Browsing Theses by Subject "phosphorus"
Now showing items 21-32 of 32
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Phytoplankton community composition effects on phosphorus sedimentation dynamics in Lake Erie
(University of Waterloo, 2007-10-01)Cultural eutrophication is caused by the excess addition of phosphorus to aquatic ecosystems, and has long been a water quality management issue in Lake Erie. Despite successful reductions in external loading of phosphorus ... -
Phytoplankton dynamics in nearshore and offshore regions of the Great Lakes Erie, Malawi, Tanganyika, and Victoria
(University of Waterloo, 2008-02-22)My doctoral thesis challenges the traditional paradigm of phosphorus (P) limitation of phytoplankton communities in freshwaters by suggesting colimitation of P, nitrogen (N), and iron (Fe) in Great Lakes. Oceanographers ... -
Potential and Observed Release of Phosphorus from Crop Residue and Cover Crops Over the Non-growing Season in a Cool Temperate Region
(University of Waterloo, 2016-10-11)Maintaining crop residue or cover crops on fields during winter is a recommended Best Management Practice (BMP) in temperate regions. However, losses of phosphorus (P) to runoff have been attributed to vegetation following ... -
Preferential flowpaths and fertilizer placement influence subsurface P transport across soil textures and seasonal conditions
(University of Waterloo, 2018-12-14)Agricultural tile drains are a source of phosphorus (P) contributing to eutrophication. Preferential flowpaths can rapidly transport P to tile drains, but their activation in different soil textures and under variable ... -
Quantifying the role of reservoirs in altering phosphorus dynamics using a combination of data analysis and process modeling
(University of Waterloo, 2022-04-29)Excess phosphorus (P) from agricultural watersheds promotes eutrophication in downstream aquatic systems. Reservoirs retain P generated from farm fields and protect downstream waters. Reservoirs also act as hotspots for P ... -
A Random Forest in the Great Lakes: Exploring Nutrient Water Quality in the Laurentian Great Lakes Watersheds
(University of Waterloo, 2020-09-22)A data driven approach was used in this study to investigate the drivers of nutrient water quality across the Laurentian Great Lakes drainage basin. Monitored time series of nutrient water quality and discharge were modelled ... -
Recoupling the Livestock Nutrient Economy: A Path forward for Water Quality Improvement
(University of Waterloo, 2019-09-23)Intensification of farming operations and increased nutrient application rates have led to higher crop yields and greater food security. At the same time, widespread use of commercial nitrogen (N) and phosphorus (P) ... -
The role of submersed macrophytes in river eutrophication and biogeochemical nutrient cycling
(University of Waterloo, 2012-09-28)The goal of this work is to contribute to the understanding eutrophication in large rivers with a detailed study of the Grand River, an impacted river in highly agricultural and urbanized Southern Ontario. It focuses on ... -
Runoff Response and Nutrient Loading in Vertisolic Clay Soils of Near-Level Artificially Drained Southern Manitoban Landscapes
(University of Waterloo, 2020-03-04)The installation of tile drainage systems in Southern Manitoba has been accelerating over the past two decades to improve crop production. Given current environmental and political concerns related to agricultural pollution ... -
Spatial and Temporal Trends in Water Quality in a Mixed-Use Landscape: Agriculture vs. Urban Areas
(University of Waterloo, 2018-10-22)The eutrophication of aquatic ecosystems is a growing water quality concern as it can promote the proliferation of harmful algal blooms that have severe environmental, health, and economic impacts. In United States alone, ... -
The use of a filter product to remove phosphorus from surface runoff in agricultural fields
(University of Waterloo, 2021-09-28)Nutrient losses from agricultural fields are the largest sources of phosphorus (P) entering the Great Lakes in North America. Research has suggested that multiple conservation practices (CPs) used together (stacked) are ... -
Wet Weather Performance of an Extensive Vegetated Roof in Waterloo, Ontario
(University of Waterloo, 2008-12-10)Vegetated roof technologies are increasingly being adopted as treatment measures to mitigate the effects of urban stormwater. A mass balance approach was used to assess the wet weather performance of a vegetated roof on ...