Chemical composition and trophic state of shallow saline steppe lakes in central Asia (North Kazakhstan)

Emil Boros, Laura Jurecska, Enikő Tatár, Lajos Vörös, Marina Kolpakova

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The purpose of this study was to identify the prevailing chemical composition and trophic state of the shallow saline steppe lakes of North Kazakhstan along a wide size range (< 1–454 km2) and salinity gradient (2–322 g L−1) on a large spatial scale (1000 km), taking into account the potential effects of human disturbances. Water depth, Secchi disk transparency, temperature, pH, electric conductivity, major ions, total dissolved solids, total organic carbon, total nitrogen and phosphorus, nitrate, soluble reactive phosphorus, and chlorophyll a were measured. The equivalent percentage of major ions, Spearman rank correlation, multivariate analyses, equilibrium state of lakes, and spatial GIS autocorrelation were calculated. The impact of human disturbances (settlements, farms, and mines) on total organic carbon, nitrogen, phosphorus, and chlorophyll a were tested by Kruskal-Wallis ANOVA. The most common combinations of dominant ions were Na-Cl>SO4 and Na-Cl (n = 16; 64%); the Ca, Mg, HCO3, and SO4 ions precipitate with increasing salinity (2–322 g L−1); and ion composition shifts from Na>Mg-Cl>SO4 to Na-Cl. The most of the chemical variables positively, but chlorophyll a negatively, correlated with total dissolved solids, and the total phosphorus had no significant correlation with any variables. The trophic state of these lakes in most cases exceeded the hypertrophic level. The increase in salinity causes change in chemical composition and effects on the phytoplankton development independently from the size of water surface, and the human disturbances had negligible effect on the trophic state of shallow saline lakes in this region of Kazakhstan.

Original languageEnglish
Article number546
JournalEnvironmental Monitoring and Assessment
Issue number11
Publication statusPublished - 1 Nov 2017


  • Human disturbance
  • Hypertrophy
  • Large spatial scale
  • Salinity
  • Total organic carbon

ASJC Scopus subject areas

  • Environmental Science(all)
  • Pollution
  • Management, Monitoring, Policy and Law

Fingerprint Dive into the research topics of 'Chemical composition and trophic state of shallow saline steppe lakes in central Asia (North Kazakhstan)'. Together they form a unique fingerprint.

Cite this