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Volume 33 Issue 2
Jun.  2014
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Article Navigation >  CARSOLOGICA SINICA  > 2014  >  33(2): 123-128
HU Qing-jing, WANG Pei, HUA Lei, CAO Jian-hua, LI Qiang. Utilization of karst water HCO3-, Ca2+ by Chlorella vulgaris under different Cd2+ concentrations stress[J]. CARSOLOGICA SINICA, 2014, 33(2): 123-128.
Citation: HU Qing-jing, WANG Pei, HUA Lei, CAO Jian-hua, LI Qiang. Utilization of karst water HCO3-, Ca2+ by Chlorella vulgaris under different Cd2+ concentrations stress[J]. CARSOLOGICA SINICA, 2014, 33(2): 123-128.
shu

Utilization of karst water HCO3-, Ca2+ by Chlorella vulgaris under different Cd2+ concentrations stress

  • 1.

    Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics,MLR & GZAR；School of Environment, Guangxi University

  • 2.

    Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics,MLR & GZAR；School of the Earth Sciences and Resources, China University of Geosciences (Beijing)

  • 3.

    Jingzhou Water Affairs Group Company Limited

  • 4.

    Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics,MLR & GZAR

  • Received Date: 2014-03-03
  • Publish Date: 2014-06-25
    Abstract
  • The carbon sink effect of algae is a hot topic in global carbon sink research. At the end of 2012, the Longjiang river cadmium pollution event greatly harmed downstream aquatic life. In order to study the effect of cadmium pollution on the algae carbon sink effect, this experiment explored the HCO3- and Ca2+ in karst water used by Chlorella vulgaris cultivated in a closed system under the stress of different Cd2+ concentrations (0, 10, 20, 40 μmol/L), as well as changes to pH and the biomass of Chlorella vulgaris in the system. The results indicated that HCO3- and Ca2+ utilization by Chlorella vulgaris photosynthesis is essentially unchanged when the Cd2+ concentration is in the range of 0 μmol/L to 10 μmol/L. When the Cd2+ concentration is 10-40 μmol/L, the use of HCO3- and Ca2+ in karst water by Chlorella vulgaris is inhibited. When the Cd2+ concentration exceeds 40 μmol/L, Chlorella vulgaris essentially doesn’tuse the HCO3- and Ca2+ in the closed system. Furthermore, pH drift experiments show that when the Cd2+ concentration is in the 0 μmol/L to 20 μmol/L range, Chlorella vulgaris can simultaneously use the free CO2 and HCO3- in karst water for photosynthesis. But when the Cd2+ concentration is between 20 μmol/L and 40 μmol/L, Chlorella vulgaris only uses free CO2 as the carbon source. Therefore, the cadmium pollution in karst aquatic ecosystem has a pronounced impact on the algae carbon sink. 

     

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