AgrHyS Environmental Research Observatory Site of Kervidy-Naizin - France

Basic Information

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AgrHyS Environmental Research Observatory Site of Kervidy-Naizin

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General Site Description: 

Located in central Brittany, western France, the catchment of Kervidy-Naizin is underlain by old bedrock and is characterised by a oceanic, humid and temperate climate and by an intensive agriculture. The hydrology is controlled by a shallow aquifer made of the unconsolidated weathered bedrock. The water table in the aquifer is close to the soil surface in bottom land areas of catchment. During storm event, surface runoff occurs mainly over the saturated soils of bottom lands. The Environmental Research Observatory (ERO) AgrHyS focuses on the response times of changing Agro-Hydro-Systems (defined as a catchment influenced by agricultural activity) for hydro-chemical fluxes.


General Characteristics, Purpose, History

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Purpose of Site : 

The Kervidy-Naizin is specially dedicated to the study of biogeochemical cycles of Carbon, Nitrogen and Phosphorus in agricultural landscapes, and their hot spots-hot moments of coupling.

History of Site: 

The catchment of Naizin (12 km2) was instrumented in 1972 by Irstea (originally Cemagref) to assess the effect of reparcelling and hedgerows removal during the intensification of agriculture on hydrology, erosion and crop yield. Since 1992, INRA monitors the site the Kervidy-Naizin which is a sub-basin of the catchment of Naizin, to assess the effect of agriculture and climate on water and solutes transfers. Since the end of the 90ies, the shallow groundwater and soil water are investigated too and since 2006, the atmospheric compartment is also monitored to quantify Nitrogen gas and GES emissions. A large range of chemical species are analyzed in all the compartments (surface, soil, groundwater, soils, and atmosphere) in order to understand and quantify the coupled biogeochemical cycles of macro nutrient (N, C and P).

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Latitude: 47.972254900000
Longitude: -2.848977900000