lect6...2 - Biogeochemical Cycles - accessible reservoir,...

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Biogeochemical Cycles - accessible reservoir, inaccessible reservoir, biota - Carbon cycle - Nitrogen cycle - Phosphorus cycle -Summary
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Earth represents a closed system for elements and nutrients. Biogeochemical cycles have biotic and abiotic components. Inaccessible reservoir Accessible reservoir Living organisms General Form: -a ±s ink - exchange with the cycle is slower than by the active components - active component - active component Large reservoirs: atmosphere, oceans and sediments N, C, O, H, S Gaseous cycles: (1) global in nature; (2) turnover quickly sedimentary rock P, Ca, K, Mg, Fe
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Fig. 54.17; p. 1196-1197 cycling time: ~ 3-5 years 2% of C cycled/year Dissolved CO 2 in oceans: DIC & calcium carbonate -CO 2 ~200X more soluble than O 2 in water -~300-400 yrs - ~50X the [atmosphere] - buffers atmospheric processes Deep sea deposition: 5 orders of magnitude > atmosphere: long-term storage - protects carbon from oxidation - only 0.03% of the atmosphere - 750 Gt -reciprocal processes - 600-720 Gt
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lect6...2 - Biogeochemical Cycles - accessible reservoir,...

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