STUDY ON CLAY MINERALOGICAL CHARACTERISTICS OF CALCAREOUS AND NONCALCAREOUS SOILS OF BANGLADESH

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概要

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• Clay mineralogical compositions of calcareous and noncalcareous floodplain soils which are most widely distributed over Bangladesh were investigated. The calcareous soils formed over the Gangese sediments are more alkaline having high extractable bases than the noncalcareous soils of the Bahmaputra sediments. The compositions of clay minerals of both the soils were constituted mainly of 14,10 and 7Å components. Of them, mica was commonly observed abundantly with the smaller amounts of kaolinite, chlorite and the interstratified minerals of these components. Especially, the noncalcareous soil clays were dominated by mica. The main characteristics for both the soil groups were observed in the 14Å constituents, i.e. the calcareous soil clays were smectitic and the noncalcareous were vermiculitic. The noncalcareous soil clays were characterized by the absence or very low contents of smectite and the high contents of vermiculite, while, the calcareous clays always contained considerable amounts of smectite with a trace to moderate amounts of vermiculite. Moreover the relative high contents of hydroxy-Al interlayering components were existed in all clays and they were identified as Al-vermiculite in the noncalcareous soils and Al-smectite in the calcareous soils. It was considered that smectite in the calcareous soils and vermiculite in the noncalcareous soils were inherited principally from their parent sediments of the Ganges and the Brahmaputra, respectively, followed by pedogenetic process to form hydroxy-Al polymer in their interlayer.

• 日本粘土学会の論文

著者

• Alam Md.lutfe

  Laboratory Of Soils United Graduate School Of Agricultural Science Kagoshima University

• SHINAGAWA Akio

  Laboratory of Soil Science

• MIYAUCHI Nobufumi

  Laboratory of Soil Science

• Miyauchi N

  Kagoshima Univ. Kagoshima Jpn

• Shinagawa A

  Laboratory Of Soils United Graduate School Of Agricultural Science Kagoshima University

• Miyauchi Nobufumi

  Laboradtory Of Soil Science

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