褐色森林土・黄褐色森林土・赤色土における遊離酸化鉄の存在状態について

概要

論文の詳細を見る
The interrelations among iron contents extracted with acid ammonium oxalate (Fe_0), dithionite-citrate-bicarbonate (Fe_d) and total iron (Fe_t) were investigated for Brown Forest, Yellow-Brown Forest and Red soils of Japan. These three genetic soil types can be differentiated by the activity ratio (Fe_0/Fe_d) as well as the ratio (Fe_d-Fe_0)/Fe_t, and it was proposed by the author to designate the latter ratio as "crystallinity ratio" of free iron oxides. The results were as follows: Fe_0/Fe_d (Fe_d-Fe_0)/Fe_t Brown Forest soils; ≳0.4 ≲0.5 Yellow-Brown Forest soils; ≲0.4 ≲0.5 Red soils; ≲0.4 ≳0.5 Comparison of the values of these two ratios with those of Brown Forest, Yellow-Brown and Yellow soils of Gruziya in USSR and those of Yellow-Brown earths of New Zealand showed that the Yellow-Brown and Yellow soils of western Gruziya and the Northern Yellow-Brown earths of New Zealand are similar in the features of free iron oxides to the Yellow-Brown Forest soils of Japan. Considering the similarity in bio-climatic conditions of these three regions, it may be concluded that these soils may belong to the same climatic genetic soil type developping under the warm-temperate lucidophyllus (laurel) forest climate.
日本ペドロジー学会の論文
1973-12-30