南オーストラリア州,南東部における石灰成土壌

概要

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The soil formation process on the calcareous materials and limestone was studied in relation to the age of sand dunes. The soil profiles on the calcareous materials and limestone were observed in the area from Robe to Naracoorte in Southeast of South Australia. i) The soil profiles A_1/AC/C, as Rendzina, are found on the sand dune measured as 4,000yr B.P. The soil profile A_1/AB/B/C with calcrete layer has been observed on the sand dune measured as 83,000yr B.P. The soil profiles, A_1/A_3/B_1/B_2/C, as Terra rossa, are found on the sand dune measured as older than 125,000yr B.P. ii) The soils of all soil profiles contain aeolian quarz grains. However, the soils in the B_2 horizon on the sand dune, which have been estimated as 690,000yr B.P., and on the Tertiary limestone do not contain any quarz grains. The clay skin is formed on the surface of the structure in the B_2 horizon. These facts mentioned above mean that the soils have sufficiently been developed in sequence by the age of mother materials.
駒澤大学の論文