Significance of Loess Addition in Relation to Andic Soil Properties of Volcanic Ash Soils

概要

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Sixty two soil-loess combinations using 2 loess samples from China and 6 volcanic ash soils from Japan were studied to determine the contribution of loess to some of the chemical properties of Andisols. Prior to mixing the loess with the soil samples, CaCO_3 was removed by pretreating the loess samples with a sodium acetate buffer solution. The various chemical criteria evaluated included the phosphate retention (PR) values, amount of oxalate-oxalic acid extractable aluminum (Alox)+1/2 oxalate-oxalic acid extractable iron (Feox), and fluoride pH. These chemical properties were selected due to their importance as diagnostic criteria in Andisol classification. These was an inverse relationship between the PR values and amounts of loess added while a direct relationship was detected between the PR values and the amounts of volcanic ash soils. A level of more than 60 to 70% loess incorporation was critical to attain PR values above 85%. On the other hand, approximately less than 30 to 40% loess incorporation was necessary to obtain Alox + 1/2 Feox values above 20 g kg^<-1>. A negatively significant correlation was observed between the percentage loess and Alox + 1/2 Feox (g kg^<-1>) values while there was a positively significant correlation between the amount to 6 allophanic volcanic ash soils in relation to Andisol classification was discussed.
一般社団法人日本土壌肥料学会の論文