Influence of fertilizing on the ~(137)Cs soil-plant transfer in a spruce forest of Southern Germany

摘要

Fertilization with 2.5 t/ha limestone: (83% CaCO_3, 8% MgO, 6% K_2O, 3% P_2O_5) reduces the ~(137)Cs transfer from spruce forest soil into plants like fern (Dryopteris carthusiana) and blackberry (Rubus fruticosus) by a factor of 2-5 during at least 11 years as measured by the aggregated transfer factor T_(ag). In 1997 and 2006 these results were confirmed by additional measurements of the ~(137)Cs transfer factor TF, related to the root zone (O_h horizon), which were explained by the selective sorption of ~(137)Cs in the root zone by measurements of the Radiocaesium Interception Potential (RIP) in fertilized (RIP > 179 meq/kg) and non-fertilized soils (RIP < 74 meq/kg).