Abstract
In a closed-canopy forest only a small proportion of the annual nutrient uptake becomes permanently immobilized in structural tissue, the remainder returns to the soil through litter fall and crown leaching (Stenlid 1958). Little is known of the relative importance of these two pathways, partly because of the difficulty of separating true crown leaching from the wash down of air-borne salts that have previously been deposited on the surface of the trees (Attiwill 1966). This paper presents values for nutrient content in the litter that fell beneath pole-stage Corsican pine (Pinus nigra var. maritima (Ait.) Melv.) over a period of six years, together with results from a two-year study of the movement of nutrients in rainwater. The term 'gain' is used to denote the total quantity of nutrients returned to the soil by the rainwater, i.e. both the wash down of deposited aerosols and crown leaching.
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