Welcome to Chinese Journal of Ecology! Today is Share:

cje

Previous Articles     Next Articles

The responses of two algal species, Microcystis aeruginosa and Scendesmus quadricauda to ammonium.

DAI Liang-liang1,2, GUO Liang-liang1,2, LI Lu1,2, ZHOU Wei-cheng3, LI Gen-bao1*#br#   

  1. (1State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3Department of Chemistry and Life Science, Xiangnan University, Chenzhou 423000, Hunan, China).
  • Online:2017-08-10 Published:2017-08-10

Abstract: In order to explore the role of ammonium nitrogen (NH4+-N) in the succession of algae communities, we studied the influence of ammonium nitrogen on growth, physiological characteristics and cellular morphology of Microcystis aeruginosa and Scendesmus quadricauda under monoculture and coculture in the laboratory. The monoculture experiments showed that the 5.0-20 mg·L-1 of ammonium nitrogen benefited the growth of M. aeruginosa and S. quadricauda. However, M. aeruginosa was more sensitive to ammonium nitrogen than S. quadricauda. When the ammonium concentration reached 50 mg·L-1, the photosynthetic activity of M. aeruginosa declined from 0.35 to 0.07 on the second day, while that of S. quadricauda declined from 0.63 to 0.47 on the fourth day. With the increase of cultivation period and ammonium concentration, the damage of the plastid of S. quadricauda was aggravated. The twocelled S. quadricauda was more likely to be generated at ammonium concentration equal to or greater than 10 mg·L-1, whereas the fourcelled S. quadricauda was more likely to be generated at ammonium concentration less than 10 mg·L-1. The coculture experiment showed that the 0.5-2.0 mg·L-1 of ammonium was beneficial to the growth of S. quadricauda while 5.0-20 mg·L-1 was beneficial to the growth of M. aeruginosa. These results showed that M. aeruginosa was fit to grow at the high concentration of ammonium nitrogen (5.0-20 mg·L-1), therefore, it may be a good strategy to keep ammonium at low levels (≤2.0 mg·L-1) for control of algal bloom of M. aeruginosa.

Key words: winter wheat, bundled straw covering, soil thermal-moisture, yield, northwest Loess Plateau