Filters: Tags: Canyonlands National Park (X) > Extensions: Citation (X)
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Invasions of the annual species cheatgrass (Bromus tectorum) in North American ecosystems present a threat to the population viability of native plant and animal species. In the interest of curtailing B. tectorum success, we manipulated the biogeochemistry of Canyonlands National Park soils in greenhouse and germination experiments. We compared growth parameters of B. tectorum and a native perennial, Hilaria jamesii, in greenhouse experiments utilizing 10 soil additives. Biomass of B. tectorum growing in conjuction with H. jamesii was greater than that growing in monocultures, suggesting facilitation of Bromus growth by H. jamesii. The opposite trend was true for H. jamesii, indicating that Bromus inhibits H. jamesii...
In this study, we examined N gas loss as nitric oxide (NO) from N-fixing biologically crusted soils in Canyonlands National Park, Utah. We hypothesized that NO gas loss would increase with increasing N fixation potential of the biologically crusted soil. NO fluxes were measured from biologically crusted soils with three levels of N fixation potential (Scytonema-Nostoc-Collema spp. (dark)>Scytonema-Nostoc-Microcoleus spp. (medium)>Microcoleus spp. (light)) from soil cores and field chambers. In both cores and field chambers there was a significant effect of crust type on NO fluxes, but this was highly dependent on season. NO fluxes from field chambers increased with increasing N fixation potential of the biologically...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Biogeochemistry,
Canyonlands National Park,
Colorado Plateau,
Nitric oxide,
Nitrogen fixation,
The structural stabilization of seven prehistoric ruins in Canyonlands National Park and Natural Bridges National Monument, credited to Gaunt, Joan K, published in 1985.
Categories: Publication;
Types: Citation,
ScienceBase Citation;
Tags: Canyonlands National Park,
archaeology,
excavations
During January-March of 1990 a study was conducted to determine the sources of sulfur oxides present at Canyonlands and Green River, Utah. Samples were collected at these two receptor sites and at several sites intended to characterize the chemical composition of air masses reaching the receptor sites from various geographical regions. The results of the sampling program have been given in the first paper in a series of three papers. In this paper, the concentrations of spherical aluminosilicate (SAS) particles, total fluoride, and particulate selenium, arsenic and lead are combined with meteorological data to obtain source fingerprints for the ratios of these species to SOx from the various regional sources that...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atmospheric Environment,
Canyonlands National Park,
desert aerosols,
fine particle composition,
source apportionment,
This document is the final technical report of a cultural resources inventory and limited testing project in the Squaw Butte Area, Needles District, Canyonlands National Park, Utah. This project was conducted as part of a multiyear cultural resource program conducted by P-III Associates, Inc., on behalf of the National Park Service, Rocky Mountain Regional Office. The purposes of this multiyear effort are to provide management, scientific, and interpretive information on the prehistory of the park. Published by National Park Service, Rocky Mountain Regional Office, in 1995.
We investigated several forms of phosphorus (P) in dryland soils to examine the chemical and textural controls on P stabilization on a diverse set of substrates. We examined three P fractions including labile, moderately labile, and occluded as determined by a modified Hedley fractionation technique. The P fractions were compared to texture measurements and total elemental concentrations determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Labile P related to the absence of materials involved in P sorption. Moderately labile P was most strongly associated with high total Al & Fe content that we interpret to represent oxides and 1:1 clay minerals. The occluded P fraction was strongly associated...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Biogeochemistry,
Canyonlands National Park,
Hedley fractions,
P stabilization,
Springer Netherlands,
In this study, we conducted rainfall simulation experiments in a cool desert ecosystem to examine the role of biological soil crust disturbance and composition on dissolved and sediment C and N losses. We compared runoff and sediment C and N losses from intact late-successional dark cyanolichen crusts (intact) to both trampled dark crusts (trampled) and dark crusts where the top 1 cm of the soil surface was removed (scraped). In a second experiment, we compared C and N losses in runoff and sediments in early-successional light cyanobacterial crusts (light) to that of intact late-successional dark cyanolichen crusts (dark). A relatively high rainfall intensity of approximately 38 mm per 10-min period was used to...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Biogeochemistry,
Canyonlands National Park,
Carbon,
Colorado Plateau,
Rainfall simulation,
Considers S. 26, to expand the boundaries of Canyonlands National Park in southeastern Utah. Considers (90) S. 26. Published by U.S. G.P.O., in 1968.
