题目内容

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

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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 ______ .

The purpose of soil classification is to clarify the law of soil development under the influences of natural factors and human factors during which the dominant and secondary processes of soil development and evolution are revealed. At last, the relationships among soil forming conditions, processes and soil properties are demonstrated. Thus, a soil classification system is developed.

Soil classification is a unified system of soil. Each soil can have a place in the system and there's only one place for each soil.

Soil individual is a three-dimensional entity in natural landscape, characterized by certain position, size, slope, look, horizons and basic properties. It is composed of a group of single pedons with statistical similarity in a certain area.