Pedosphere 8(1): 53--58, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Iron oxides and their relations to colors in some soils of southern China
ZHANG Ming-Kui1, M. J. WILSON2 and HE Zhen-Li1
1 Department of Soil Science and Water Resource, Zhejiang Agricultural University, Hangzhou 310029 (china)
2 Soils and Soil Microbiology Division, Macaulay Land Use Research Institute, Aberdeen, AB9 2QJ (UK)
      Iron oxides from 33 samples of 25 soils derived from various parent materials in the southern China were studied using NaOH selective dissolution technique and X-ray diffraction (XRD). Goethite and hematite were the only two crystalline Fe oxides occurring in a significant quantity. The goethite/(goethite+hematite) ratios ranged from 0 to 1, being the highest in yellow soil, some yellow-red soils and saprolite samples and the lowest in soils derived from purple sandstone where only hematite was present. Al substitution in goethite ranged from 6.6 to 29.9 mol % with a mean value of 16.7 mol %, while substitution of Al in hematite ranged from 0 to 12.1 mol %.The values of Al substitution of hematite in coexisting goethite and hematite were closely related with corresponding values of goethite (r=0.7292, P<0.01, n=27). The redness rating of soils increased linearly with increasing amount of hematite (r=0.8109, P<0.01). It was suggested that redness rating could be used to crudely estimate hematite contents of soils.
Key Words:  Al substitution, color, iron oxides, southern China
Citation: Zhang, M. K., Wilson, M. J. and He, Z. L. 1998. Iron oxides and their relations to colors in some soils of southern China. Pedosphere. 8(1): 53-58.
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