酸性雨降雨条件での有機農耕土壌からの酸および窒素流出特性

抄録

Nitrogen and acid leaching from agricultural soil fertilized with compost was examined during acid rain fall conditions using soil columns. The pH value in the effluent from the soil columns increased to>8.0 although pH of rain water was 4.1. Exchangeable calcium and magnesium neutralized the hydrogen ions and eluted from the soil. Carbonate produced from the organic carbon in the compost was also useful for neutralization. Nitrification and denitrification occurred in the soil during low rainfall conditions, Sulfate reduction and sulfur denitrification also occurred in the soil. Supplement of exchangeable calcium by compost promoted to ion exchange in the upper layer. IC produced from the soil organic matters and the compost was also effective to neutralize the acid rain. In the lower soil layer, denitrification occurred and neutralized the acid rain. Fertilization with compost accelerated denitrification and sulfate reduction in the lower soil layer, and decreased nitrate concentration in the effluent.