The invention relates to a
biomass energy utilization and
resource utilization technology, and aims to provide a method for improving the
carbon sequestration capability of
nannochloropsis oculata by domesticating and regulating a key
enzyme with high
ammonium salt. The method comprises the following steps: carrying out
nitrogen salt gradient
domestication on
nannochloropsis oculata cells, and regulating and controlling the expression quantity of five key enzymes, namely H < + > transport ATP
enzyme,
glutamine synthetase,
asparagine synthetase,
carbonic anhydrase and
ribulose-1, 5-diphosphate carboxylase /
oxygenase, in the
nannochloropsis oculata cells; the domesticated and cultured
nannochloropsis oculata can independently use coked
ammonium sulfate as a
nitrogen source required by growth; the domesticated algal strains are subjected to transfer culture, and
verification and screening are carried out aiming at the capability of fixing CO2 in
flue gas and the prevention of over-acidification of the culture medium. According to the method, the utilization of coked
ammonium sulfate by the
nannochloropsis oculata can be enhanced without causing over-acidification of the culture medium, the microalgae culture cost can be effectively saved, and the
flue gas CO2 immobilization capability of the
nannochloropsis oculata is improved; a new thought is provided for large-scale breeding and cultivation by using coked
ammonium sulfate and improvement of economic efficiency.