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连续九年施用有机肥料，紫色水稻土土壤及＜０．００２ｍｍ的有机无机复合体中无定形铁、铝和络合态铁、铝的含量呈不同程度的增加，络合态铁和铝间具拮抗作用（ｒ＝０．７９９８￣＊ｎ＝７）；土壤的有机质含量增加主要是由于轻组有机质含量增加，而有机无机复合度下降，土壤重组腐殖质的含量为０．２５—０．０１ｍｍ＞＜０．００２１ｍｍ＞１—０．２５ｍｍ＞０．０１—０．００２ｍｍ；有机无机复合度及重组腐殖质中松结态与紧结态的比值随粒径的增大而下降，其平均复合度明显低于土壤，土壤中松结态腐殖质结合的铁的含量和Ｆｅ／Ｃ比值具有增加趋势，而铝的含量和Ａｌ／Ｃ比值恰相反；其中胡敏酸结合的铁铝含量比富里酸低；复合体中松结态腐殖质结合的铁铝含量与有机碳含量的顺序相一致。
For nine consecutive years of application of organic fertilizers, the content of amorphous iron, aluminum and complexed iron and aluminum in purple paddy soils and organic and inorganic composites <0.002mm increased with different degrees, (R = 0.7998 ~ * n = 7). The increase of organic matter content in soil was mainly due to the increase of organic matter content in light fraction and the decrease of organic-inorganic complex content. The content of soil reorganized humus was 0.25-0.01mm> <0.0021mm> 1-0.25mm> 0.01-0.002mm. The ratio of organic to inorganic complex degree and the ratio of loose to tight state decreased with the increase of particle size, and the average degree of complexation was significantly lower In soil and soil, the content of loosely bound humus-bound iron and the ratio of Fe / C showed an increasing trend while the content of Al and C / Al were just the opposite. The content of iron-aluminum combined with humic acid was lower than that of fulvic acid. The content of iron and aluminum in the loosely coupled humus is consistent with the order of organic carbon content.