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应用穆斯堡尔谱和X射线法分析研究红壤性水稻土的氧化铁矿物,研究结果表明,红壤性水稻土的氧化铁矿物组成、特性及其形成转化与起源土壤具有明显的差异。水稻土的成土条件不利于赤铁矿的形成。红壤的粘粒氧化铁矿物以赤铁矿和高铝替代(>20摩尔%)的针铁矿为主。经淹水种稻后,赤铁矿逐渐被转化为低铝替代的针铁矿或其它形态氧化铁。渗育型水稻土P层的赤铁矿含量比相应的母土低,其针铁矿铝替代量较其它水型的水稻土高。而潴育型水稻土W层和潜育型水稻土G层粘粒氧化铁矿物均以针铁矿为主,其铝同晶替代量低(<15摩尔%),且颗粒细小,结晶度较低。这些结果反映了水稻土的成土条件和发生特点,同时对水稻土发生分类具有重要的意义。
The results of Mossbauer spectroscopy and X-ray analysis of iron oxide minerals in red paddy soil showed that there were significant differences in the composition, characteristics and formation and transformation of iron oxide minerals in red paddy soil. Soil conditions for paddy soil are not conducive to the formation of hematite. Red soil clay minerals iron oxide with hematite and high aluminum replacement (> 20 mol%) of goethite mainly. After submerged paddy rice, hematite is gradually converted into goethite or other forms of iron oxide that are substituted by low-aluminum. The hematite content of P layer in infiltration paddy soil was lower than that of corresponding native soil, and the substitution amount of aluminum in goethite was higher than that of other water-type paddy soil. The W layer of paddy-type paddy soil and the G layer of clay-type iron oxide minerals in the paddy-type paddy soil are mainly goethite. The amount of aluminum isomorphous substitution is low (<15mol%), and the grains are fine and crystallinity Lower. These results reflect the soil forming conditions and occurrence characteristics of paddy soils, and are of great significance to the classification of paddy soils.