西南红壤和黄壤游离氧化物初探

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。

AH ELEMENTARY STUDY ON THE FREE CONTENT OF RED AND YELLOW EARTH IN SOUTHWESTERN DISTRICT OF CHINA

To Study the free oxide on the surface of red and yellow earth develloped under the humid bio-climate in southwesern of China is of importance not only in the use and improvement of those soils but also in the explanation of their development history. The obtained data from this study show the free oxide content and change on the surface of red and yellow earth have a similar pattern to that of red earth in southern and central China。The relationship between free oxide and soil development in south western district of China is also discussed in this paper。