Properties of the surface horizon of nonallophanic Andosols on the Kuju Plateau and the northern Aso somma, Kyushu

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  • KUBOTERA Hideo
    Natl. Agric. Food Res. Org., Kyushu Okinawa Agric. Res. Cent.:(Present office)Natl. Agric. Food Res. Org., Natl. Agric. Res. Cent.
  • KUSABA Takashi
    Natl. Agric. Food Res. Org., Kyushu Okinawa Agric. Res. Cent.
  • SHIMA Takeo
    Natl. Agric. Food Res. Org., Kyushu Okinawa Agric. Res. Cent.
  • SHISHIBE Iwao
    Oita Pref. Agric. For. Fish. Res. Cent.:(Present office)Oita Pref. Hohi Reg. Bur.
  • KAGEI Masao
    Oita Pref. Agric. For. Fish. Res. Cent.

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  • 久住高原から阿蘇外輪山北方における非アロフェン質の黒ボク土表層の特性
  • キュウジュウコウゲン カラ アソガイリンザン ホッポウ ニ オケル ヒアロフェンシツ ノ クロ ボクド ヒョウソウ ノ トクセイ

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Abstract

We analyzed the top 15 cm of soil at 133 sites in a region of Andosols around the northern Aso somma and the east of the Kuju Plateau, Kyushu; we divided the samples into 69 nonallophanic soils (Al_p/Al_o &ge; 0.5), 59 allophanic soils (Al_p/Al_o < 0.5), and 5 non-Andosols. Nonallophanic soils were densely distributed on the Kuju Plateau and on the northwestern Aso somma; their acidity was similar to that of nonallophanic Andosols in other regions, such as Tohoku, whereas the total carbon content, the ratio of total carbon to Al_p/Al_o, and the ratio of total carbon to Al_p were larger than those of other regions. In addition, the relatively large Sio of the nonallophanic soils suggested a greater content of allophane and imogolite than in nonallophanic Andosols in other regions. The nonallophanic and allophanic soils in this area could be distinguished to a large extent by pH(H_2O) and color.

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