红壤结构的稳定性及其在土壤分类上的意义

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.

STABILITY OF THE STRUCTURE OF RED EARTHS AND ITS SIGNIFICANCE IN SOIL CLASSIFICATION

The experiment results in this report are summariued as follows:1.Both of the reduction treatments (with glucose) and chelatim 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-dithionitc:solution)could activate and remove a large amount of Fe₂O₃ and Al₂O₃ and strongly deteriorated the soil structure.