Interactions of Biogeochemical Cycles in Terrestrial Ecosystems

The typical ratios between essential nutrients in the plant biomass of the World s terrestrial ecosystems are shown in Table 2. 

Taking into account the limiting role of phosphorus in many terrestrial ecosystems (see Chapter 3, Section 4), the ratio between various elements is calculated 

Element source Substrate/product Electron donor Type of organisms 

CO2 CQ2/ACC0A H2. H2S, 8. S2O32- Green photosynthetic bacteria, anaerobic bacteria 

Calvin-Benson or three-carbon pathway catalyzed by ribulose biphospahate carboxilase oxygenase (Rubisco) 

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