土壌生成因子としての人為(<シンポジウム特集>「人間の作った土壌」-土壌生成と人為-,第21回ペドロジスト・シンポジウム)

概要

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Dokchaev pointed out as soil forming factors as follows : parent materials, climate, plants and animals, age of land and topography (Joffe, 1948). While, in Japan, human activity has been added to them. However, these soil forming factors, especially human activity, are not thought to belong to the same category, and moreover they are indirect factors on soil formation. There has been an idea that soil formation should be divided into two categories : weathering and horizon differentiation. Under the humid and hot condition weathering is often predominant in soil formation but horizon differentiation is poor as in the case of oxisol, vertisol etc. On the contrary, under the humid and cool condition weathering is weak but horizon differentiation is strong as in podsol etc. Direct factors on weathering and horizon differentiation are thought to be as follows : Weathering factors: materials (rock), pressure, water, air (oxygen) temperature Horizon differentiation facors : materials (weathering product), organic matter, water, air (oxygen), temperature When considering the effects of human activities on soil formation, effects on the horizon differentiation become problem. Human activity participates in the soil forming process through their effect upon the process of horizon differentiation.
日本ペドロジー学会の論文
1982-12-31