摘要
本文研究了成都平原发育于岷江冲积物、紫色土沉积物和黄壤残积物三种不同母质的六个主要水稻土剖面中各种形态氧化铁含量及其在剖面中的分异特点,探讨了各种形态氧化铁之间的关系及其与环境条件、成土母质的关系。此外,根据全铁含量在剖面中的分异,讨论了发生层的形成。
Six paddy soils derived from three different parent materials were sampled from the Chengdu Plain which was one of the most important rice-growing regions in China to study the characteristics of the differentiation of iron oxides in various forms and its relation to the formation of the specific genetic horizon. The results showed that the extent of the variation of iron oxides in various forms in the paddy profiles studied decreased in the following order: amor. iron oxide>free iron oxide>total iron.It was revealed that the content of total iron was closely related to the parent material from which the paddy soil was derived, and the content of free iron was positively linearly related to the content of total iron in the paddy soil, which suggested that it was also related to the parent materials to some extent, but the content of amor. iron oxide was greatly influenced by the environmental conditions.As to the degree of freeness of iron oxide and activation degree of free iron oxide which were two important parameters used to describe the alteration of iron oxide, it was shown that both of them varied significantly among different horizons in profile, and the former was remarkedly influenced by the soil-forming process while the latter was significantly positively correlated to the conent of organic matter of soil within a given range. When the content of organic matter was beyond a definite value, the activation degree of free iron oxide was mainly influenced by other factors, such as the content of water and the decomposition intensity of organic matter.The differentiation of iron oxide in soil played an important role in the formation of paddy soil. Based on the variation of iron content of different horizons in the soil, we found that the formation of the W horizon which was an important genetic horizon in the profile of paddy soil was due to the eluviation and illuviation of iron for the paddy soil derived from the alluvium from the Minjiang River and yellow earth residual deposit and the local differentiation of iron for the paddy soil derived from purplish soil deposit.
出处
《土壤学报》
CAS
CSCD
北大核心
1992年第2期190-198,共9页
Acta Pedologica Sinica
关键词
水稻土
氧化铁
形态转化
分异
Iron oxide, Form and transformation, Differentiation, Genetic horizon
