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依据辽宁丹东东港地区的实验池塘中缢蛏(Sinonovacula constricta)实际放养密度,设置了0、30、60、90和120 ind·m-25个密度梯度,采用实验生态学方法室内模拟研究了放养密度对缢蛏单养系统水质的影响。结果表明:放养密度对溶解氧(DO)、硝态氮(NO3--N)、亚硝态氮(NO2--N)、活性磷(PO43--P)及总磷(TP)含量的影响极显著(P<0.01),对铵态氮(NH4+-N)含量的影响不显著(P>0.05);其中,DO、NO3--N及NO2--N含量随缢蛏放养密度的增加而减小,PO43--P及TP含量随缢蛏放养密度的增加而增大;缢蛏放养密度相对较高的实验组(90和120 ind·m-2)明显促进了底泥沉积物中P的循环和再生,同时提高了水中营养物质N的利用率,有效控制NO2--N及NH4+-N等有害物质的含量;在实际养殖中可以按照90~120 ind·m-2的密度放养,并且加强对池塘水质的管理。
According to the actual stocking density of Sinonovacula constricta in experimental ponds in Dandong, Donggang, Liaoning Province, 0, 30, 60, 90 and 120 ind · m-25 density gradients were set up and the experimental ecological models were used to study the effects of stocking density缢 蛏 Monoculture system water quality impact. The results showed that the effects of stocking density on DO, NO3 - N, NO2 - N, PO43 - P and TP contents (P <0.01), and had no significant effect on the content of ammonium nitrogen (NH4 + -N) (P> 0.05). The content of DO, NO3 - N and NO2 - N decreased with the increase of stocking density The content of PO43 - P and TP increased with the increase of stocking density. The experimental group (90 and 120 ind · m - 2) with relatively high stocking density significantly promoted the cycling of P in sediment and Regeneration, at the same time improve the utilization of N in water, effectively control the content of NO2 - N and NH4 + -N and other harmful substances; in actual farming, it can be stocked at the density of 90 ~ 120 ind · m-2, Pond water quality management.