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Articles 1051 - 1080 of 1564
Full-Text Articles in Earth Sciences
Biology Of Nematodes In Desert Ecosystems, R. Mankau
Demography Of Termite Colonies As Related To Various Environmental Factors: Nutritional Biochemistry And Physiology Of Termites, W. L. Nutting, J. P. Lafage
Demography Of Termite Colonies As Related To Various Environmental Factors: Nutritional Biochemistry And Physiology Of Termites, W. L. Nutting, J. P. Lafage
Memorandum
No abstract provided.
Seed-Eating Birds, H. R. Pulliam
Demography Of Termite Colonies As Related To Various Environmental Factors: Nutritional Biochemistry And Physiology Of Termites, W. L. Nutting, J. P. Lafage
Demography Of Termite Colonies As Related To Various Environmental Factors: Nutritional Biochemistry And Physiology Of Termites, W. L. Nutting, J. P. Lafage
Memorandum
No abstract provided.
Plant Food Habits Of Rodents In Curlew Valley, E. L. Becker Ii, D. F. Balph, M. H. Balph
Plant Food Habits Of Rodents In Curlew Valley, E. L. Becker Ii, D. F. Balph, M. H. Balph
Memorandum
No abstract provided.
Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman
Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman
Memorandum
No abstract provided.
Rodent Seed-Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown, D. W. Davidson
Rodent Seed-Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown, D. W. Davidson
Memorandum
No abstract provided.
Responses And Interactions In Desert Plants As Influenced By Irrigation And Nitrogen Application, R. B. Hunter, E. M. Romney, A. Wallace, J. E. Kinnear, T. L. Ackerman, H. O. Hill
Responses And Interactions In Desert Plants As Influenced By Irrigation And Nitrogen Application, R. B. Hunter, E. M. Romney, A. Wallace, J. E. Kinnear, T. L. Ackerman, H. O. Hill
Memorandum
No abstract provided.
Primary Production And Carbon Allocation In Creosotebush: Validation Of The Model, G. L. Cunningham, J. F. Reynolds
Primary Production And Carbon Allocation In Creosotebush: Validation Of The Model, G. L. Cunningham, J. F. Reynolds
Memorandum
No abstract provided.
Jornada Validation Site Report, W. G. Whitford
Tucson Basin Validation Site Report, J. L. Thames
Rock Valley Validation Site Report, F. B. Turner
Impact Of Grazing On Foothill Vegetation, K. C. Hodgkinson, P. S. Johnson
Impact Of Grazing On Foothill Vegetation, K. C. Hodgkinson, P. S. Johnson
Memorandum
No abstract provided.
User's Manual For Desert2: A Desert Ecosystem Simulator Written In Ansi Fortran Iv, W. D. Valentine
User's Manual For Desert2: A Desert Ecosystem Simulator Written In Ansi Fortran Iv, W. D. Valentine
Memorandum
No abstract provided.
