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对精养鱼池的淤泥多次采样,经细菌学和化学的测定和分析,结果表明,淤泥中参与氮循环作用的细菌种类和数量以及它们代谢的底物和产物含量有明显的纵向层次变化。淤泥参与池塘氮循环的活性,主要受细菌数量、优势菌的代谢特性、代谢底物以及氧含量等因素相互作用的影响;认为可将专性好气菌的生长情况作为主要参考指标,判断淤泥的活性,据此,水—泥界面至约9cm深处为活性淤泥层,活性层以下深度的淤泥为非活性淤泥层,池塘氮循环的细菌动力学作用主要发生在活性淤泥层。建议生产上通过适当的管理措施,最大限度地保持并挖掘活性淤泥层参与氮循环动力学作用以加速池塘物质循环,提高鱼产量,减缓鱼池淤积。
The results showed that there were obvious longitudinal changes in the types and quantities of bacteria involved in the nitrogen cycle and the contents of substrates and products in their metabolism . The activity of sludge involved in the nitrogen cycle of the pond is mainly affected by the number of bacteria, the metabolic characteristics of dominant bacteria, the metabolic substrate and the oxygen content and other factors. It is considered that the growth of obligate aerobic bacteria can be used as the main reference index to determine the effect of sludge According to this, the active silt layer is formed at the depth of about 9 cm from the water-mud interface, and the non-active silt layer at the depth below the active layer. The bacterial dynamics of the nitrogen cycle in the pond mainly occurs in the active silt layer. It is suggested to adopt appropriate management measures in production to keep and excavate the activated sludge layer to the maximum extent and take part in the nitrogen cycle kinetics to accelerate the material circulation of the pond, increase the fish production and reduce the siltation in the pond.