| Institute of Karst Geology, Chinese Academy of Geological Sciences | Host |
| Citation: |
ZHANG Tao, LI Jianhong, PU Junbing, LI Rui, WU Feihong, LI Li. Experimental study on the utilization efficiency of Chlorella to Ca2+ and HCO3-in karst water[J]. Carsologica Sinica, 2018, (1): 81-90. doi: 10.11932/karst20180104
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Experimental study on the utilization efficiency of Chlorella to Ca2+ and HCO3-in karst water
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Abstract
Chlorella was collected from Dalongdong cave in Shanglin county of Guangxi to study its utilization efficiency of Ca2+ and HCO3-in three water bodies with different concentrations of DIC (4.6 mmol · L-1,2.5 mmol· L-1 and0.5 mmol· L-1) in the closed system.The results show that:(1)After7 days of cultivation in three different DIC solution of 4.6 mmol · L-1、2.5 mmol · L-1 and 0.5 mmol · L-1,Chlorella biomass increased from 0.04 Abs,to 0.56 Abs,0.50 Abs and 0.44 Abs,respectively.In the environment with high HCO3-and Ca2+ concentration,Chlorella absorbed 54.95% of HCO3-in group A and 48.00% of HCO3-in group B,it also absorbed 28.26% of Ca2+ in group A and 24.14% of Ca2+ in group B.In the environment with low HCO3-concentration,it was difficult for Chlorella to absorb HCO3-in group C (0.5 mmol · L-1).These findings indicate that the high concentration of HCO3-in karst reservoirs plays a role of "fertilization" on the growth of Chlorella,which is significant to the karst process-related carbon sink;(2)The amount of Ca2+ deposition caused by Chlorella photosynthesis using HCO3-was higher than the amount of Ca2+ absorbed by Chlorella photosynthesis;(3)Photosynthesis from Chlorella make δ13CDIC positive,while the respiration make δ13CDIC negative in the culture medium.-
Keywords:
- karst reservoir /
- Chlorella /
- carbon sink /
- δ13CDIC /
- Calcium carbonate precipitation
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ZHANG Tao, LI Jianhong, PU Junbing, LI Rui, WU Feihong, LI Li. Experimental study on the utilization efficiency of Chlorella to Ca2+ and HCO3-in karst water[J]. Carsologica Sinica, 2018, (1): 81-90. doi: 10.11932/karst20180104
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