Monroe, Utah,Hydrothermal System: Results From Drilling O F Test Wells Mc 1 And Mc 2, D. S. Chapman, Roger Harrison
Monroe, Utah,Hydrothermal System: Results From Drilling O F Test Wells Mc 1 And Mc 2, D. S. Chapman, Roger Harrison
All U.S. Government Documents (Utah Regional Depository)
Following detailed geological (Parry et al., 1976; Miller, 1976) and geophysical (Mase, Chapman, and Ward, 1978; Kilty, Mase, and Chapman, 1978) studies of the Monroe, Utah hydrothermal system, a program of drilling two intermediate depth test wells was undertaken. The objectives of the test well drilling were three-fold: (1) to obtain structural information bearing on the poorly know dip of the Sevier Fault, (2) to obtain temperature information below the shallow depths (approximately 300 ft.) sampled in the first phase of exploration, and (3) to provide cased wells during the production phase of the project. The test well drilling was …
Thermal Waters Of Utah, Topical Report, Harry D. Goode
Thermal Waters Of Utah, Topical Report, Harry D. Goode
All U.S. Government Documents (Utah Regional Depository)
Western and central Utah has 16 areas whose wells or springs yield hot water (35 degrees C or higher), warm water (20 degrees - 34.5 degrees C), and slightly warm water (15.5 degrees - 19.5 degrees C). These areas and the highest recorded water temperature for each area: Lower Bear River Area, 105 degrees; Bonneville Salt Flats, 88 degrees; Cove Fort - Sulphurdale, 77 degrees; Curlew Valley, 43 degrees; East Shore Area, 60 degrees; Escalante Desert, 149 degrees; Escalante Valley (Roosevelt, 269 degrees, and Thermo, 85 degrees); Fish Springs, 60.5 degrees; Grouse Creek Valley, 42 degrees; Heber Valley (Midway, 45 …
Surficial Deposits And Geologic History, Northern Bear Lake Valley, Idaho, George C. Robertson Iii
Surficial Deposits And Geologic History, Northern Bear Lake Valley, Idaho, George C. Robertson Iii
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Detailed geologic mapping and subsurface study of late Pleistocene and Holocene sediments in northern Bear Lake Valley show at least four episodes of deposition of fluvial, marsh, bay, and lacustrine sediments. from oldest to youngest, these are the Ovid, Liberty, Wardboro, and Lifton episodes. These episodes are substantially different than those proposed by previous investigators. The informal term Bear Lake Formation is formally redefined here as the Bear Lake Group, and includes the newly defined Ovid Formation, Liberty Formation, Lanark Formation, and Rainbow Gravel. The overlying Wardboro Loess, also defined here, provides a probably age of 11,000 to 8,000 years …
Autecology Of Selected Genera Of Mississippian, Permian And Triassic Ammonoids: Analysis Of Coiling Geometries, Edward Ellis Chatelain
Autecology Of Selected Genera Of Mississippian, Permian And Triassic Ammonoids: Analysis Of Coiling Geometries, Edward Ellis Chatelain
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Ammonoids were collected from the Chainman Formation (Mississippian) of southeastern Nevada and southwestern Utah, the Phosphoria Formation (Permian) of southeastern Idaho and westernmost Wyoming, and the Thaynes Formation (Triassic) of northeastern Nevada and southeastern Idaho. The collections are interpreted to represent unwinnowed, untransported death assemblages of ammonoids which were subject to chemical conditions of the nekto-benthic environment. Associated lithologies were sampled and geochemically analyzed for content of phosphate and organic matter. Ammonoid fossil collections, combined with ammonoids illustrated in the literature, were subjected to the graphical W and D analysis of Raup (1967). The basic parameters involved in the description …
Hydrothermal Alteration At The Roosevelt Hot Springs Thermal Area, Utah: Petrographic Characterization Of The Alteration To 2 Kilometers Depth, J. M. Ballantyne, W. T. Parry
Hydrothermal Alteration At The Roosevelt Hot Springs Thermal Area, Utah: Petrographic Characterization Of The Alteration To 2 Kilometers Depth, J. M. Ballantyne, W. T. Parry
All U.S. Government Documents (Utah Regional Depository)
Hydrothermal alteration in drill cuttings from Thermal Power drillhole 14-2, Roosevelt Hot Springs Thermal area, has been studied petrographically. The hole is sited in alluvium approximately 1.6 km southeast of the old Resort and was rotary drilled to a depth of 1866.0 m. The exact hole location is 2310 FNL, 350 FWL, Sec. 2, Twp 27S, Rge 9W, elevation 1908.5 m. Core was extracted from 792.5 to 795.5 m. Thin sections were made from samples 15.2 m intervals of drill cuttings collected at 1.5 or 3.0 m intervals during drilling. Thin sections were made of 1.5 or 3.0 m intervals …
Alternatives For Ecosystem Classification And Their Use In Developing Rangeland Inventory And Management Planning Approaches, Neil E. West
Alternatives For Ecosystem Classification And Their Use In Developing Rangeland Inventory And Management Planning Approaches, Neil E. West
Memorandum
No abstract provided.
