CLAY MINERALOGY OF THE "TERRA ROXA ESTRUTURADA" SOILS FROM FOREST/SAVANNAH TRANSITION IN THE AMAZON REGION
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概要
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The clay mineral composition of two "terra roxa estruturada" (TRE) soils occurring in the tropical rain forest and tropical forest/savannah transition zone, and a reddish brunizem in the savannah/semi-arid transition zone was studied comparatively in the southeast Amazon region. Kaolin minerals were dominant in these soils, and hematite and goethite were found in the clay fraction. A small amount of 2 : l-type clay minerals was found in two soils. The mineral composition of the clay fraction in the TRE soils was hardly influenced by the difference of the meteorological factor or their water condition in this region, and this factor should not control the influence of parent materials derived from basic rocks. The TRE soils were developed under the condition of laterite genesis, and were regarded clay-mineralogically as a kind of the lateritic soils.
- 社団法人日本土壌肥料学会の論文
著者
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KITAGAWA Yasuo
National Institute of Agricultural Sciences
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MOLLER Maria
EMBRAPA-CPATU (Humid Tropical Research Center)
関連論文
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- PREPARATION OF DIOCTAHEDRAL VERMICULITE FROM MUSCOVITE
- COMPARATIVE CLAY MINERALOGY OF THE "TERRA ROXA ESTRUTURADA" SOIL IN THE AMAZON REGION
- AN ASPECT ON INTERLAYER POTASSIUM OF MICA MINERALS IN SOILS
- CLAY MINERALOGY OF THE "TERRA ROXA ESTRUTURADA" SOILS FROM FOREST/SAVANNAH TRANSITION IN THE AMAZON REGION
- KAOLIN MINERALS IN THE AMAZON SOILS
- A Note on the Aggregates Occurring in Volcanic Ash Soils
- SUBSTITUTION OF ALUMINUM BY IRON IN ALLOPHANE
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- A SHORT DISCUSSION ON THE CHEMICAL COMPOSITION OF ALLOPHANE BASED ON THE DATA OF YOSHINAGA IN 1966
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- DETERMINATION OF ALLOPHANE AND AMORPHOUS INORGANIC MATTER IN CLAY FRACTION OF SOILS : II. Soil Clay Fractions
- SPECIFIC GRAVITY OF ALLOPHANE AND VOLCANIC ASH SOILS DETERMINED WITH A PYCNOMETER