1 / 24

Biogeochemical Cycles

Biogeochemical Cycles. Biology, Geology and Chemistry Cycle Nutrients through the Ecosystem. I. General Information. A. Biogeochemical cycles = materials cycle between the living and physical parts of an ecosystem B. Types of cycles 1. Water 2. Carbon 3. Nitrogen.

jeanettejones
Télécharger la présentation

Biogeochemical Cycles

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Biogeochemical Cycles Biology, Geology and Chemistry Cycle Nutrients through the Ecosystem

  2. I. General Information • A. Biogeochemical cycles = materials cycle between the living and physical parts of an ecosystem B. Types of cycles 1. Water 2. Carbon 3. Nitrogen

  3. II. Water Cycle

  4. II. Water Cycle • Driven by the Sun B. Steps of Water Cycle 1. Evaporation – a. Sun heats Earth b. H2O evaporates c. H2O goes into atmosphere as H2O vapor

  5. II. Water Cycle 2. Condensation H2O condenses (goes from gas to liquid) to form clouds

  6. II. Water Cycle 3. Precipitation H2O leaves clouds, falls on Earth E.g. rain, snow, sleet, hail 4. Percolation /Infiltration H2O enters soil, becomes groundwater

  7. II. Water Cycle 5. Run–off Some H2O moves on surface to rivers, lakes & oceans 6. Transpiration H2O released from plant leaves, returns to atmosphere

  8. II. Water Cycle C. Where is the H2O on Earth? 1. Oceans 97.2% 2. Glaciers 2.15% 3. Lakes 0.009% 4. Soil 0.005% 5. Atmosphere 0.001% 6. Streams 0.0001%

  9. II. Water Cycle

  10. III. Carbon Cycle

  11. III. Carbon Cycle • How does carbon enter the living part of the cycle? 1. Photosynthesis Plants, algae, & cyanobacteria use CO2 to make organic compounds (sugars) 2. Nutrients move C through trophic levels Consumers move organic compounds

  12. III. Carbon Cycle B. How does carbon get back into the physical part of the cycle? 1. Respiration O2 used to break down sugars, CO2 released

  13. III. Carbon Cycle 2. Combustion • Fossil fuels & wood burned CO (carbon monoxide) released to atmosphere • Factory & Auto emissions release CO to atmosphere

  14. III. Carbon Cycle 3. Erosion • CaCO2 from shells returned to system as sediment • Shelled organisms die • Sediment returns C to ecosystem by erosion (wind & water)

  15. III. Carbon Cycle 5. Decomposition of waste and dead materials • Some dead organisms become fossil fuels • Some dead organisms and waste decay, returning nutrients to the soil

  16. III. Carbon Cycle

  17. IV. Nitrogen Cycle

  18. IV. Nitrogen Cycle • General information 1. N needed to make proteins Proteins = large molecules that perform almost all of living organisms’ vital f(x)s (functions)

  19. IV. Nitrogen Cycle 2. N hard to convert into a form usable by plants 3. Most steps of N cycle occur in the soil 4. Bacteria very important to the N cycle

  20. IV. Nitrogen Cycle B. Steps of the N cycle 1. Nitrogen fixation Bacteria work with legumes (peas, beans, peanuts) to take N2 from atmosphere, put it into the soil

  21. IV. Nitrogen Cycle 2.Ammonification • Animals & plants deposit nitrogenous waste • Decomposers • (bacteria & fungi) convert organic N (proteins) to ammonia (NH3)

  22. IV. Nitrogen Cycle 3. Nitrification Another kind of bacteria convert ammonia (NH3) → to ammonium to nitrites (NO2-) & nitrates (NO3-) NH3 → NH4+ → NO2- + NO3-

  23. IV. Nitrogen Cycle 4. Denitrification Another kind of bacteria convert nitrites and nitrates to nitrogen gas NO2- + NO3- →N2

  24. IV. Nitrogen Cycle

More Related