saplings increased 12-fold, largely due to a swamping effect from one site, possibly in response to buckthorn (Rhamnus cathartica L.) removal. In the nine box elder-dominated sites, overall tree density declined from 635 ? 47 in 2011 to 500 ? 58 trees/ha in 2022, mainly reflecting changes in box elder (Acer negundo L.), elm, and silver maple (Acer saccharinum L.). In these sites, density of large (? 30 cm DBH) snags increased from 2.5 ? 1.6 to 11.1 ? 4.4 snags/ha. In silver maple-dominated floodplain forests, tree density in the 12 sites fell from 421 ? 63 to 291 ? 23 trees/ha, with declines observed in all five dominant species. Sapling density was low in these sites, falling from 62.6 ? 36 in 2011 to 23.6 ? 11 saplings/ha in 2022. Our observations likely reflect both deer browse and alteration of the flow regime by river impoundment. At upland sites, deer browse is impeding regeneration of all major upland species: red oak, bitternut hickory, basswood, and elm. While browse is also occurring in floodplain sites, prolonged inundation may play a larger role in regeneration failure here. Saplings of silver maple, box elder, cottonwood, elm, and hackberry all have some degree of susceptibility to inundation, ranging from moderate tolerance to completely intolerant. The Mississippi River experienced flooding in 2014, 2017, and again in 2019 when flood stage was exceeded for a record number of days in St. Paul. Sapling decline at floodplain sites is likely a direct result of this. Forest management within the park should focus both on invasive species control and floodplain reforestation. Several sites with heavy invasive weed species are in areas where leveraging local volunteers for removal projects may be possible. Floodplain reforestation requires a dual approach of research and active management. Research is needed to determine preferred propagule types and planting stock, as well as the most effective ways to control invasives, especially reed canarygrass (Phalaris arundinacea L.). Active floodplain reforestation can alleviate many of the issues we found here, although this is expensive, limited in scope, and carries with it a great deal of uncertainty. Nonetheless, projects undertaken at a small scale can provide lessons to managers, based on which aspects were successful and which were not. Many of the park forests at MISS are nearing an inflection point and are at risk of becoming irreversibly altered if countermeasures are not undertaken in the near future. At this point, steps taken to promote ecosystem integrity are likely to be less costly and more effective than those which may be needed after further ecosystem decline. The river system through the Twin Cities metro area provides numerous services, both ecological and otherwise. As the need to act is becoming a pressing issue, it is incumbent on land managers to recognize this, and address it.
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Wood, Robert H., David A. Bird und Matthew A. Sares. OF-05-01 Mine Site History and Watershed Characterization of the Cinnamon Gulch Area, Dillon Ranger District, White River National Forest, Summit County, Colorado. Colorado Geological Survey, 2005. http://dx.doi.org/10.58783/cgs.of0501.yvro3555.
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Mineral resource potential and geology of the White River National Forest and the Dillon Ranger District of the Arapaho National Forest, Colorado, with a section on salable commodities. US Geological Survey, 1993. http://dx.doi.org/10.3133/b2035.
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