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3-3 Cycles of matter

3-3 Cycles of matter. Recycling in the Biosphere. Unlike the one-way flow of energy, MATTER is recycled within and between ecosystems Biogeochemical cycles connect biology geology & chemistry. P/S: what does ‘biogeochemical’ mean?. Water cycle. Water is essential to all life

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3-3 Cycles of matter

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  1. 3-3 Cycles of matter

  2. Recycling in the Biosphere • Unlike the one-way flow of energy, MATTER is recycled within and between ecosystems • Biogeochemical cycles connect biology geology & chemistry P/S: what does ‘biogeochemical’ mean?

  3. Water cycle • Water is essential to all life • Fresh water from the oceans moves into the atmosphere by • Evaporation condensation • Transpiration (leaves) precipitation

  4. Nutrient cycles • Chemicals needed by living things to build tissues, carry out essential life functions circulate through the ecosystem Whiteboard: List the elements found in the diagram above

  5. Carbon cycle • Carbon is essential to life • CO2 moves from the air into plants • CO2 returns to the air with respiration, decomposition, and burning fuels

  6. Nitrogen Cycle N2 in Atmosphere Synthetic fertilizer manufacture Synthetic fertilizer manufacturer Atmospheric nitrogen fixation Decomposition Uptake by producers Reuse by consumers Uptake by producers Reuse by consumers Decomposition excretion Decomposition excretion Bacterial nitrogen fixation NO3 and NO2 NH3

  7. Nitrogen cycle • N in the air is changed by soil bacteria into ammonia • Taken up by roots • Animals eat their N when they eat plants • Decay, feces return N back to the soil P/S: how are the C and N cycle similar? Different?

  8. PhosphorusCycle • P is needed for DNA & RNA • It is rare in the biosphere • Most P is stored in rocks and ocean sediments • Organisms • Land • Ocean • Sediments

  9. Limiting nutrients • If a nutrient is scarce, it will limit growth in an ecosystem • Fertilizers add N, P, & K to crops to promote growth • TOO MUCH of a nutrient can alsoupset the balance: fertilizer runoff forms algal blooms in rivers and lakes Pygmy forest, Mendocino, CA

  10. Whiteboard: what caused the algal blooms you see here? Clear Lake, CA

  11. Human impact Human activity (burning fossil fuels, deforestation) has greatly impacted natural nutrient cycles, causing air, water, and soil pollution.

  12. Summary Today’s lecture was on nutrient _____________ I learned about ___________________________ I knew already that ______________________ I wonder about________________________________

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