Microorganisms that can use carbon dioxide as carbon source and photosynthetic products as energy for photosynthesis and nitrogen fixation. There are many genera and species in cyanobacteria (see Cyanophyta) (such as Nostoc commune and ANABAENA commune). ) and Rhodosporium and Thiobacillus in photosynthetic bacteria.
Chemotactic autotrophic nitrogen-fixing microorganisms
Some chemoautotrophic microorganisms (such as Thiobacillus ferrooxidans) can use carbon dioxide, ferrous oxide and molecular nitrogen as carbon source, energy source and nitrogen source.
Heterotrophic nitrogen-fixing microorganism
Carry out heterotrophic life and use suitable organic carbon compounds as carbon source and energy to meet the needs of life and nitrogen fixation. This eco-physiological group includes many species, such as all genera of nitrogen-fixing bacteria, some species of Bacillus and Clostridium, some genera and species of nitrogen-fixing bacteria, Enterobacteriaceae, sulfide bacteria, methanogens and other heterotrophic bacteria.