Grazing On National Forest System Lands: Cost Of Increasing Capacity In The Northern Region, United States Department Of Agriculture, Forest Service
Grazing On National Forest System Lands: Cost Of Increasing Capacity In The Northern Region, United States Department Of Agriculture, Forest Service
Forestry
Sample grazing allotments on Ranger Districts in the Northern Region (USDA Forest Service) were surveyed by questionaire to determine the feasibility of increasing grazing capacity through additional range improvements. The survey included an inventory of existing grazing capacity and the specific kind and cost of proposed improvements. Costs of improvements were amortized and aggregated for each Forest Service Planning Area. The resulting costs were compared with the increased grazing capacity measured in animal unit months (AUM) to determine the cost per additional unit of capacity.
Quaternary Rhyolite From The Mineral Mountains, Utah, U.S.A., S. H. Evans, Jr., W. P. Nash, University Of Utah, Department Of Geology And Geophysics
Quaternary Rhyolite From The Mineral Mountains, Utah, U.S.A., S. H. Evans, Jr., W. P. Nash, University Of Utah, Department Of Geology And Geophysics
All U.S. Government Documents (Utah Regional Depository)
A suite of silicic volcanic rocks is associated with the Roosevelt Hot Springs geothermal area in southwestern Utah. The volcanic sequence includes Tertiary rhyolite 8 m.y. old and obsidian, ash and rhyolite of Quaternary age. The Quaternary lavas are characterized by high silica content (76.5% SiO2) and total alkalies in excess of 9 percent. Obsidians commonly contain greater amounts of flourine than water. Two older flows (0.8 m.y.) can be distinguished from younger dome and pyroclastic material (approximately 0.5 m.y.) by subtle differences in their chemistry. The mineralogy of the rhyolites consists of alkali feldspar, plagioclase, and small amounts of …
Low-Cost Harvesting Systems For Intensive Utilization In Small-Stem Lodgepole Pine Stands, United States Department Of Agriculture, Forest Service
Low-Cost Harvesting Systems For Intensive Utilization In Small-Stem Lodgepole Pine Stands, United States Department Of Agriculture, Forest Service
Forestry
The study reported here had two objectives: (1) examine the feasibility of using inexpensive skidding equipment in a small-stem lodgepole pine stand in western Montana, and (2) determine forest residues volumes (unused wood) resulting from different ground skidding methods and utilization standards. Preharvest volumes, volumes removed, residues left on the ground, and unusable material hauled from the site were determined for various utilization standards. The efficiency of skidding with a horse, small tractor, and small rubber-tired skidder were compared.
Timelag And Equililbrium Moisture Content Of Ponderosa Pine Needles, United States Department Of Agriculture, Forest Service
Timelag And Equililbrium Moisture Content Of Ponderosa Pine Needles, United States Department Of Agriculture, Forest Service
Forestry
The ponderosa pine (Pinus ponderosa Laws.) timber type covers nearly 9 million acres in the Rocky Mountains. The needle litter cast by these trees produces a highly flammable fuel when conditions are dry. The capability for fires to start and spread depends largely on the moisture content of surface fuels and their response to environmental changes. This report summarizes the results of laboratory tests to determine equilibrium moisture contents and absorption-desorption timelags below fiber saturation of ponderosa pine needles. Conducting the tests at conditions below fiber saturation eliminated consideration of the movement of free water and possible leaching of the …
Predicting Slash Depth For Fire Modeling, United States Department Of Agriculture, Forest Service
Predicting Slash Depth For Fire Modeling, United States Department Of Agriculture, Forest Service
Forestry
Slash or debris created by harvesting and thinning are a major fire management problem because these residues can create unacceptable fire behavior hazards. Treating slash to maintain an acceptable fire hazard is expensive and requires skillful decisionmaking. An inexpensive, simple-to-use, yet objective means of appraising the potential fire behavior of slash is added to aid decisions in managing slash. Knowledge of potential fire behavior can help determine treatment alternatives, the financing of slash treatment activities, and even determine whether the slash should be created. This report describes a method for predicting depth of slash fuels for analytical modeling of fire …
Effects Of Burning Moist Fuels On Seedbed Preparation In Cutover Western Larch Forests, United States Department Of Agriculture, Forest Service
Effects Of Burning Moist Fuels On Seedbed Preparation In Cutover Western Larch Forests, United States Department Of Agriculture, Forest Service
Forestry
Natural seeding is normally the preferred method of regenerating conifers in the Northern Rocky Mountains (Schmidt and Shearer 1973). Some seedbed preparation is usually necessary for successful natural regeneration. Shade intolerant species such as western larch (Larix occidentalis Nutt.) regenerate best on bare mineral soil.
