水网藻对铜绿微囊藻的化感作用及对氮磷去除能力研究

通过测定藻液D680和叶绿素a浓度,研究了水网藻种植水对铜绿微囊藻生长的影响,探讨了在分离培养和共生培养2种条件下水网藻对铜绿微囊藻的抑制作用,并考察了水网藻对氮磷的去除能力.结果表明,水网藻对铜绿微囊藻有较强的抑制作用,在水网藻种植水作用8 d后,铜绿微囊藻死亡率达92%;不同浓度的水网藻对铜绿微囊藻的抑制作用不同,...

Allelopathy of Hydrodictyon reticulatum on Microcystis aeruginosa and Its Removal Capacity on Nitrogen and Phosphorus

The effects of liquid culture after cultured with Hydrodictyon reticulatum on the growth of Microcystis aeruginosa were investigated by measuring the D₆₈₀value and the chlorophyll-a content of M. aeruginosa. The inhibitory effects of H. reticulatum on M. aeruginosa were studied in both isolated culture and co-culture conditions. Nitrogen and phosphorus removal capacity of H. reticulatum was also tested. Results showed that H. reticulatum could inhibit the growth of M. aeruginosa obviously. After treated by the liquid culture after cultured with H. reticulatum for 8 days, the mortality rate of M. aeruginosa reached 92%. The inhibitory effects of H. reticulatum at different concentrations on M. aeruginosa were different. The strongest inhibitory effect occurred with 3 g/L H. reticulatum in the isolated culture as the D₆₈₀value reduced from 0.1 to 0.004 in 10 days, and it occurred with 4 g/L H. reticulatum in the co-culture as the suppression ratio was 96%. Comparing the large-scale death time for cells under these two conditions, the inhibitory effects of H. reticulatum in the isolated culture were stronger than those in the co-culture. The concentrations of nitrogen and phosphorus decreased sharply under both conditions, which showed that H. reticulatum had removal capacity on nitrogen and phosphorus. The decrease speed of nitrogen and phosphorus concentrations positively correlated to the concentrations of H. reticulatum. The highest decrease of nitrogen and phosphorus were 93.4 mg/L and 4.58 mg/L in 10 days, respectively.