The origin and classification of soil enzymes are summarized in this paper. The foregone research results discover the close relationship between soil enzyme activity and soil quality (including soil chemical, physical and biological properties), and long-or short-term response of soil enzyme activity to disturbance of soil ecosystem. Meanwhile, soil enzyme activity is sensitive to slightly change of soil quality, which suggests soil enzyme activity can act as one of key indicators for assessment and forecast of soil quality. Some problems in soil enzyme studies are discussed and further possible research of soil enzyme activity is also presented. Ref
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