| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Research Abstract |
Input of major nutrients (Na, K, Mg, Ca) by the throughfall and stemflow wag measured at every rainfall through a year (Aug., 1988 - Aug. 1989) in both natural regenerated (broad leaves) and planted (pine) forests at burnt area (burnt in 1978) of the Etajima Island, Hiroshima, Japan. Annual throughfall was larger in the pine forest (83% of the annual precipitation, 1216mm) than in the broad leaves forest (72 %), while stemflow wa observed in the reverse relationship. The interception by forest canopy was estimated at 16.3%, 7.3% in the broad leaves and pine forests, respectively. The input of major nutrients except for sodium by rainfall was bigger in the broad leaves forest than the pine forest. It was mainly due to the more input by reaching from plant bodies in the former than in the latter, which was measured by cutting aerosol to attach the plant bodies, using a big vinyel cover. The annual input of potassium was 26.1 and 12.8 kg/ha, and that of sodium was 7.2 and 11.7 kg/ha in the broad leave and pine forests, respectively. About 70% of the input of potassium was derived from the reaching in the broad leaves forest, while 27% in the pine forest. However, only 7% of them was derived from the reaching in the case of sodium in both forests, owing to the low concentration of it in plant bodies.
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