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1·Factors affected on dams were divided into two sections: abiotic factor and biotic factor, and the degree of effects was divided into three grades;

将水坝对河流生态系统的影响因素划分为非生物要素和生物要素两大方面，并根据影响程度划分为三个等级；

2·Microorganism community is a crucial biotic factor, SOM(soil organic material), temperature and moisture are all important abiotic factors that could affect enzyme activity;

微生物群落是影响酶活性的主要生物因素，土壤有机质、温度和湿度等是影响酶活性的重要非生物因素；

3·Plant secondary metabolites is an adaptation of plants to circumstances, and its result of plant interacting with biotic factor and abiotic factor in the permanent evolution.

植物次生物质是植物对环境的一种适应，是在长期进化过程中植物与生物和非生物因素相互作用的结果。