【摘要】 良好发育的红壤,常有一种特殊的稳固结构,它与氧化铁、铝的胶结有关。这种结构经泡水后基本稳定;还原处理或络合处理能致使较多的破坏;还原与络合联合处理能达到最大程度的破坏。从试验中还说明红壤结构的破坏率都与铁、铝溶出量成正相关。铁、铝积聚是红壤化作用的基本特征,与铁、铝直接有关的结构状况,从理论上说,应可作为分类上的参考指标。又因结构状况还受到矿物类型、粘粒含量、酸度等因素的影响,所以还具综合性的意义。同时按田间观察,它在生产上的意义也较大。工作中看到红壤的结构状况,至少可对红壤的发育度、熟化度以及母质因素的影响等做出有规律的反映,这也表明了它在分类上的现实意义。更多还原

【Abstract】 The experiment results in this report are summarized as follows:1. Both of the reduction treatments （with glucose） and chelation treatments （with oxalic acid） could aotivate and remove certain amount of Fe₂O₃ or Al₂O₃ from the soil and deteriorated the soil structure containing macro- and micro-aggregates.2. The reduction-chelation treatments （with citrate-dithionite solution）could activate and remove a large amount of Fe₂O₃ and Al₂O₃ and strongly deteriorated the soil structure.3. Destruction ratio of soil aggregate （Table 2） was closely related with the extracted amount of Fe₂O₃ or Al₂O₃ in the solution in all treatments mentioned above.Theoretically, the sesqui-oxide accumulation is the most important characteristic of the development of red earths. The soil structure which is closely related with the Fe and Al should be a useful criterion in the red earth classification. Moreover, soil structure is always influenced by the composition clay minerals, clay content and acidity of the soil; it is also of great significance in farming practice. It is considered that the structure in red earths may indicate the developmental stage, mellowness of the soils and the influence of parent materials on the soils.更多还原