Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Anthropogenic climate change (1)
- Big bluestem grass (1)
- Carbon (1)
- Catchment (1)
- Cellulose (1)
-
- Char (1)
- Experimental burning (1)
- Fire severity (1)
- Flux (1)
- Forest (1)
- Global climate oscillation (1)
- Lignin (1)
- Nitrogen (1)
- Non-stationary (1)
- Nutrient (1)
- Oxygen isotopes (1)
- Paleo-fires (1)
- Phosphorus (1)
- Red pine (1)
- Stationary (1)
- Stream (1)
- Surface water (1)
- Time series (1)
- Topography (1)
- Variable source area (1)
- Wavelet analysis (1)
- Wetland (1)
- White oak (1)
Articles 1 - 2 of 2
Full-Text Articles in Environmental Sciences
Topographic Influences On Trends And Cycles In Nutrient Export From Forested Catchments On The Precambrian Shield, Samson G. Mengistu
Topographic Influences On Trends And Cycles In Nutrient Export From Forested Catchments On The Precambrian Shield, Samson G. Mengistu
Electronic Thesis and Dissertation Repository
This dissertation explored topographic controls on spatial and temporal patterns in water yield and nutrient (carbon, nitrogen and phosphorus) export from forested headwater catchments in the Turkey Lakes Watershed in central Ontario, where other factors contributing to differences in water yield and nutrient export, including climate, geology, forest, and soils, are relatively constant. Topographic characteristics, including (a) hydrological flushing potential (expansion of water table into nitrate-N producing areas); (b) hydrological storage potential (area of wetlands, which can alternatively allow water and nutrients to bypass wetlands when storage capacity is filled with water or to trap them when not filled); and …
Reconstructing Fire Severity From The Oxygen-Isotope Compositions Of Plant Char, Michael W. Hamilton
Reconstructing Fire Severity From The Oxygen-Isotope Compositions Of Plant Char, Michael W. Hamilton
Electronic Thesis and Dissertation Repository
This study assessed whether variations in the oxygen-isotope compositions of char formed from biomass burning could be related to burning severity. Ground samples of oak (Quercus alba), pine (Pinus resinosa), and grass (Andropogon gerardii) were charred for 5 and 30 minutes at constant temperatures between 200 and 900°C under oxygenated versus anaerobic conditions. Char oxygen-isotope values became progressively depleted of 18O by up to 25.8‰ for wood and 16.5‰ for grass as temperature, duration of burning, and amount of oxygen increased. The primary reason for the decrease in oxygen-isotope values is the loss …