Lessivage - Lessivage

Japanese: レシベ化作用 - レシベかさよう(英語表記)lessivage
Lessivage - Lessivage
One of the basic soil formation processes, it is also called mechanical movement of clay. It is a process in which fine clay particles move from the surface of the soil profile in suspension in seepage water without being chemically decomposed, and accumulate in the lower layers. The area where clay accumulates is called the argillic horizon. A prerequisite for the residuization process is that clay particles are dispersed in the seepage water, and therefore it proceeds most strongly when the soil pH is between 6.5 and 5.5.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
基礎的土壌生成作用の一つで,粘土の機械的移動illimerizationともいう。微細な粘土粒子が化学的分解を受けることなく,そのまま浸透水に懸濁して土壌断面の表層から移動し下層に集積する過程。粘土の集積した部位をアルジリック層argillic horizonという。レシベ化作用が生じるためには粘土粒子が浸透水中に分散することが前提条件であり,したがって土壌のpHが6.5~5.5の間の値のときに最も強く進行する。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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