Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Peat (2)
- Soil organic matter (2)
- Ambient vibration (1)
- Atmospheric deposition (1)
- Bioavailability (1)
-
- Brookston (1)
- Cacao (1)
- Carbon isotope (1)
- Chronology (1)
- Climate chamber (1)
- Climate history (1)
- Coupled heat and water movement (1)
- Cover cropping (1)
- Earth analogue (1)
- Earthquake (1)
- Ecohydrology (1)
- Geomorphology (1)
- Glacial till (1)
- Great Lakes (1)
- HPLC (1)
- Hudson Bay Lowlands (1)
- Hydrology (1)
- Infiltration (1)
- Linear disturbance (1)
- Maize (1)
- Mars (1)
- Mercury (1)
- N-alkane (1)
- No-till (1)
- Organic matter (1)
Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Soil Organic Carbon Dynamics And The Effects Of Resident Vegetation In Pelee Island Soils, Colton Geil
Soil Organic Carbon Dynamics And The Effects Of Resident Vegetation In Pelee Island Soils, Colton Geil
Electronic Thesis and Dissertation Repository
Soil organic carbon (SOC) enhances nutrient retention, structural stability, porosity, aeration, water infiltration, and overall soil health. Understanding SOC turnover and its preservation in soils is paramount to managing carbon sequestration. On Pelee Island, we used δ13C, δ15N and C/N of SOC at various depths to identify the sources and evolution of SOC with time. At depths >150 cm, SOM was from a mixture of aquatic and terrestrially derived sources. We also analyzed the impact of permanent cover crops called ‘resident vegetation’ on the ability of soils to store carbon in different aggregate size fractions. SOC …
Determining Geological Controls On Nutrient Availability At Different Depths In The Soils Of The Pelee Island Winery, Lindsay M. Blythe
Determining Geological Controls On Nutrient Availability At Different Depths In The Soils Of The Pelee Island Winery, Lindsay M. Blythe
Electronic Thesis and Dissertation Repository
Terroir describes a sense of place that can give a unique flavour to wines grown in different environments. We explored the role of soil in the terroir at Canada’s most southern vineyard, Pelee Island Winery. This study examined the abundance of major nutrients, trace and rare earth elements of minerals and plant extractable nutrients from 19 soils across the vineyard to a depth of 2 m. We found that bedrock does not influence the element content of Pelee Island soils, the parent materials of the soils are tills and there are geochemical, mineralogical and grain size differences between the two …
Stable Carbon Isotope Variations Of Organic Matter And N-Alkanes In The Plant-Bulk Soil-Clay Fraction Continuum, Alana Crump
Stable Carbon Isotope Variations Of Organic Matter And N-Alkanes In The Plant-Bulk Soil-Clay Fraction Continuum, Alana Crump
Electronic Thesis and Dissertation Repository
Organic matter (OM) adsorbed to clay minerals in soils can have C/N similar to lacustrine algal matter. Accurate source identification of OM in sediments is crucial for predicting future climate change impacts in the Great Lakes region. We analyzed C/N, carbon-isotope compositions, n-alkane abundances and compound-specific carbon-isotope compositions of vegetation, soil, and OM associated with clay minerals in soils and glacial till in order to determine if (i) OM associated with clay minerals has unique signatures distinct from lacustrine algal matter and is traceable to modern vegetation, and (ii) if these signatures have been transferred to and preserved in …
The Periglacial Landscape Of Mars: Insight Into The 'Decameter-Scale Rimmed Depressions' In Utopia Planitia, Arya Bina
Electronic Thesis and Dissertation Repository
Currently, Mars appears to be in a ‘frozen’ and ‘dry’ state, with the clear majority of the planet’s surface maintaining year-round sub-zero temperatures. However, the discovery of features consistent with landforms found in periglacial environments on Earth, suggests a climate history for Mars that may have involved freeze and thaw cycles. Such landforms include hummocky, polygonised, scalloped, and pitted terrains, as well as ice-rich deposits and gullies, along the mid- to high-latitude bands, typically with no lower than 20o N/S. The detection of near-surface and surface ice via the Phoenix lander, excavation of ice via recent impact cratering activity as …
Identification Of Ancient Maya Agriculture In The Periphery Of Motul De San José, Alexandra E. Smofsky
Identification Of Ancient Maya Agriculture In The Periphery Of Motul De San José, Alexandra E. Smofsky
Electronic Thesis and Dissertation Repository
