三种底质改良方式对罗非鱼池塘水质和底质营养物质含量的影响

Effects of Three Sediment Improvement Methods on Water Quality and Sediment Nutrient Content of Tilapia Pond

本实验利用室内模拟法,探究了种植绿狐尾藻(H组)、抛洒底改型微生态制剂(D组)和施用生石灰(S组)对罗非鱼养殖池塘水质和底质营养物含量变化的影响。结果发现:H组对底质中总氮、总磷的去除率最高,分别为32.91%、28.05%。实验期间H组水中的NH+4-N、NH-2-N和TN浓度整体小于其它实验组;S组的NH-2-N和TP浓度显著大于对照组(P +4-N和TN浓度前中期显著大于对照组(P 【0.05);D组的营养盐浓度介于H组与S组之间。研究结果表明,三种底泥改良方式均可降低养殖池塘底泥中的总氮总磷含量,其中种植绿狐尾藻H组对底泥氮磷去除效果最佳,且对水中营养盐浓度几乎无影响,综合修复效果最佳。

In this experiment, the effects of Myriophyllum elatinoides Gaudich (Group H), modified microecological agent (Group D) and quicklime (Group S) on nutrient content in water and sediment of tilapia culture pond were studied by indoor simulation. The results showed that: Group H had the highest removal rate of total nitrogen and total phosphorus in the sediment, which were 32.91% and 28.05%, respectively. During the experiment, the concentrations of NH+4-N、NH-2-N and TN in the water of group H were generally lower than those of other experimental groups. The concentrations of NH-2-N and TP in group S were significantly higher than those in the control group (P +4-N and TN in the early and middle stages were significantly higher than those in the control group (P <0.05). The nutrient concentration of group D was between group H and group S. The results of the study show that the three methods of improving sediment can reduce the total nitrogen and phosphorus content in the aquaculture pond. Among them, the H group planted with Myriophyllum elatinoides Gaudich had the best effect on removing nitrogen and phosphorus from the sediment, and had almost no effect on the concentration of nutrients in the water, and the comprehensive restoration effect was the best.