塘田联作对池塘水质及罗氏沼虾生长的影响

Effects of pond-paddy field aquaponics on water quality and growth of Macrobrachium rosenbergii

  • 摘要: 为探索节能减排的池塘养殖新模式,开展了罗氏沼虾 (Macrobrachium rosenbergii)-水稻塘田联作试验。以罗氏沼虾-水稻联作试验塘和罗氏沼虾单养对照塘各1口为研究对象,监测池塘的主要水环境因子动态及罗氏沼虾生长指标,分析塘田联作模式对池塘水质及罗氏沼虾生长的影响。试验塘被改造为养殖区与稻田两部分以模拟塘田联作,每部分面积各占50%。水稻于2018年4月22日机栽完毕,5月12日放养虾苗,6月28日起进行水质和生长监测。结果显示:1) 试验期间试验塘平均水温比对照塘低0.82 ℃;2) 试验塘水体无机氮 (NH4 +-N、NO2 -N、NO3 -N)、活性磷酸盐-磷 (PO4 3−-P)、总悬浮颗粒物 (TPM)、颗粒有机物 (POM)、颗粒无机物 (PIM) 浓度、化学需氧量 (COD) 和变异系数 (CV) 在整个养殖期间均低于对照塘,且NH4 +-N、COD与对照塘差异显著(P<0.05),而对照塘对应水质指标在养殖后期均出现大幅升高;3) 试验塘特定生长率和增重率分别为3.07%·d−1和459.40%,而对照塘分别为2.86%·d−1和397.44%。结果表明,塘田联作能降低夏季高温期池塘水温及水体氮 (N)、磷 (P) 浓度与COD,并保持水质稳定,促进罗氏沼虾的生长。

     

    Abstract: In order to develop a new pond farming model with characteristics of energy saving and emission reduction, a Macrobrachium rosenbergii pond-paddy field aquaponics experiment was carried out. The dynamics of major water environment factors and the shrimp growth were monitored in a trial pond (combined with paddy field) and the control pond (M. rosenbergii monoculture). The effects of this new farming model on the water quality and growth of M. rosenbergii were analyzed. The trial pond was transformed into two parts (aquaculture area and paddy field), and each part amounted 50% of the area. The rice was planted on April 22, 2018, and the shrimps were seeded on May 12. Sampling and monitoring began on June 28. The results show that: 1) The average water temperature of the trial pond was 0.82 °C lower than that of the control pond. 2) The concentrations and variation coefficients of ammonium nitrogen (NH4 +-N), nitrate nitrogen (NO3 -N), nitrite nitrogen (NO2 -N), active phosphate phosphorus (PO4 3−-P), total particulate matter (TPM), particulate organic matter (POM), particulate inorganic matter (PIM) and chemical oxygen demand (COD) in the trial pond were all lower than those in the control pond with significant difference (P<0.05). The values of these water quality parameters in the control pond showed instant increase with high amplitude at the later stage of the trial period. 3) The specific growth rate and relative growth rate of M. rosenbergii body mass in the trial pond were 3.07%·d−1 and 459.40%, respectively, while those in the control pond were 2.86%·d−1 and 397.44%, respectively. The results indicate that shrimp pond-paddy field aquaponics can reduce the pond water temperature in summer, reduce the nutrient concentrations and chemical oxygen demand significantly, maintain water quality stable, and promote better growth of M. rosenbergii.

     

/

返回文章
返回