Interaction matrix for terrestrial pathways of tritium transfer and - - PowerPoint PPT Presentation

Séverine Le Dizès

Environment and Emergency Operations Division Department for the Study of Radionuclide Behavior in Ecosystems Environmental Modelling Laboratory Cadarache, St Paul-lez-Durance, France

Interaction matrix for terrestrial pathways of tritium transfer and discussion…

January 26th, 2010

General interaction matrix

ATMO S YS TEM Deposition Deposition Inhalation External RIVER S YS TEM Animal watering Irrigation Food & water collecting Inhalation External MARINE S YS TEM Food collecting Inhalation External Watershed erosion (*) AGRI S YS TEM Migration Food collecting Inhalation External Irrigation VADOZE & AQUIFER (*) Water collecting Animal feeding FOOD S YS TEM Ingestion MAN

(Release) (Release) (Release) (Release) (RELEASE SYSTEM)

Tritium interaction matrix for the terrestrial system (1)

Soil RootUptake Evapo- ration Excretion Death & decomp. Literfall Senescence & death Root exud. WetDepos DryDepos Irrigation … Inhalation NetPrimaryProd. FoliarAbsorption WetDepos. DryDepos. Atmo- sphere Evapo- transp. Pollen & seeds release Animals Excretion? Death? RestOfPlant OrganicMatter RadDecay BiolGrowth BiolDecay Water RadDecay

(Organ)

Ingestion

• Transloc.

Plant

Ingestion Animals Ingestion Ingestion Ingestion Inhalation Inhalation (burrowing animals) Excretion Death & decomposition Excretion Exhalatio n Deposition DiffusiveExch DryDepos WetDepos Irrigation WetDepos. DryDepos. Atmo- sphere Evapo- ration Diffusive- Exch Evapo- ration “RestOfWorld” (water bodies, etc.) Irrigation Air RadDecay Adsorption IsotopicExch Solubilisation RootUptake Degassing OrganicMatter RadDecay Desorption Migration Degassing IsotopicExch Sorption Fixation Water RadDecay RootUptake

Soil

Literfall Senescence & death Root exudation

Plant

Tritium interaction matrix for the terrestrial system (2)

Questions/discussion… 1. Should we divide plant into leaf foliar system (NPP, HTO foliar absorption…) and root system (rootuptake) ? 2. Should we consider starch metabolism within plants? 4. Consider following factors that influence transfer processes, such as : Air : PAR, concentration in AIR, temperature Plants : LAI Soils : texture, temperature… 3. Should we consider other compartments in soils (microbiota, inorganic matter,etc.) and associated transfer processes ? 5. Consider HT releases?

Next EMRAS meeting : In Aix-en-Provence (South of France), September 6th- 9th