Converting Forest Residue To Structural Flakeboard - The Fingerling Concept, United States Department Of Agriculture, Forest Service
Converting Forest Residue To Structural Flakeboard - The Fingerling Concept, United States Department Of Agriculture, Forest Service
Forestry
Structural-grade flakeboard experimentally manufactured from forest residues showed mean strengths above 5,500 psi and stiffness (MOE) above 600,000 psi. For economical transport, residues are chipped into "fingerlings" in the woods. Chipping rates are estimated at 50 tons per hour for large residues, and 15 tons per hour for small residues -- using different machines. Depending on the harvesting system selected, estimated costs of fingerlings delivered to the mill range from $25 to $33 per bone-dry ton for systems other than cable yarders.
A Hydrologic Model Of Aspen-Conifer Succession In The Western United States, United States Department Of Agriculture, Forest Service
A Hydrologic Model Of Aspen-Conifer Succession In The Western United States, United States Department Of Agriculture, Forest Service
Forestry
Hydrologic impacts of grass-forb to aspen to conifer succession in the Rocky Mountain area are simulated by means of a fundamental model. Model algorithms representing hydrologic processes are sensitive to vegetational changes within the subalpine vegetation zone. Reductions in water yield are predicted as the vegetation on a small Utah watershed proceeds from a grass-forb type to aspen to conifers. Streamflow changes are largely attributable to an interaction between seasonal consumption for each vegetation type and the influence of vegetation type on snowpack. The model synthesizes present understanding and provides a framework for future watershed research.
Weight And Density Of Crowns Of Rocky Mountain Conifers, United States Department Of Agriculture, Forest Service
Weight And Density Of Crowns Of Rocky Mountain Conifers, United States Department Of Agriculture, Forest Service
Forestry
Relationships between live and dead crown weight and d.b.h. (ranging from 0 to 40 inches), tree height, and crown ratio are presented for 11 conifer species in the Rocky Mountains. D.b.h. was highly correlated with crown weight; however, for most species, addition of height, crown length, and especially crown ratio improved precision. Site index and stand density improved precision of estimates slightly for about one-half of the species. Crown ratio accounted for most of the differences in crown weight between dominant and intermediate crown classes. Relationships between bole weights and d.b.h. and height are presented for trees up to 4 …
Effect Of Growing Season On Sprouting Of Blue Huckleberry, United States Department Of Agriculture, Forest Service
Effect Of Growing Season On Sprouting Of Blue Huckleberry, United States Department Of Agriculture, Forest Service
Forestry
Vaccinium globulare, blue huckleberry, was clipped on five dates from May 19 to August 4. All clipping treatments caused more lateral bud release than occurred in control plants. May, June, and early July treatments caused the same amount of dormant bud release. The amount of shoot growth from released buds corresponded to the amount of growing season remaining after treatment. Irregularity between plants in shoot development after the July 8 treatment and the lack of bud development after the August 4 treatment are attributed to the onset of seasonal bud dormancy.