Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Geology (29999)
- Life Sciences (14809)
- Soil Science (14405)
- Plant Sciences (11784)
- Agronomy and Crop Sciences (10418)
-
- Weed Science (9711)
- Agricultural Science (9568)
- Plant Biology (9394)
- Plant Pathology (9308)
- Environmental Sciences (9267)
- Hydrology (5282)
- Engineering (3888)
- Oceanography and Atmospheric Sciences and Meteorology (3334)
- Sustainability (2633)
- Water Resource Management (2544)
- Geophysics and Seismology (2469)
- Geomorphology (2255)
- Oil, Gas, and Energy (2083)
- Mining Engineering (1943)
- Sedimentology (1930)
- Environmental Monitoring (1778)
- Natural Resources Management and Policy (1663)
- Other Earth Sciences (1658)
- Paleontology (1635)
- Social and Behavioral Sciences (1630)
- Stratigraphy (1555)
- Geochemistry (1541)
- Other Environmental Sciences (1366)
- Institution
-
- Western Michigan University (19480)
- University of Kentucky (10981)
- University of Nebraska - Lincoln (4541)
- University of South Florida (1883)
- China Coal Technology and Engineering Group (CCTEG) (1822)
-
- Department of Primary Industries and Regional Development, Western Australia (1674)
- Utah State University (1565)
- TÜBİTAK (917)
- Missouri University of Science and Technology (782)
- University of Arkansas, Fayetteville (772)
- Portland State University (671)
- Boise State University (667)
- Old Dominion University (664)
- University of Nevada, Las Vegas (521)
- University of Texas Rio Grande Valley (520)
- Montana Tech Library (496)
- Western Kentucky University (496)
- University of Colorado Law School (481)
- University of North Dakota (448)
- Louisiana State University (427)
- University of New Mexico (402)
- Montclair State University (387)
- Central Washington University (368)
- City University of New York (CUNY) (315)
- University of Texas at El Paso (315)
- University of South Carolina (281)
- Michigan Technological University (254)
- Brigham Young University (240)
- University of Texas at Arlington (237)
- University of New Hampshire (230)
- Keyword
-
- Western Australia (1183)
- Geology (902)
- Grains and field crops (625)
- Groundwater (623)
- Nebraska (589)
-
- Climate change (466)
- Grazing (407)
- Geochemistry (403)
- Soil (373)
- Hydrology (359)
- Montana (326)
- Nitrogen (323)
- Kentucky (302)
- Remote sensing (285)
- Water quality (283)
- Salinity (282)
- Drought (277)
- Utah (272)
- Water (240)
- Karst (234)
- Geophysics (228)
- Alfalfa (223)
- Climate (220)
- Hydrogeology (215)
- Phosphorus (213)
- Geomorphology (205)
- Stratigraphy (205)
- Agriculture (204)
- Irrigation (202)
- United States (191)
- Publication Year
- Publication
-
- Legacy Scout Tickets from Pure Oil Company (11044)
- IGC Proceedings (1977-2023) (9261)
- Thin Sections (6677)
- Coal Geology & Exploration (1822)
- Legacy Color Lithology Strip Logs (1152)
-
- United States Geological Survey: Staff Publications (1026)
- Turkish Journal of Earth Sciences (917)
- Conservation and Survey Division: Faculty and Staff Publications (901)
- International Journal of Speleology (892)
- Theses and Dissertations (835)
- Department of Earth and Atmospheric Sciences: Faculty Publications (673)
- Experimental Summaries - Plant Research (668)
- Masters Theses (591)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (454)
- School of Earth, Environmental, & Marine Sciences Faculty Publications (429)
- Bachelors Theses and Reports, 1928 - 1970 (423)
- Geosciences Faculty Publications and Presentations (402)
- Faculty Publications (385)
- Kentucky Alfalfa and Stored Forage Conference (382)
- School of Geosciences Faculty and Staff Publications (355)
- Dissertations and Theses (343)
- Earth and Planetary Sciences ETDs (343)
- Graduate Theses and Dissertations (339)
- Electronic Theses and Dissertations (325)
- Memorandum (316)
- Resource management technical reports (315)
- Open Access Theses & Dissertations (294)
- Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works (280)
- USF Tampa Graduate Theses and Dissertations (272)
- Department of Earth and Environmental Studies Faculty Scholarship and Creative Works (266)
- Publication Type
Articles 12781 - 12810 of 59559
Full-Text Articles in Earth Sciences
Mgrre_Thinsections_Mgrre-58_51, Mgrre
Mgrre_Thinsections_Mgrre-58_74, Mgrre
Mgrre_Thinsections_Mgrre-58_94, Mgrre
Mgrre_Thinsections_Mgrre-58_97, Mgrre
Mgrre_Thinsections_Mgrre-63_1, Mgrre
