3种水质调控方式下刺参池塘初级生产力的周年变化

通过对自然纳潮、微孔曝气、养水机池塘不同水层初级生产力及其相关参数的研究,分析养水机对初级生产力的影响。结果表明,3种水质调控方式池塘,初级生产力年均值、P/R值均以养水机池塘最高,微孔曝气池塘次之,自然纳潮池塘最低。养水机池塘、微孔曝气池塘、自然纳潮池塘的初级生产力年均值分别为(6.22±0.54)、(5.37±0.60)、(4.69±0.53) gO_2/(m~2·d)。3种水质调控方式下,养水机池塘30～50 cm水层和50～100cm水层初级生产力差异不显著,而微孔曝气池塘和自然纳潮池塘这两水层之间初级生产力差异显著,且养水机池塘50～100 cm的水层初级生产力显著高于微孔曝气和自然纳潮池塘。研究表明,养水机能显著提高刺参池塘50 cm以下水层的初级生产力,缩小上层和下层初级生产力之间的差距,从而提高池塘水体总初级生产力,为刺参饵料和池塘物质快速循环提供基本保障。

Annual change of primary productivity in Apostichopus japonicus ponds by three water quality regulations

The traditional water quality regulations could not break up thermocline and inhibit macroalgae growth, which result in poor water quality and Apostichopus japonicus growing poorly and even death. Jet water mixing (JWM) can break up thermocline and inhibit the growth of macroalgae. To study the purification efficiency and mechanism of JWM, the primary productivity in the ponds with a jet water mixer (JWM), a submerged aerator (SA) or without any artificial mixing (control) were studied. The results showed that the annual average primary productivity and P/R values of the pond with JWM were the highest, followed by SA pond, and the lowest in the pond without any artificial mixing (control). The mean annual primary productivity in the ponds with JWM, SA and Control pond were 6.22±0.54, 5.37±0.60 and 4.69±0.53 gO₂/(m²·d), respectively. The primary productivity in the ponds decreased with the depth of water. There was no significant difference in primary productivity between 30-50 cm water layer and 50-100 cm water layer in JWM pond, while there was significant difference between the SA pond and Control pond (P<0.05). In addition, the primary productivity of the water layer of 50-150 cm in JWM pond was significantly higher than that of the SA and control pond (p<0.05) from June to September. Conclusion: compared with SA facility, JWM can improve significantly the primary productivity of the lower water layer, which can significantly improve the total primary productivity of the pond and facilitate the rapid circulation of the pond substances.