Biogeochemical Cycles

1
Biogeochemical Cycles

• Water
• Carbon
• Nitrogen

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Water Cycle
3
Carbon Cycle
4
Nitrogen Cycle
5
PROCESS WHAT IS NEEDED (Reactants) WHAT IS PRODUCED (Products) WHAT DOES THE WORK?
NITROGEN FIXATION Nitrogen Gas (N2) Usable nitrogen Nitrates (NO3-)and Ammonia (NH3) made in roots of legumes and in the soil. Nitrogen fixing bacteria in soil and in Legume roots.
AMMONIFICATION Death and waste Decomposing bacteria Ammonia Decomposers (Bacteria and Fungus)
NITRIFICATION Ammonia Nitrifying bacteria Nitrates Nitrifying Bacteria
ASSIMILATION Nitrates (some plants can use Ammonia) Any nitrogen based compound needed by plants and animals. Nitrogen is used to make amino acids (proteins). Chemical reactions in the organism
DENITRIFICATION Excess nitrates Denitrifying bacteria Nitrogen Gas Denitrifying Bacteria