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土壤圈(英文版)
1998,8
(1)
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Pedosphere
1998,8
(1)
Iron oxides and their relations to colors in some soils of southern China
作 者：
ZHANG MINGKUI;M. J. WILSON;HE ZHENLI
单 位：
angeaSystems.com;Department of Soil Science and Water Resource, Zhejiang Agricultural University, Hangzhou 310029 (China)
关键词：
al substitution;color;iron oxides;southern china
摘 要：
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.
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