大野原泥炭層の土壌化学的解析 : 特に黒ボク土に関連した性質について

概要

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In order to elucidate the genesis of Kurobokudo in Tokai district, Japan, chemical analysis was done on the samples of peatland at Tsukude, Aichi prefecture. The results are summarized as follows. (1) Samples were dominantly peaty to the depth of 325cm. According to Sawai (1986) and Fujii (1986), the peaty layers included the volcanic tephra of Akahoya (6,300YBP), Utsuryo-Oki (9.300YBP), Daisen (17,000YBP) and Aira-Tanzawa (ATn, 22,000-23,000 YBP). (2) The values of fluoride pH were remarkably varied among the layers, and more than 9.5 near the layers including tephra of Akahoya, Daisen and ATn. The fluctuation of the phosphate absorption coefficient was also considerable, and the values were more than 3,000 near the upper part of the layers with the tephra of Daisen or ATn. (3) The relative color intensity (K_<600>/C of the humic acids varied very much, too. The values were especially high between 170-210cm (>2.6) and between 100-170cm (>5.3), but decreased toward the surface gradually. (4) These results suggested that Kurobokudo was not formed in this district during the several thousands years after the fall of ATn, and that, thereafter, it developed and then regressed gradually. (5) The problems concerning the interpretation of chemical properties of the peaty layers were discussed.
日本ペドロジー学会の論文
1988-06-30