Ch. 21 Notes.docx - Ch 21 Nutrient Cycles in Nature...

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Ch. 21 – Nutrient Cycles in Nature Biogeochemical cycling o The movement & conversion of materials by biochemical activities within the ecosphere. o Elements circulate in characteristic paths or cycles between biotic & abiotic portions of the ecosystem. o Energy flow through an ecosystem Absorbed -> converted -> stored -> dissipated o The essential elements are most regularly cycled. o Nonessential & toxic elements are also cycled. o Size of the reservoir of these elements can cause some issues. Small, actively cycled reservoirs are more likely disrupted. o Nitrogen can be recycled, but some parts of the Nitrogen cycle can cause problems & set changes in the environment. Physical Chemical Dissolution Biosynthesis Precipitation Biodegradation Volatilization Oxido-reductive biotransformation Fixation Nitrogen Cycle o Nitrogen is needed by all organisms to synthesize proteins and nucleic acids. o Plants, animals, & most microbes require combined forms of nitrogen for incorporation into cellular biomass.
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