MATTER CYCLES between biotic abiotic reservoirs water cycle

MATTER CYCLES between biotic, abiotic reservoirs

water cycle

• Evaporation from bodies of water • Condensation into clouds, fog • Precipitation What about the biotic? • Water, H, & O atoms needed by, stored in, and moved through organisms as part of the water cycle ex: used in photosynthesis, produced in respiration, transpired in great quantities by plants

carbon cycle

• Vast stores of C in atmosphere, oceans as CO 2 • Taken up by plants in photosynthesis • Stored as organic molecules (ex: fructose - C 6 H 12 O 6) in tissues of organisms

• Organic molecules used by organisms in respiration • C released as CO 2 into atmosphere, oceans

• Also taken up by aquatic animals for shell building (Ca. CO 3)

nitrogen cycle

• N 2 is abundant in atmosphere a form not usable by most organisms • Solution? Converted first by bacteria in roots of legumes (peas, beans, nuts) nitrogen-fixation • Further converted to NOx by soil bacteria ammonification, nitrification • Taken up by plants, used to build proteins, DNA • Still other bacteria return N 2 to the atmosphere denitrification

phosphorous cycle http: //io. uwinnipeg. ca/~simmons/Chap 5498/img 025. jpg

phosphorous cycle • Largest reservoir is on land in rocks, soil minerals and ocean sediment no atmospheric source • As rock weathers, phosphate slowly released to soil low availability limits plant growth needed to build proteins, DNA • Erodes with soil into rivers, lakes and oceans, settles to floor