1. Nutrient Criteria to Protect Aquatic Life of Streams and Lakes in Intensive Agricultural Watersheds
2. Landscape controls on diffuse nutrient transfers in agricultural catchments
3. Managing Urban Stormwater Quality in a Changing Climate: Science, Engineering and Policy
4. Management Practices to Reduce Nutrient Loss from Agricultural Systems: Research Results Establishing Effective and Non-effective Conservation Practices
5. Emerging Contaminants in Groundwater and Surface Water: Selected Substances, Sources, Monitoring, Risk Assessment and Management
6. Water Quality Trading: Pre-requisite Analyses
Back to the Open Workshops Introduction
Landscape controls on diffuse nutrient transfers in agricultural catchments
This workshop will bring together scientists studying the transfer of nutrients to surface water from basins predominantly under agricultural use. Studies around the world indicate that there is a considerable spatial and temporal variability in diffuse nutrient transfers to surface waters. This variability largely results from interactions between the spatial distribution of nutrient sources, their quantity and mobility and the landscape characteristics governing water flowpaths in response to seasonal precipitation trends. Storage and transformation of nutrients along the flow paths, buffer zones and hydrologic networks are also largely governed by the landscape features. From an operational perspective, morpho-pedological pattern and other characteristics of the landscape are thus important factors to identify critical source areas. Understanding these patterns is important to design contaminant-specific best management scenarios. Landscape patterns largely govern how much, how, and when phosphorus and nitrogen inputs eventually reach the water body. From a spatially integrated perspective, the workshop will particularly address the fluxes of nitrogen and phosphorus in agricultural ecosystems and highlight the landscape controls on their mobility, storage and transformation. Critical questions to which answers will be discussed address three components of landscapes, including:
Field, emission zones:
- What are the influences of landscape properties on nutrient exports through runoff?
- What are the effects and interactions of landscape properties and presence of artificial drainage systems on nutrient subsurface transfer to surface water?
Buffer zones:
- How do landscape properties control the efficiency of structural runoff control in providing an efficient P retention along the concentrated surface runoff flow paths?
- What are the influences of landscape properties on permanent or temporary N and P storage and transformation within field buffer strips and field margins?
Hydrologic network:
- Do landscape properties have a determinant influence on when and how the stream acts as a sink or source of N and P?
- How landscape properties influence the efficiency of wetlands and flood plains in storing N and P fluxes?
Chair: Aubert Michaud, Institut de recherche et de développement en agroenvironnement, Québec, Canada aubert.michaud@irda.qc.ca
Secretary: Deane Wang, University of Vermont, Vermont, USA
Invited Talks:
1 – Dorioz, J-M *. Mechanisms of phosphorus diffuse transfer and transformation: case study of the Lake Geneva region
2 – Mark Dubin **, Mechanisms of nitrogen diffuse transfer to coastal environment: case study of Chesapeake Bay, USA.
* Hydrobiologie Lacustre, INRA-CARRTEL, Thonon, France
** Chesapeake Bay Program Office, University of Maryland, U.S.A.
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