枯草芽孢杆菌和空心菜对鳝虾稻共作池塘水质的影响

The effects of Bacillus subtilis and Ipomoea aquatica Forsk on water quality in the pond for co-farming of rice-crayfish-finless eel

在黄鳝-克氏原螯虾-水稻共作塘中,进行了枯草芽孢杆菌和空心菜改善水质的对比实验。结果表明:枯草芽孢杆菌和空心菜对鳝虾稻共作水体均有较好的净化作用,能提升溶解氧、降低p H。其中,枯草芽孢杆菌处理对氨氮、亚硝酸氮、总氮、总磷的去除效果强于3种密度的空心菜,最高去除率分别达到68.06%、86.49%、49.96%和58.82%;单一投放空心菜时,以20%的密度处理对氨氮、亚硝酸氮、总氮、总磷的去除作用最强,最高去除率分别达到63.00%、88.39%、53.12%和49.02%。综上,鳝虾稻共作池塘搭配枯草芽孢杆菌和20%密度的空心菜为宜。

The contrast experiment was carried out about the effects of Bacillus subtilis and spinach（ Ipomoea aquatica Forsk） on the water quality improvement in the pond during the co-farming of rice-crayfish-finless eel. The results showed that Bacillus subtilis and spinach both improved water quality,increased DO and decreased p H of water. Bacillus subtilis had better effects in the decreasing of the NH^＋_4-N,NO^-_2-N,TN,TP than spinach of three density groups with the highest level of degradation rate by 68. 06%,86. 49%,49. 96%,and 58. 82% respectively. Generally,the spinach with 20% of density degraded the level of NH^4_＋-N,NO^2_--N,TN,TP by 63. 00%,88. 39%,53. 12 and 49. 02% most efficiently. In sum,the combination of Bacillus subtilis and spinach with the 20% density in the pond during the co-farming of the rice-crayfish-finless eel was better.