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66<br />

Galdino Andrade<br />

Plants<br />

Carbon<br />

Desmineralization<br />

Starch<br />

Celulose<br />

Lignin<br />

Hidrolytic<br />

Activity<br />

Sugars<br />

Carbon<br />

Source<br />

Heterotrophic<br />

Microorganisms<br />

CO2<br />

Organic Acids<br />

Soluble<br />

Inorganic<br />

Phosphate<br />

Carbon Source<br />

N<br />

Desmineralization<br />

Carbon Source<br />

Sulfur<br />

Source<br />

Carbon<br />

Nitrogen<br />

Source<br />

SO4 -2<br />

BIOSPHERE<br />

H2SO4<br />

Insoluble<br />

Inorganic<br />

Phosphate<br />

Phosphatases<br />

Proteins<br />

Mycorrhiza<br />

Fungi<br />

Protozoans<br />

Proteases<br />

Peptidases<br />

Microbial<br />

mineralization<br />

H2S<br />

Excretion<br />

Phosphate<br />

Desmineralization<br />

NH3 +<br />

Plant<br />

Root<br />

NO3 -<br />

Nutrient Uptake<br />

N2<br />

Nitrogen<br />

fixation<br />

Aminoacids<br />

Nitrogen<br />

Desmineralization<br />

Sulfur<br />

mineralization<br />

Nitrification<br />

Sulfate<br />

Reduction<br />

Nutrient Uptake<br />

Organic<br />

Phosphate<br />

Feeding<br />

Bacteria<br />

Organic Acids<br />

Nitric Acid<br />

Nutrient Uptake<br />

Fig. 10. The interaction among functional groups of microorganisms in the carbon,<br />

nitrogen, phosphorus and sulphur cycles

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