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在研究的红壤类土壤样品中普遍存在着针铁矿的铝同晶替代作用,供试样品中针铁矿铝替代量为0.14％～27.21％(摩尔百分数),平均为8.77％。红壤亚类、黄红壤亚类和黄壤亚类平均依次为10.32％、9.79％、1.30％,其中红壤、黄红壤亚类与黄壤亚类之间差异明显,这反映了成土条件的差异。土壤中针铁矿的铝替代量与粘粒中铁的游离度正相关,与土壤粉砂粘粒比负相关,说明针铁矿中铝替代量随土壤发育的增加而增加。
In the red earth soil samples studied, the replacement of goethite with aluminum isomorphous occurs. The replacement amount of goethite in the tested samples is 0.14% ~ 27.21%, with an average of 8.77%. The average percentages of red soil, yellow-red soil and yellow soil were 10.32%, 9.79% and 1.30%, respectively. The differences between red soil, yellow-red soil and yellow soil were significant, which reflected the difference of soil-forming conditions. The amount of aluminum substituted by goethite in soil is positively correlated with the freeness of iron in the clay and negatively correlated with the clay of the silt, indicating that the replacement amount of aluminum in the goethite increases with the development of the soil.