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Characterization of phosphorus transport at spring melt in small agricultural watersheds of Eastern Canada

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Abstract:

This project takes place in the Bras d’Henri watershed (150 km2) located south of Quebec City. With its intensive farming system and a marked intensification of hog production in recent years, the regional soils present increasingly high phosphorus (P) contents. Two small agricultural watersheds (300 ha) under study show dominant spodosols and inceptisols with high soil P sorption capacity and P balance mostly in equilibrium. Nevertheless, problems of soil water erosion and surface runoff still contribute significantly to the P nonpoint-source pollution of the first order streams as monitored at watershed outlets from 2004 to 2008. Yearly temporal patterns of particulate and soluble P transport are critical to assess P bioavailability for algae in streams but remain poorly documented particularly at snow melt runoff. Early snow accumulation on wet soils generally results in unfrozen soils which allow melt water infiltration at spring melt. However, frozen soils present a high risk of snow melt erosion. This project shows that snow water equivalent accumulating in different proportions on landscape (95-20%) and depressions (5-80%) is critical for agricultural soil and stream bank erosion at spring. Soil frozen status and water infiltration at snowmelt were analyzed by the use of a GIS. Soil temperature maps were classified at the watershed scale using Radarsat-1 images, topography (slopes), soil types, land use, soil management and in situ soil surface (Hobo) and soil profile (thermocouple) spatial variation monitoring. Main snow melt resulted in significant losses of particulate reactive P (0.4 mg L-1) to surface water.
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Association:
Name: SOIL AND WATER CONSERVATION SOCIETY
URL:
http://www.swcs.org


Citation:
URL: http://citation.allacademic.com/meta/p235522_index.html
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MLA Citation:

van Bochove, Eric., Thériault, Georges., Zhou, Jian., Khaldoune, Jalal., Denault, Jean-Thomas., Perrodin, Hubert. and Nolin, Michel. "Characterization of phosphorus transport at spring melt in small agricultural watersheds of Eastern Canada" Paper presented at the annual meeting of the SOIL AND WATER CONSERVATION SOCIETY, TBA, Tucson, Arizona, Jul 26, 2008 <Not Available>. 2013-12-14 <http://citation.allacademic.com/meta/p235522_index.html>

APA Citation:

van Bochove, E. , Thériault, G. , Zhou, J. , Khaldoune, J. , Denault, J. , Perrodin, H. and Nolin, M. C. , 2008-07-26 "Characterization of phosphorus transport at spring melt in small agricultural watersheds of Eastern Canada" Paper presented at the annual meeting of the SOIL AND WATER CONSERVATION SOCIETY, TBA, Tucson, Arizona <Not Available>. 2013-12-14 from http://citation.allacademic.com/meta/p235522_index.html

Publication Type: Oral Presentation
Abstract: This project takes place in the Bras d’Henri watershed (150 km2) located south of Quebec City. With its intensive farming system and a marked intensification of hog production in recent years, the regional soils present increasingly high phosphorus (P) contents. Two small agricultural watersheds (300 ha) under study show dominant spodosols and inceptisols with high soil P sorption capacity and P balance mostly in equilibrium. Nevertheless, problems of soil water erosion and surface runoff still contribute significantly to the P nonpoint-source pollution of the first order streams as monitored at watershed outlets from 2004 to 2008. Yearly temporal patterns of particulate and soluble P transport are critical to assess P bioavailability for algae in streams but remain poorly documented particularly at snow melt runoff. Early snow accumulation on wet soils generally results in unfrozen soils which allow melt water infiltration at spring melt. However, frozen soils present a high risk of snow melt erosion. This project shows that snow water equivalent accumulating in different proportions on landscape (95-20%) and depressions (5-80%) is critical for agricultural soil and stream bank erosion at spring. Soil frozen status and water infiltration at snowmelt were analyzed by the use of a GIS. Soil temperature maps were classified at the watershed scale using Radarsat-1 images, topography (slopes), soil types, land use, soil management and in situ soil surface (Hobo) and soil profile (thermocouple) spatial variation monitoring. Main snow melt resulted in significant losses of particulate reactive P (0.4 mg L-1) to surface water.

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