Mgrre_Thinsections_Mgrre-67_3, Mgrre
Mgrre_Thinsections_Mgrre-58_42, Mgrre
Mgrre_Thinsections_Mgrre-47_23, Mgrre
Mgrre_Thinsections_Mgrre-47_12, Mgrre
Mgrre_Thinsections_Mgrre-41_10, Mgrre
Mgrre_Thinsections_Mgrre-43_11, Mgrre
Mgrre_Thinsections_Mgrre-44_10, Mgrre
Mgrre_Thinsections_Mgrre-44_14, Mgrre
Mgrre_Thinsections_Mgrre-45_29, Mgrre
Mgrre_Thinsections_Mgrre-45_35, Mgrre
Mgrre_Thinsections_Mgrre-46_61, Mgrre
Using Stable Isotope Analyses To Assess The Trophic Ecology Of Scleractinian Corals, Michael P. Lesser, Marc Slattery, Keir J. Macartney
Using Stable Isotope Analyses To Assess The Trophic Ecology Of Scleractinian Corals, Michael P. Lesser, Marc Slattery, Keir J. Macartney
School of Earth, Environmental, & Marine Sciences Faculty Publications
Studies on the trophic ecology of scleractinian corals often include stable isotope analyses of tissue and symbiont carbon and nitrogen. These approaches have provided critical insights into the trophic sources and sinks that are essential to understanding larger-scale carbon and nitrogen budgets on coral reefs. While stable isotopes have identified most shallow water (<30 m) corals as mixotrophic, with variable dependencies on autotrophic versus heterotrophic resources, corals in the mesophotic zone (~30–150 m) transition to heterotrophy with increasing depth because of decreased photosynthetic productivity. Recently, these interpretations of the stable isotope data to distinguish between autotrophy and heterotrophy have been criticized because they are confounded by increased nutrients, reverse translocation of photosynthate, and changes in irradiance that do not influence photosynthate translocation. Here we critically examine the studies that support these criticisms and show that they are contextually not relevant to interpreting the transition to heterotrophy in corals from shallow to mesophotic depths. Additionally, new data and a re-analysis of previously published data show that additional information (e.g., skeletal isotopic analysis) improves the interpretation of bulk stable isotope data in determining when a transition from primary dependence on autotrophy to heterotrophy occurs in scleractinian corals.
Mgrre_Thinsections_05_A_83, Mgrre
Mgrre_Thinsections_05_A_82, Mgrre
The Impact Of Contact Geometry On Sea Ice Stress And Fracture At The Scale Of Ice Floes, Michael J. May
The Impact Of Contact Geometry On Sea Ice Stress And Fracture At The Scale Of Ice Floes, Michael J. May
Dartmouth College Master’s Theses
Observations of stress and strain at the scale of ice floes are necessary to fill a gap in our understanding of sea ice mechanical behavior. Current climate and ice dynamics models represent ice mechanical properties using stress-strain relationships largely determined at laboratory-scale (<1m) or from regional-scale (10+km) deformation observations. The former scale does not include all mechanisms of deformation operating in the ice pack; the latter aggregates multiple modes of deformation into non-physical fluid analogies. The Sea Ice Dynamics Experiment (SIDEx) was run in Feb-Mar 2021 to fill this gap, observing stress and strain at the scale of sea ice failure processes. Here we present stress sensor observations. Stress gages (N=31) were deployed over a 4.5km2 area in the southern Beaufort Sea to observe in-situ stress. These data were analyzed in the context of deformation observations from satellite imagery and local laser and radar interferometers to explain the drivers of sea ice stress variations before and after fracture. Three case studies between 14 March and 24 March, during which fractures propagated through …
Effects Of Sowing Date And Phosphorus Fertiliser Application On Winter Survival Of Lucerne Cv. Aohan In The Northern Semi-Arid Region Of China, Z. L. Wang, Q. Zh. Sun, Y. W. Wang, Zh. Y. Li, Sh. F. Zhao
Effects Of Sowing Date And Phosphorus Fertiliser Application On Winter Survival Of Lucerne Cv. Aohan In The Northern Semi-Arid Region Of China, Z. L. Wang, Q. Zh. Sun, Y. W. Wang, Zh. Y. Li, Sh. F. Zhao
IGC Proceedings (1977-2023)
In the northern semi-arid region of China, winter survival is always a limiting factor for lucerne production, because low temperatures and a dry climate in winter (Zhou et al., 1993; Ma, 2000; Sun & Gui, 2001; Sun et al., 2003). An experiment was conducted to find an appropriate sowing date and P application rate in order to improve lucerne winter survival.
