Uptake of 137Cs by berries, mushrooms and needles of Scots pine in peatland forests after wood ash application

Increasing use of wood fuels for energy production in Finland since the 1990s implies that large quantities of the generated ashes will be available for forest fertilization. The aim of this study was to analyse the effect of wood ash application on 137Cs activity concentrations in Scots pine (Pinus sylvestris L.) needles and certain berries and mushrooms on drained peatlands. The study was based on field experiments carried out on two mires in Finland in 1997–1998. Two different types of wood ash were applied at dosages of 3500, 3700, 10 500 and 11 100 kg ha−1. Wood ash did not increase 137Cs activity concentration in plants in the second growing season following application. On the contrary, a decrease in 137Cs activity concentration was seen in the plants of the ecosystem on drained peatlands. This result is of importance, for instance, when recycling of ash is being planned.

Research highlights
► The study confirmed the fast response of Scots pine to ash application.
► Wood ash decreased the 137Cs activity concentration in Scots pine needles.
► Wood ash did not increase the 137Cs contamination in wild berries and mushrooms.
► The results are of importance when recycling of ash is being planned.