Agricultural systems were investigated in the Motul de San José periphery, an ancient Maya polity in Guatemala, using soil geochemical techniques. The δ13C values of soil organic matter delineated areas of ancient maize agriculture at the satellite center of Kante’t’u’ul. A new method to locate areas of former cacao cultivation or processing was developed using HPLC to detect theobromine, an alkaloid of the cacao plant, preserved in soils. Extraction of spiked soils revealed that theobromine adsorption is inversely correlated with organic matter content of soils. Detection of naturally occurring theobromine was successful, demonstrating its utility as a tracer. …
Runoff Generation In A Tropical Dry Forest Watershed: Processes, Patterns And Connectivity, Kegan K. Farrick
Runoff Generation In A Tropical Dry Forest Watershed: Processes, Patterns And Connectivity, Kegan K. Farrick
Electronic Thesis and Dissertation Repository
The lack of understanding regarding the controls that govern runoff generation in tropical dry forests represent a critical gap in the hillslope and catchment hydrology literature. Tropical dry forests account for approximately 42% of the global tropical forests, but represent less than 1% of the forest hydrology literature. Three complementary studies were undertaken in a small tropical dry forest watershed, Mexico, to assess the controls that govern the retention and release of a rainfall in the catchment as runoff. In the first study, the high soil surface hydraulic conductivities, absence of a water repellent surface and low rainfall intensities during …
Peat As An Archive Of Remote Mercury Deposition In The Hudson Bay Lowlands, Ontario, Canada, William James Goacher
Peat As An Archive Of Remote Mercury Deposition In The Hudson Bay Lowlands, Ontario, Canada, William James Goacher
Electronic Thesis and Dissertation Repository
Peat from the Hudson Bay Lowlands (HBL) in Northern Ontario, Canada was used to reconstruct historical accumulation of mercury (Hg) over more than 7000 years before present. Nine cores, many with previously published paleoclimate studies, were analyzed for Hg and accumulation rates were calculated. Anthropogenic Hg enrichment factors were calculated based on accumulation rates. A more exclusive calculation of the anthropogenic enrichment factor corroborates modelling efforts that have suggested re-cycling legacy Hg is a much greater contributor to present day deposition than previously thought, but not prior to ~500 cal yrs BP. An older pre-industrial record provides a better background …
Mitigating Permafrost Degradation Due To Linear Disturbances In Sub-Arctic Peatlands, Aaron A. Mohammed
Mitigating Permafrost Degradation Due To Linear Disturbances In Sub-Arctic Peatlands, Aaron A. Mohammed
Electronic Thesis and Dissertation Repository
The presence or absence of permafrost significantly influences the hydrology and ecology of northern watersheds. Linear disturbances resulting from tree canopy removal have led to widespread permafrost degradation in northern peatlands. Seismic lines resulting from oil and gas exploration now account for large portions of the drainage density of sub-arctic basins, and affect the region’s water and energy balances. As these peatlands represent some of the most sensitive ecosystems to climate and human disturbances, the ability to simulate perturbations to natural systems in a controlled lab environment is particularly important. This study presents a method that is able to simulate …
Seismic Microzonation Of Great Toronto Area And Influence Of Building Resonances On Measured Soil Responses, Dimitar Genchev Mihaylov
Seismic Microzonation Of Great Toronto Area And Influence Of Building Resonances On Measured Soil Responses, Dimitar Genchev Mihaylov
Electronic Thesis and Dissertation Repository
A pilot seismic microzonation of the Greater Toronto Area (GTA) is used to establish the conditions and limitations of geophysical methods for site response investigations in city conditions. Maps of fundamental soil resonant frequencies, amplifications at these frequencies and interpolated average shear wave velocity of top 30 m of soil profile (VS- 30) used in soil classification were compared to the maps of drift thickness and surficial geology for the GTA. The non-applicability of the interpolated VS-30 map for site classification between measured test points is indicated. It is also shown that the soil response cannot be estimated properly using …