IB Biology HL 1-2 Carbon Cycling PDF

C4.2 Carbon Cycling C4.2.17 - 2.22 IB Biology HL 1-2 C 4.2.17 Constructing Carbon Cycle Diagrams Pool: reserve of storage Atmosphere n place for certain elements...

C4.2 Carbon Cycling C4.2.17 - 2.22 IB Biology HL 1-2 C 4.2.17 Constructing Carbon Cycle Diagrams Pool: reserve of storage Atmosphere n place for certain elements tio n Ce io ira st ph llu p (use boxes) u ot lar es b os om res rr C yn pir la th a llu es tio Flux: transfer of an element n Ce is from one pool to another (use eating/ingestion arrows) Consumers Producers deat h th dea Dead matter fossi lizati Fossil Fuels on C 4.2.18 Ecosystems as carbon sinks and carbon sources Ecosystems are open (can gain/lose matter and energy) Main fluxes are caused by photosynthesis and respiration Sink: net uptake in carbon photosynthesis respiration Source: net release of carbon photosynthesis respiration Can be influenced by decomposition rates, biosequestration, fires, etc. C 4.2.19 Release of carbon dioxide into the atmosphere during combustion of biomass, peat, coal, oil and natural gas. Atmosphere Fossilization creates carbon sink in the n io n tio Ce st ira ph llu bu form of peat, coal, and natural gas lar sp ot m re re os sp Co yn lar ira th tio llu es n Ce Burning these (combustion) releases is carbon eating/ingestion Consumers Producers In order for the atmospheric carbon death dea th dioxide levels to remain constant, uptake Dead matter in sinks needs to be equal to release foss from sources ilizat ion Fossil Fuels Release is currently outpacing uptake. C 4.2.20 Analysis of the Keeling Curve in terms of photosynthesis, respiration and combustion Overall trend - up due to human activity CO2, Annual trend - up and Photosynthesis down due to Summer photosynthesis rates Combustion of fossil fuels! C 4.2.21 Dependence of aerobic respiration on atmospheric oxygen produced by photosynthesis and oh photosynthesis on atmospheric carbon dioxide produced by respiration Autotrophs and heterotrophs depend on each other for metabolic substrates Huge amounts measured/estimated in gigatons (1015 grams) C 4.2.22 Recycling of all chemical elements required by living organisms in ecosystems Energy flows, nutrients cycle C H O N P + small amounts of other elements Obtain through absorption or consumption Quantities are limited so they must be recycled by decomposers and returned to the soil/environment for reuptake