题目内容

Because the loess materials are located in a humid region, the calcium carbonates are leached to the bottom soil layer. They accumulate in concretions. It is generally slightly alkaline for the upper soil.

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For deluvial deposits, from the heart of the fan to the edge of the fan, soil texture changes from sandy to clayey with increasing soil fertility.

The physical weathering produces fine fragments in different sizes with different chemical composition as the original rocks, which cover the surface of the rock.

Carbonation refers to the chemical decomposition of rock and minerals under the influence of water and temperature, which leads to the destruction of rock and minerals and the release of trapped nutrients.

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).