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Universally improving effect of mixed electron donors on the CO_2 fixing efficiency of non-photosynthetic microbial communities from marine environments

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Journal of Environmental Sciences 2014年第8期26卷 1709-1716页

作者： Jiajun Hu Lei Wang Shiping Zhang Yuanqing Wang Fangming Jin Xiaohua Fu Huirong Li School of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji University Low-Carbon Conversion Science and Engineering Center Shanghai Advanced Research InstituteChinese Academy of Sciences School of Environmental Science and Engineering Shanghai Jiao Tong University Polar Research Institute of China

The universality of improved CO2 fixing upon the addition of mixed electron donors（MEDs）composed of Na2 S,NO2-,and S2O32-to non-photosynthetic microbial communities（NPMCs）obtained from 12 locations in four oceans of the world was validated. The CO2 fixing efficiencies of NPMCs were universally enhanced by MED compared with those obtained using H2 alone as electron donor,with average increase of about 276%. An increase in microbial inoculation concentration could increase the net amount of CO2 fixing to853.34 mg/L in the presence of MED. NO2-and S2O32-may play the roles of both electron acceptor and electron donor under aerobic conditions,which may improve the energy utilization efficiency of NPMC and enhance the CO2 fixation efficiency. The sequence determination of 16 S ribosomal deoxyribonucleic acid（rDNA） from 150 bacteria of NPMC showed that more than 50% of the bacteria were symbiotic and there were many heterotrophic bacteria such as Vibrio natriegens. These results indicate that NPMC acts as a symbiotic CO2 fixing system. The interaction between autotrophic and heterotrophic bacteria may be a crucial factor supporting ladder utilization and recycling of energy/carbon source.

关键词： non-photosynthetic microbial community Mixed electron donors CO2fixing Symbiotic bacteria Heterotrophic bacteria

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