The effect of chronic gamma irradiation on decay of oak (Quercus pubescens Willd) and dogwood (Cornus mas L.) leaves and subjacent litter

Experiments showed that ionizing radiation increased decay of leaves and caused greater release of organic compounds (9–20 per cent, depending on the species, relative to carbon content) and mineral elements (20–50 per cent depending on the species and the element considered). The irradiated samples also showed substantial lowering of water storage capacity, variation in the free radicals (in particular phenolics and carbonylics) and in the release of organic compounds.

The effect on the soil surface horizons was an enhancement of leaching of organic and mineral compounds (fulvic acid and accelerated manganese and zinc). Humus loss was 8–10 per cent per annum in the surface horizon and 3–5 per cent in the subjacent horizon.