臺灣紅黃色灰化土生成之研究 1.石牌粘土之礦物性質研究

Abstract

1. The Shih-pai clay is the most common soil of hilly land in the northern part of Taiwan. The purpose of this study is to want to know the clay mineral composition of this soil type for the reference of the genesis and practical use of it. 2. Items of this experiment consist of X-ray analysis, thermal differential analysis, thermogravimetric analysis and some chemical analyses which include pH, organic matter, free iron oxide and cation exchange capacity. 3. The results are showing on the tables 1,2,3,4,5, and the figures 1,2,3, etc. 4. It was identified from the beginning that Shih-pai clay could be said as yellow podz olic soils base on the apparent A2 horizon from the profile morphology and the argillic horizon according to the mechanical analysis. (table 1.) 5. From the view of the clay mineral composition (table 5.) of ＜2μ clay fraction. The weathering of these soils are apparently young, because of that the knolinite content is not high and large part of muscovite and vermiculite are still remained in the solum. 6 The A2 horizon that had identified base on the morphology and mechanical analysis was not clear due to its high content of organic matter and free iron oxide. (table 4.) So that the podzolization or the bleaching reaction of this soil was still in the young stage. 7. Data of this study are not enough for the interpretation of the genesis of yellow podzolic soils due to only analyse clay mineral and few chemical and physical properties of the soils. So it is needed to collect some more soil samples and to analyes other physical and chemical properties for the advance study.