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SECTION 13.5 : Biogeochemical Cycles

SECTION 13.5 : Biogeochemical Cycles. Hydrologic cycle (water cycle) Carbon cycle Nitrogen cycle Phosphorus Cycle In an ecosystem, material is constantly cycled among organisms and the environment. Most food & oxygen is produced by primary producers through photosynthesis

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SECTION 13.5 : Biogeochemical Cycles

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  1. SECTION 13.5 : Biogeochemical Cycles • Hydrologic cycle (water cycle) • Carbon cycle • Nitrogen cycle • Phosphorus Cycle In an ecosystem, material is constantly cycled among organisms and the environment. Most food & oxygen is produced by primary producers through photosynthesis Energy is not cycled in the biosphere

  2. precipitation condensation transpiration evaporation surface runoff lake water storage in ocean groundwater seepage 1. Hydrologic cycle Vocabulary: • Precipitation -- Groundwater • Condensation -- Evaporation • Transpiration -- Aquifers

  3. carbon dioxide in air respiration combustion photosynthesis respiration photosynthesis decomposition of organisms carbon dioxide dissolved in water fossil fuels 2. Carbon cycle • Vocabulary: • Photosynthesis -- Cell. Respiration • Combustion -- Decomposition • Fossil Fuels

  4. nitrogen in atmosphere animals plant nitrates nitrogen-fixing bacteria in roots decomposers nitrifying bacteria ammonification nitrites nitrogen-fixing bacteria in soil ammonium nitrifying bacteria denitrifying bacteria 3. Nitrogen cycle • Nitrogen fixation: • Nitrogen fixing bacteria convert nitrogen gas (N) into ammonia (NH3) • These bacteria on theroots of plantsor inthe soil. • Legumes are a • special kind of • vegetable plant • -decomposers • are important • to this process

  5. nitrogen in atmosphere animals plant nitrates nitrogen-fixing bacteria in roots decomposers nitrifying bacteria ammonification nitrites nitrogen-fixing bacteria in soil ammonium nitrifying bacteria denitrifying bacteria • Nitrogen is taken in by plants/animals to make protein & nucleotides. • (Ammonification) • Nitrogen returnsto the soil duringdecomposition.

  6. rain geologic uplifting weathering of phosphate from rocks runoff plants animals phosphate in soil phosphate in solution leaching sedimentation forms new rocks decomposers 4. Phosphorus cycle • Phosphate is released by the weathering of rocks. • P moves into plants (producers) and then into consumers. • P returns to the soil during decomposition. • P flows from the soil into groundwater andis trapped in rocks.

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