题目内容

The soluble salts in the soil are transported to the lower layer or leached out of soil when the groundwater level is decreased through precipitation or anthropogenic irrigation, ditch drainage. This process is called desalination.

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In the humid region of the eastern temperate zone, the heat increase from north to south. The soils are distributed in the following sequence: brown soil, dark brown soil, yellow brown soil, yellow soil (red soil) and latosol.

The mechanical composition of the parent material affects the mechanical composition of the soil. The chemical composition of parent material has a significant effect on soil formation, properties and fertility, and it is the primary source of plant mineral elements (except nitrogen) in soil.

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.

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.