In this study, we examined N gas loss as nitric oxide (NO) from N-fixing biologically crusted soils in Canyonlands National Park, Utah. We hypothesized that NO gas loss would increase with increasing N fixation potential of the biologically crusted soil. NO fluxes were measured from biologically crusted soils with three levels of N fixation potential (Scytonema-Nostoc-Collema spp. (dark)>Scytonema-Nostoc-Microcoleus spp. (medium)>Microcoleus spp. (light)) from soil cores and field chambers. In both cores and field chambers there was a significant effect of crust type on NO fluxes, but this was highly dependent on season. NO fluxes from field chambers increased with increasing N fixation potential of the biologically...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Biogeochemistry,
Canyonlands National Park,
Colorado Plateau,
Nitric oxide,
Nitrogen fixation,
Anthropogenic activity is causing dramatic changes in the nitrogen (N) cycle in many ecosystems. Most research has focused on the increase in N input caused by atmospheric deposition and invasion of N-fixing species, and on their effects on resource availability and species composition. However, in contrast to many ecosystems experiencing large increases in N input, many arid ecosystems are experiencing loss of nutrients due to land-use change. An important component of many arid ecosystems on a worldwide basis is the microbiotic crust, a biological soil crust composed of lichens, cyanobacteria, mosses, and algae. Nitrogen fixation by lichens and cyanobacteria comprising the crust is the primary source of N input...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Canyonlands National Park,
Ecology,
Utah,
cryptogamic crusts,
land-use change,
During January-March of 1990 a study was conducted to determine the sources of sulfur oxides present at Canyonlands and Green River, Utah. Samples were collected at these two receptor sites and at several sites intended to characterize the chemical composition of air masses reaching the receptor sites from various geographical regions. The results of the sampling program have been given in the first paper in a series of three papers. In this paper, the concentrations of spherical aluminosilicate (SAS) particles, total fluoride, and particulate selenium, arsenic and lead are combined with meteorological data to obtain source fingerprints for the ratios of these species to SOx from the various regional sources that...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atmospheric Environment,
Canyonlands National Park,
apportionment of sulfate,
apportionment of sulfur oxides,
chemical mass balance,
Field and microstructural observations from Upheaval Dome, in Canyonlands National Park, Utah, show that inelastic strain of the Wingate Sandstone is localized along compactional deformation bands. These bands are tabular discontinuities (b0.5 cm thick) that accommodate inelastic shear and compaction of inter-granular volume. Measurements of porosity and grain size from nondeformed samples are used to define a set of capped strength envelopes for the Wingate Sandstone. These strength envelopes reveal that compactional deformation bands require at least ca. 0.7 GPa (and potentially more than 2.3 GPa) of effective mean stress in order to nucleate within this sandstone. We find that the most plausible geologic process...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Canyonlands National Park,
Earth and Planetary Science Letters,
Upheaval Dome,
Wingate Sandstone,
deformation band,
The introduction of nonnative plant species may decrease ecosystem stability by altering the availability of nitrogen (N) for plant growth. Invasive species can impact N availability by changing litter quantity and quality, rates of N2-fixation, or rates of N loss. We quantified the effects of invasion by the annual grass Bromus tectorum on N cycling in an arid grassland on the Colorado Plateau (USA). The invasion occurred in 1994 in two community types in an undisturbed grassland. This natural experiment allowed us to measure the immediate responses following invasion without the confounding effects of previous disturbance. Litter biomass and the C:N and lignin:N ratios were measured to determine the effects on...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Bromus tectorum,
Canyonlands National Park,
Ecological Applications,
N mineralization,
Utah,
The introduction of nonnative plant species may decrease ecosystem stability by altering the availability of nitrogen (N) for plant growth. Invasive species can impact N availability by changing litter quantity and quality, rates of N2-fixation, or rates of N loss. We quantified the effects of invasion by the annual grass Bromus tectorum on N cycling in an arid grassland on the Colorado Plateau (USA). The invasion occurred in 1994 in two community types in an undisturbed grassland. This natural experiment allowed us to measure the immediate responses following invasion without the confounding effects of previous disturbance. Litter biomass and the C:N and lignin:N ratios were measured to determine the effects on...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Bromus tectorum,
Canyonlands National Park,
Ecological Applications,
N mineralization,
Utah,
Salt Creek is the largest drainage in the Needles district of Canyonlands National Park. The creek supports one of the most important riparian ecosystems in the park. It is also the heart of the Salt Creek National Register Archeological District, the area with the highest recorded density of archeological sites in the park. A tributary canyon contains the spectacular Angel Arch, a well-known geologic formation that for many years has been a destination point for park visitors. In 1998 the U.S. District Court for the State of Utah ruled, in a lawsuit filed by the Southern Utah Wilderness Alliance, that the National Park Service violated the NPS Organic Act (16 U.S.C. 1 et seq.) by failing to close the upper 8.2...
