The behaviour of nutrient elements such as N, P, K, Ca, and Mg in a forest ecosystem have been reported. Most of these reports have beenmainly focused on the amounts of nutrient elements and the circulation in a forest. However, many metal elements beside above mentioned elements returned to forest soil with throughfall, stemflow, dust, and litterfall. In this paper, the bahviour of metal elements returned to a forest soil with litterfall was investigated at Kiryu experimental site, southeast part of Shiga prefecture, where the stand of this site mainly comprises of Hinoki (Chamaecyparis obtusa Endl.),Akamatsu (Pinus densiflora Sieb. et Zucc.), and Kuromatsu (Pinus Thunbergii Pa rl). Litterfall was collected over two years (from Nov., 1985 to Oct., 1987). Litterfall increased from October to December, and the annual average was 5.03 kg/ha. The metal elements in litterfall were measured using instrumental neutronactivation analysis. The metal elements such as Ca, Mn, Al, Fe, Na, Zn, Rb, La , Ce, Sm, and Sc were detected in all samples, but V was detected in only apart of samples. The amounts of metal elements returned to the forest soi with litterfall were as follows; Ca 30.1, Mn 3.27, Al 2.12, Fe 0.91, Na 0.40, Zn 0. 17 (in kg/ha) and Rb 19.5, La 6.93, Ce 4.27, V 1.76, Sm 1.62, Sc 0.24 (in g/ha).
181.8 (Phänologie) 181.32 (Beziehungen zum Boden und zu Nährstoffen im allgemeinen) 181.34 (Beziehungen zu Bodennährstoffen und zur Chemie des Bodens) 160.24 (Unentbehrliche Elemente und Verbindungen) [520] (Japan)