Ear Emergence Of Different Grass Species Under Finnish Growing Conditions, M. Niskanen, O. Niemeläinen, L. Jauhiainen
Ear Emergence Of Different Grass Species Under Finnish Growing Conditions, M. Niskanen, O. Niemeläinen, L. Jauhiainen
IGC Proceedings (1977-2023)
Timothy is the most commonly cultivated grass species in Finland. Swards cultivated for silage of hay are of pure timothy or timothy is the dominant species of the mixture. Successful timing of harvesting of the primary growth is very critical in Northern latitudes where the stand develops very rapidly at daylengths of above 18 hours with a daily mean temperature close to 20 °C. The primary growth has to be harvested within a very short period to obtain a yield of high and uniform quality. Short harvesting periods require high capacity harvest machinery which lead to high costs. If it …
Reasons For The Premature Decline In Astragalus Adsurgens Stands In Kerqin Sandy Land, Q. Zh. Sun, Z. L. Wang, J. G. Han, Y. W. Wang, G. R. Liu
Reasons For The Premature Decline In Astragalus Adsurgens Stands In Kerqin Sandy Land, Q. Zh. Sun, Z. L. Wang, J. G. Han, Y. W. Wang, G. R. Liu
IGC Proceedings (1977-2023)
Diseases partly account for reductions in Astragalus adsurgens, stand longevity. The effect of some cultural practices on the control of pests and diseases have been reported (Hou, 1986; Nan, 1996), but few reports have detailed the relationship among soil fertiliser status, diseases and premature stand decline. This study was conducted to investigate these relationships in order to extend the longevity of Astragalus adsurgens stands.
The Influence Of Fertiliser Application To Strip-Sown Grasslands On Herbage Production And Quality, A. Kohoutek, P. Komárek, V. Odstrčilová, P. Nerušil
The Influence Of Fertiliser Application To Strip-Sown Grasslands On Herbage Production And Quality, A. Kohoutek, P. Komárek, V. Odstrčilová, P. Nerušil
IGC Proceedings (1977-2023)
To increase the productivity of dairy cattle in the Czech Republic requires an improvement in herbage quality and an increase in the net energy of herbage. The decrease in cattle numbers by 50 % and the expansion of the grassland area both result in a surplus of feedstuffs of low quality. Introduction of strip-seeding of legumes and grasses into grasslands in interaction with fertilisation provides a possible solution to this problem.
Range-Based Livestock Production In Turkmenistan, R. H. Behnke, G. Davidson
Range-Based Livestock Production In Turkmenistan, R. H. Behnke, G. Davidson
IGC Proceedings (1977-2023)
Turkmenistan retains a centralized system of livestock production in which many critical assets are owned by the state. Though technically in the temperate zone, the country's climate is harsh and unstable. Groundwater resources are unevenly distributed, leaving many potential grazing areas seasonally inaccessible due to lack of drinking water for livestock. This paper summarizes the results of a three-year study of rangelands, livestock production, flock economics and land tenure at two study sites, one in central and the other in eastern Turkmenistan. The results of this study suggest that pastoral communities in Turkmenistan have coped remarkably well with the institutional …
Mgrre_Thinsections_Mgrre-21_74, Mgrre
Mgrre_Thinsections_Mgrre-21_4, Mgrre
Mgrre_Thinsections_Mgrre-21_14, Mgrre