『Abstract
Soil weathering is recognizable through study on physico-chemical
characteristics of soil. In this study, Parker,([(Na)a/0.35] + [(Mg)a/0.9]
+ [(K)a/0.25] + [(Ca)a/0.7])×100,
and Product, [SiO2/(TiO2
+ Fe2O3 + SiO2
+ Al2O3)]×100, weathering
indexes, originally developed for study on rocks, were tested
on Yellow Brown Forest soils from two different regions in Japan.
The results showed that the contribution of the mentioned indexes
can be used for study on soils weathering. In other word, in a
two-dimensional coordination system where the axes are Parker
and Product indexes, regarding to the chemical bases of the indexes,
initial and lateral products of weathering can be tracked at the
same time.
Additionally, the indexes relations with soil color were studied
after exposing the samples at a high temperature. Remarkable relationships
between a */b * ratio-parameters
of psychometric chromaticness of color in CIE color standard system-and
these two weathering indexes demonstrated that a */b
* ratio can be applied reliably to estimate the quantities
of Parker and Product indexes in Yellow Brown Forest soils.
Keywords: Parker index; Product index; Soil color; Soil weathering』
1. Introduction
2. Area descriptions, material and methods
3. Results and analyses
4. Discussion and conclusions
Acknowledgements
References