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本文探讨了南亚热带丘陵湿润铁铝土结构退化过程特征及其机理。结果表明，与地带性自然植被下丘陵湿润铁铝土比较，次生植被或人工植被下丘陵湿润铁铝土结构退化现象明显。表现在表土砂化，即砂粒含量相对增加，粘粒含量相对减少；土壤结构稳定性下降，主要体现在较大粒径水稳性团聚体减少；土壤孔隙性变差，主要体现在容重增加和较大孔径的孔隙减少。对自然湿润铁铝土而言，容重增加、较大孔隙减少更为明显；对耕型湿润铁铝土而言，土壤结构稳定性下降，表土砂化更为突出。数理统计分析结果表明，养分贫瘠化，特别是有机质减少，是丘陵湿润铁铝土结构退化的主要内在因素。
This paper discusses the characteristics and mechanism of the degeneration process of moist ferro-aluminous soil in the southern subtropical hilly region. The results showed that compared with the wet ferroalloys in the hilly natural vegetation, the degeneration of moist ferroalloys in the hilly or hilly area of secondary vegetation or artificial vegetation was obvious. The results show that in the topsoil sandification, that is, the sand content is relatively increased, the clay content is relatively decreased, the soil structure stability is decreased, which is mainly reflected by the decrease of the larger particle size water-stable aggregates and the poor soil porosity. Pores with larger pores decrease. For natural wet ferroalloys, the bulk density increased, the larger pores decreased more obviously. For the cultivated wet ferroalloys, the stability of soil structure decreased and the surface sand was more prominent. The results of mathematical statistics show that nutrient depletion, especially the decrease of organic matter, is the main internal factor of the degradation of moist iron-bearing bauxite structure.