Carbon, Nitrogen, and Phosphorous Cycles

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Last updated 12:36 AM on 7/26/26
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57 Terms

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Atmosphere

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Photosynthesis

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Plant Respiration

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Plant biomass

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Net terrestrial uptake

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Soil carbon

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Soil

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Microbial respiration and decomposition

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Atmospheric Carbon Net Annual Increase

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Gigatons of carbon/year

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Fossil fuels, cement, and land use change

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Air sea gas exchange

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Surface ocean

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Phytoplankton and photosynthesis

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Respiration and decomposition

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Net ocean uptake

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deep ocean

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Reactive Sediments

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Fossil pool

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Inorganic N (Mostly N2)

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Industrial Fixation

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Atmospheric fixation on land

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Bioloical fixation on land

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Plants and animals

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Atmospheric fixation on waters

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N2

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Dissolved N (Aquatic biological fixation)

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N2O

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NO2-

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Denitrfying bacteria

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Dead organic matter

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Urea (NH3)

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NO2-

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Nitrogen-fixing bacteria

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Nitrifying bacteria

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Inorganic N (mostly N3)

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Sediments

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Crust

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Plants and animals

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Organic decomposition

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Phosphate rock

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Sewage

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erosion

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Erosion

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Dissolved phosphates

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Water based biological cycle

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Excretion and decay

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animals and plants

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Detergents

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Soil phosphates

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Phosphate mine

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Fertilizer

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Land based biological cycle

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Crops

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Excretion and decay

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Inorganic Cycle

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Geological uplift