1, photoautotrophic, microorganisms belonging to this category all contain photosynthetic pigments, which can use light as energy source and carbon dioxide as carbon source;

2. Photoenergy heterotrophy, in which carbon dioxide is the main or only carbon source, organic matter is the hydrogen donor, and carbon dioxide is reduced to cellular matter by light energy;

3. Chemical energy is autotrophic. This kind of organism takes carbon dioxide or carbonate as the sole or main carbon source and chemical energy released by inorganic oxidation as energy source;

4. Chemical energy is heterotrophic, and organic matter is used as carbon source and energy source for growth.