Table IV

Details about number of countries and laboratories participating to the ICP-Forests ring-tests for labs since the ICP-Forests was launched in 1985 (after Cools et al., ; Fürst, ; Marchetto et al., ; Mosello et al., ; ; ; ; ; Mues,). The symbol * indicates the number of countries and labs (=sampling systems) that participated to the depositon sampling intercomparison exercise (Draijers et al.,). § Indicates the exercises to which ICP Forests labs took part, but that were organized within different projects (AQUACON–MedBas Subproject No. 6 and “Acid rainε and Subproject No. 7 “Freshwaterε).