Biogeochemical Cycles

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Cycles of Matter Organisms are mainly composed of C, H, O & N

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Presentation transcript:

Biogeochemical Cycles EQ: What are the biogeochemical cycles of nutrients and how are they alike?

Biogeochemical Cycles in Nature There is only a limited amount of resources (water, nitrogen, carbon) on the Earth. In order to keep these resources available to organisms, they must be recycled after they are used. Matter is neither created nor destroyed…it just changes forms. Biogeochemical Cycles: pathway by which an element or molecule moves through both biotic and abiotic parts of the Earth Carbon Water Nitrogen

Carbon Cycle Major component of macromolecules (lipids, proteins, nucleic acids, carbohydrates) Found in: atmosphere (CO2), minerals and rocks, fossil fuels, and in organic materials of soil/sediment

Carbon Cycle Organisms play a role in recycling carbon through natural, chemical processes…what process?? PHOTOSYNTHESIS!

Water (Hydrologic) Cycle Water is necessary for life processes of all living organisms Found in: atmosphere, surface, underground, in living organisms Driven by energy from the sun.

Water (Hydrologic) Cycle Organisms play a role in recycling water through natural, chemical processes…during what processes? Precipitation Condensation Transpiration Evaporation Runoff

Nitrogen Cycle Nitrogen is component of amino acids - build proteins. Found in: atmosphere (N2), living organisms (proteins & nucleic acids), soil/sediment Key Steps: 1. Nitrogen fixation: Bacteria in the roots of plants (called legumes) change Nitrogen from the atmosphere (N2) to different Nitrogen compounds (NO3) 2. Plants absorb the Nitrogen 3. Animals eat the plants - take in Nitrogen 4. Decay/Decomposition – Organisms die or leave behind wastes (bacteria digest the Nitrogen) 5. Denitrification: Bacteria change the NO3 back to N2 and release it to the atmosphere

Nitrogen Cycle Organisms play a role in recycling nitrogen through natural, chemical processes… Nitrogen fixation and denitrification