摘要：

A survey of the literature pertaining to soil fats, waxes, and resins (often called bitumens or simply lipids) indicates that these substances are probably the least studied of soil organic matter components. Soil organic matter chemists have largely ignored these materials in preference to studies on the true humic materials. This neglect is probably based on the fact that fats, waxes, and resins comprise but a small percentage of the total organic matter of mineral soils (1 to 5%). However, 10 to 20% of the total organic matter of organic soils may come under the lipid classification. Three review articles deal with the soil lipid fraction:H OWARD and H AMER [1960], S TEVENSON [1966], and M ORRISON [1969]. W OLLRAB and S TREIBL [1969] also review the literature on peat and lignite waxes.

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