The White Rim Sandstone Member of the Permian Cutler Formation in Canyonlands National Park, southeastern Utah, was deposited in a coastal eolian environment. The White Rim consists of three types of eolian deposits: dune, interdune, and sabkha. Characteristics of the dune deposits are large-to medium-scale, unidirectional, tabular planar crossbed sets; high-index ripples oriented parallel to the dip direction of the foresets; inverse graded laminations formed by ripple migration; sand-flow toes; and raindrop impressions. Interdune deposits are of two types, erosional and depositional, formed under varying degrees of wetness. Erosional interdune deposits are characterized by thin, coarse sand to granule size, bimodal...
Categories: Publication;
Types: Citation,
ScienceBase Citation;
Tags: Canyonlands National Park,
Geology,
Permian,
Sandstone,
Stratigraphic,
During January-March of 1990 a study was conducted to determine the sources of sulfur oxides present at Canyonlands and Green River, Utah. Samples were collected at these two receptor sites and at several sites intended to characterize the chemical composition of air masses reaching the receptor sites from various geographical regions. The results of the sampling program have been given in the first paper in a series of three papers. In this paper, the concentrations of spherical aluminosilicate (SAS) particles, total fluoride, and particulate selenium, arsenic and lead are combined with meteorological data to obtain source fingerprints for the ratios of these species to SOx from the various regional sources that...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atmospheric Environment,
Canyonlands National Park,
endemic tracers of sulfur oxides,
meteorology,
regional source fingerprints,
Advances in data capture and computer technology have made possible the collection of three-dimensional, high-resolution, digital geological data from outcrop analogs. This paper presents new methodologies for the acquisition and utilization of three-dimensional information generated by ground-based laser scanning (lidar) of outcrops. A complete workflow is documented—from outcrop selection through data collection, processing and building of virtual outcrops—to geological interpretation and the building of geocellular models using an industry-standard, reservoir-modeling software. Data sets from the Roda Sandstone in the Spanish Pyrenees and the Grabens region of Canyon-lands National Park, Utah, USA, are used...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Canyonlands National Park,
Geosphere,
Pyrenees,
analog simulation,
clinoforms,
During January-March of 1990 a study was conducted to determine the sources of sulfur oxides present at Canyonlands and Green River, Utah. Samples were collected at these two receptor sites and at several sites intended to characterize the chemical composition of air masses reaching the receptor sites from various geographical regions. The results of the sampling program have been given in the first paper in a series of three papers. In this paper, the concentrations of spherical aluminosilicate (SAS) particles, total fluoride, and particulate selenium, arsenic and lead are combined with meteorological data to obtain source fingerprints for the ratios of these species to SOx from the various regional sources that...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atmospheric Environment,
Canyonlands National Park,
apportionment of sulfate,
apportionment of sulfur oxides,
chemical mass balance,
During January-March of 1990 a study was conducted to determine the sources of sulfur oxides present at Canyonlands and Green River, Utah. Samples were collected at these two receptor sites and at several sites intended to characterize the chemical composition of air masses reaching the receptor sites from various geographical regions. The results of the sampling program have been given in the first paper in a series of three papers. In this paper, the concentrations of spherical aluminosilicate (SAS) particles, total fluoride, and particulate selenium, arsenic and lead are combined with meteorological data to obtain source fingerprints for the ratios of these species to SOx from the various regional sources that...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atmospheric Environment,
Canyonlands National Park,
apportionment of sulfate,
apportionment of sulfur oxides,
chemical mass balance,
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