Biogeochemical cycles

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Photosynthesis

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23 Terms

1

Photosynthesis

CO2 from atmo. to plants

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2

Burial

Carbon in plants or ocean becomes oil, coal, or methane

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3

Exchange

CO2 from atmo. dissolves in ocean water

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4

Respiration / decomposition (carbon)

CO2 released from living organisms as they process food

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5

Combustion (carbon)

Fossil fuels are burned releasing CO2

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6

Abiotic fixation

Atmo. N2 → NO3 (nitrate) from lightning or fertilizer production

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7

Biotic fixation

Atmo. N2 → NH4 from bacteria in legumes (ex. clover, beans)

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8

Ammonification / decomposition (nitrogen)

Dead matter → NH4 from decomposers

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9

Nitrification

NH4 (ammo.)→ NO3 (nitrate) and NO2 from soil bacteria

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10

Assimilation

NH4 (ammo.), NO3 (nitrate), NO2 (nitrite) in soil absorbed into plants

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11

Denitrification

NO3 (nitrate) and NO2 (nitrite)→ atmo. N2 from soil bacteria

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12

Leaching (nitrogen)

NH4 (ammo.), NO3 (nitrate), NO2 (nitrite) removed from sol by water

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13

Precipitation

Water falls as snow or rain

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14

Runoff

Water moves across soil towards a body of water

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15

Infiltration

Water moves through the ground into an aquifer

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16

Condensation

Water vapor loses heat and becomes liquid

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17

Transpiration

Water evaporates from plant leaves

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18

Evaporation

Liquid water becomes water vapor in the atmo.

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19

Weathering

Rock is broken down by wind and water, releasing PO4 (phosphorus)

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20

Decomposition (phosphorus)

PO4 (phosphorus) released from dead/decaying organic matter

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21

Leaching (phosphorus)

PO4 (phosphorus) is carried away when water infiltrates through soil

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22

Combustion (sulfur)

SO4 (sulfate) released in volcanic eruptions, burning fossil fuels or wood

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23

Acid percipitation

Sulfuric acid in atmo. mixes with rain or snow

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