Browsing Earth and Environmental Sciences by Subject "biogeochemistry"
Now showing items 1-8 of 8
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Aqueous speciation of selenium during its uptake by green algae Chlamydomonas reinhardtii
(University of Waterloo, 2013-05-03)Selenium (Se) is a micronutrient, yet elevated Se can be toxic to aquatic organisms. The range of Se concentrations within which Se uptake goes from insufficient to toxic is very narrow. It is thus important to understand ... -
A characterization of the controls of the nitrogen and oxygen isotope ratios of biologically-produced nitrous oxide and nitrate in soils
(University of Waterloo, 2011-08-02)Nitrous oxide (N₂O) is a potent greenhouse gas, an important driver of climate change, and its concentration in the atmosphere is rising at an unprecedented rate. Agriculture is the leading contributor of all the anthropogenic ... -
Dissolved Organic Matter in the Canadian Arctic & Sub-Arctic: Importance of DOM Quality & Quantity in a Warming Climate
(University of Waterloo, 2019-08-28)Dissolved organic matter (DOM) is a ubiquitous component of aquatic and terrestrial systems and an important constituent that can influence aquatic health and drinking water quality. For instance, DOM can act as an important ... -
Historical Trends in Water Quality in the Grand River, Ontario: Reconstruction of Phosphorus Loadings
(University of Waterloo, 2014-01-29)Phosphorus, a mineral nutrient, is an essential element in aquatic systems. It is only available for biological activity in the form of orthophosphate and soluble restrictive phosphate. Eutrophication, caused by nutrient ... -
Hydrobiogeophysics: Linking geo-electrical properties and biogeochemical processes in shallow subsurface environments
(University of Waterloo, 2018-12-13)Microbially mediated reactions drive (bio)geochemical cycling of nutrients and contaminants in shallow subsurface environments. Environmental forcings exert a strong control on the timing of reactions and the spatial ... -
Impact of Winter Soil Processes on Nutrient Leaching in Cold Region Agroecosystems
(University of Waterloo, 2021-02-25)High-latitude cold regions are warming more than twice as fast as the rest of the planet, with the greatest warming occurring during the winter. Warmer winters are associated with shorter periods of snow cover, resulting ... -
The Nitrogen Legacy: Understanding Time Lags in Catchment Response as a Function of Hydrologic and Biogeochemical Controls
(University of Waterloo, 2016-09-23)Global population has seen a more than threefold increase over the last 100 years, accompanied by rapid changes in land use and a dramatic intensification of agriculture. Such changes have been driven by a great acceleration ... -
Transport and Retention of Particulate Organic Matter in Riverbed Sediments: Laboratory Experiments and Modelling
(University of Waterloo, 2022-09-22)Infiltration of river water into riverbeds can deliver particulate organic matter (POM: the remains of plants, algae, and other life), which has an important role for transforming nutrients in watersheds. Once POM is ...