题目内容

______ is a young soil developed from sandy parent material in arid and semi-arid regions.

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Cinnamon soil is developed in warm temperate region under subhumid continental monsoon climate. Clayification and calcareous leaching/deposition are very obvious. It has a calcic horizon showing clayification and containing calcium carbonate or lime.

The horizontal distribution of soil also shows the same zonal distribution law along the latitudinal zonality of heat and the longitudinal zonality of ______ .

______ are used to identify soil types. They are specific horizons with a series of quantitative indicators.

Chinese soil classification can go back to 1930s. There are three stages of Chinese soil classification systems, namely Marbut’s soil classification system, genetic soil classification system and ______ .