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In the cycle - Inthecycle'snextstep,...

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In the cycle's next step, photosynthetic sulfur bacteria metabolize the hydrogen sulfide anaerobically.  They oxidize the H 2 S, thereby releasing the sulfur as elemental sulfur (S).  Elemental sulfur  accumulates in the soil. Species of colorless sulfur bacteria, including members of the genera  Thiobacillus, Beggiatoa , and  Thiothrix , also metabolize the hydrogen sulfide, converting it to  sulfate  ions , which are then made available to plants for amino acid formation.  The carbon cycle.  Most of the organic matter present in soil originates in plant material from dead  leaves, rotting trees, decaying roots, and other plant tissues. Animal tissues enter the soil after  death. In the  carbon cycle , soil bacteria and fungi recycle the  carbon  of proteins, fats, and  carbohydrates by using the organic plant and animal matter in their metabolism. Without the 
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