The Carbon Cycle CO2 in atmosphere Burning Plants,algae, cyanobacteria Plant Animal Fixation respiration respiration Wood and fossil fuels Consumption CH4+CO2 Plants Animals Dissolved Decomposition C02 Photosynthesis Soil and Dead 介 water microbes organisms Aquatic Plants,algae, bacteria cyanobacteria 7 Fossil Dead organisms fuels cudingaquatic anim Figure 27.3
The Carbon Cycle Figure 27.3
The Nitrogen Cycle Free nitrogen gas (N2) (N2)in atmosphere Decomposition Nonsymbiotic 7 Protein Leguminous Azotobacter Industrial from plants Beljerinckia. fixation as dead cells 风 Cyanobacteria. fertilizer Clostridium 0 Fixation (N2O) Decay organisms (aerobic and anaerobic bacteria Symbiotic Denitrifying bacteria and fungi) Rhizobium (Pseudomonas, Bradyrhizobium Bacillus licheniformis. Assimilation Nitrites Ammonia Paracoccus (NO) Ammonification (NH3) denitrificans. Nitrosomonas and others) Key Denitrification Nitrates (NO3) Nitrites Nitrification Ammonification (NOS) Fixation Nitrification Nitrobacter Denitrification Figure 27.4
The Nitrogen Cycle Figure 27.4