Atmospheric iodine, selenium and caesium depositions in France: II. Influence of forest canopies

Estimation of the canopy influence on atmospheric inputs iodine (I), selenium (Se) and caesium (Cs) in terrestrial ecosystems is an essential condition for appropriate biogeochemical models. However, processes involved rain composition modifications after its passage through forest have been barely studied these elements. We monitored I, Se Cs concentrations both rainfall throughfall fourteen French forested sites throughout one year, estimated dry deposition exchange fluxes elements, as well speciation I Se. Comparison elemental highlighted important impact (i) Cs, (ii) species. For three most their were higher than corresponding rainfall. The increase was mostly due to although model revealed some sorption within cases; foliage leaching influencing. Regarding speciation, species highly modified by with unidentified proportion (on average 49 82% throughfall, respectively), possibly washoff and/or transformation into organic forms. Similarly, while composed 26–54% inorganic Se, undetectable throughfall. This dataset represents key information improve modelling cycling ecosystems.