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游离铁、铝等氧化物不仅是土壤可变电荷的物质基础,而且是土壤重要表的面活性物质。越来越引起人们的注视,以氧化铁含量作为土壤分类、分层和推测土壤年龄的指标之一。西南红壤和黄壤,处于亚热带气侯条件下,淋溶作用强,土壤风化度深,含有大量的氧化物及游离氧化物,不仅是该区土壤表面特性的重要物质基础,且反映其酸化、脱硅富铝化的程度。在研究西南红壤和黄壤的可变电荷性和固磷特性时,必须了解这类物质在土壤中存在的状态。为此,本文仅就西南红壤和黄壤中氧化物及游离氧化物进行了初步探讨。
Free iron, aluminum and other oxides are not only the material basis of the variable charge of the soil, but also the surface active material of the important table of the soil. More and more people’s attention, with iron oxide content as soil classification, stratification and speculation of soil age indicators. Red soil and yellow soil in Southwest China are characterized by strong leaching, deep weathered soil and large amount of oxides and free oxides in the subtropical climate. It is not only an important material basis for the soil surface characteristics of the area but also reflects its acidification, The degree of silicon aluminization. In studying the variable charge and phosphate fixation properties of red soils and yellow soils in the Southwest, it is important to understand the state of these species in the soil. For this reason, only the oxides and free oxides in the red soils and yellow soils in the southwest of China were studied.