题目内容

A well-developed natural soil is composed of three basic horizons: the eluvial horizon (A horizon), the illuvial horizon (B horizon) and the parent material horizon (C horizon).

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The podzoliation process refers to the leaching of sesquioxides and deposition of silicon dioxide in the subsurface soil layer.

Gleyization occurs when the soil perched-water zone is constantly moving upward and downward, alternation of drying and wetting is more obvious. The alternation of oxidative and reductive reactions in soil is induced repeatedly. The result is formation of mottling, spot, iron/manganese concretion, or red coating.

The argillization process refers to the formation and accumulation of clay minerals in soil.

Human activities have beneficial effects on soil; it always contributes to the development of soil fertility.