title: [Allelopathy of Hydrodictyon reticulatum on Microcystis aeruginosa and its removal capacity on nitrogen and phosphorus].
abstract: The effects of liquid culture after cultured with Hydrodictyon reticulatum on the growth of Microcystis aeruginosa were investigated by measuring the D680 value 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 D680 value 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.
authors.affiliation: Research Academic of Energy and Environmental Studies, North China Electric Power University, Beijing 102206, China. zhaokunv@163.com
authors.forename: Kun
authors.initials: K
authors.lastname: Zhao
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Fu
authors.forename: Tian
authors.initials: T
authors.lastname: Chai
authors.forename: Ming-Zhen
authors.initials: MZ
authors.lastname: Zhang
authors.forename: Zhi-Feng
authors.initials: ZF
authors.lastname: Liu
authors.forename: Xiu-Juan
authors.initials: XJ
authors.lastname: Chen
authors.forename: Ming
authors.initials: M
authors.lastname: Hou
authors.forename: Peng-Cheng
authors.initials: PC
authors.lastname: Xu
mesh_terms: D018920:Coculture Techniques; D046508:Culture Techniques; D058086:Microalgae / Q000378:metabolism* / Q000502:physiology; D046931:Microcystis / Q000187:drug effects* / Q000254:growth & development; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D010675:Pheromones / Q000096:biosynthesis / Q000494:pharmacology*; D010758:Phosphorus / Q000302:isolation & purification / Q000378:metabolism*; D014873:Water Pollutants / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D010675:Pheromones; D014873:Water Pollutants; D010758:Phosphorus; D009584:Nitrogen