title: [Effects of salinity and alkalinity on plankton and water chemical factors].
abstract: This paper dealt with the effects of increasing salinity and alkalinity on the chemical and hydrobiological factors in saline-alkaline ponds. The experiment was conducted in Daluhu Aquaculture Company, Gaoqing County, Shandong Province during July and August, 1998. Raw salt and NaHCO3 were used to adjust the salinity and alkalinity. The results showed that increasing alkalinity from HCO3- rsulted in the reduction of pH value, calcium ion concentration and COD in a short term. When alkalinity was increased from 6.64 +/- 0.40 to 13.47 +/- 0.31 mmol.L-1, no significant effect on plankton was observed. However, when salinity was increased from 2.10 +/- 0.22 to 11.29 +/- 0.99 g.L-1, it decreased the plankton biomass, species number and diversity index decreased, and affected the composition of plankton community structure.
authors.affiliation: Aquaculture Opened Laboratory of Ocean University of Qingdao, Qingdao 266003.
authors.forename: Q
authors.initials: Q
authors.lastname: Shentu
authors.forename: S
authors.initials: S
authors.lastname: Dong
authors.forename: W
authors.initials: W
authors.lastname: Zhao
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000818:Animals; D018533:Biomass; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D010933:Plankton / Q000187:drug effects* / Q000254:growth & development; D017693:Sodium Bicarbonate / Q000032:analysis / Q000494:pharmacology*; D012965:Sodium Chloride / Q000032:analysis / Q000494:pharmacology*; D013045:Species Specificity; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D012965:Sodium Chloride; D017693:Sodium Bicarbonate