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在北方地区,特别是沿黄一带,养殖户大部分采用高密度集约化养殖,池塘底泥由于残饵、鱼类排泄物等的沉积,每年以6~8cm的厚度逐年增加。根据333.3公顷优质鱼类养殖池塘调查结果,95%的池塘底泥厚度大于40cm,其中60%池塘底泥厚度在60~80cm。试验证明,残饵、粪便等沉积于池底对池水和底质均产生明显的影响,使池水的pH值下降,氨氮、亚硝酸盐、硫化物含量上升,底泥的有机质、全氮、铵
In northern areas, especially in the area along the Yellow River, most farmers use high-density intensive farming. Due to the deposition of residual bait and fish excrement, the pond sediment increases annually at a thickness of 6 to 8 cm. According to the survey of 333.3 hectares of quality fish culture ponds, 95% of the pond sediment thickness is greater than 40 cm, of which 60% of the pond sediment thickness is 60-80 cm. Experiments show that bait, feces and other sediments deposited on the bottom of the pool have a significant impact on both the water and sediment, the pH of the pool decreased, ammonia nitrogen, nitrite, sulfide content increased, the sediment organic matter, total nitrogen, ammonium