学会誌「自然災害科学」

桜島南岳からの降灰による作物生育被害に関する研究(1) －降灰披害の発現様式に関する実験的解折－

Studies on Crop Growth Damage due to Ash Fall from Mt. Minamidake of Sakurajima (1) - Experimental Indications of Crop Damage due to Ash Fall -

角 明夫*・鈴木 義則**

Akio SUMI* and Yoshinori SUZUKI**

Abstract

The occurrence mechanisms of crop growth damage due to ash fall were examined experimentally. When volcanic ash was mixed into arable soil, the crop growth was reduced with increasing in its amount because of the deterioration in physical and chemical properties of soil. When the normal soil was arranged concentrically around the main root of a crop, the improvement effect by soil admixing could be found on the smaller replacement. The crop growth was also inhibited when volcanic ash accumulated on and above leaves. The negative effect by shading was dependent on its percentage and duration. These results suggest a possibility of simplified soil admixing and a necessity of excluding volcanic ash from covering surface without delay.

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