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Nutrient Cycle <ul><li>Nutrient – a substance (element or compound) that promotes growth and health in living things </li>...
E.g. Carbon Cycle
Nutrient Cycle BIOMASS SOIL LITTER Uptake Pathway Gain from weathering Loss by leaching Loss by runoff Gain from precipita...
Biomass BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from weather...
Soil BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from precipitat...
Litter BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from weatheri...
Uptake Pathway:  Absorption and take-up of elements from soil by plant roots BIOMASS SOIL LITTER Uptake Pathway Loss by le...
Fallout Pathway: Death of plants and animals and the addition of nutrients to the litter store BIOMASS SOIL LITTER Uptake ...
Decay Pathway: Decomposition of litter to humus and return of nutrients to soil BIOMASS SOIL LITTER Uptake Pathway Loss by...
Gain from Weathering: Chemical elements added to soil by weathering of rocks BIOMASS SOIL LITTER Uptake Pathway Loss by le...
Gain from Precipitation: Additional nutrients from precipitation, lightning or wind-blown dust etc. BIOMASS SOIL LITTER Up...
Loss by Runoff and Leaching: N utrient removal through the erosive movement and chemical action of water.  BIOMASS SOIL LI...
Positive Human Impacts <ul><li>Organic fertilizers </li></ul><ul><li>Inorganic fertilizers </li></ul><ul><li>Planting tree...
Negative Human Impacts <ul><li>Deforestation </li></ul><ul><li>Unsustainable farming practices </li></ul><ul><li>Using cro...
Nutrient Cycles – Biomes Compared
Temperate deciduous forest <ul><li>balance between stores </li></ul><ul><li>moderate transfers between stores </li></ul>
Boreal forest (taiga) <ul><li>litter is main store (needles) </li></ul><ul><li>little transfer between stores </li></ul>
Tropical rain forest <ul><li>biomass is main store </li></ul><ul><li>rapid transfer between stores and environment </li></ul>
 
      Nutrient Cycling models for BIOMES (Gersmehl)
Questions to consider… <ul><li>Biomass- What types and sizes of plants are there? How many layers? </li></ul><ul><li>Litte...
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Ecosystems 3 Nutrient Cycle

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Ecosystems 3 Nutrient Cycle

  1. 1. Nutrient Cycle <ul><li>Nutrient – a substance (element or compound) that promotes growth and health in living things </li></ul><ul><li>Plants and animals absorb nutrients from gas or soluble salts </li></ul><ul><li>Oxygen, carbon, hydrogen and nitrogen are needed in large quantities – these are known as macronutrients </li></ul><ul><li>Trace elements such as magnesium, sulphur and phosphorous are called micronutrients </li></ul>
  2. 2. E.g. Carbon Cycle
  3. 3. Nutrient Cycle BIOMASS SOIL LITTER Uptake Pathway Gain from weathering Loss by leaching Loss by runoff Gain from precipitation Decay Pathway Fallout Pathway
  4. 4. Biomass BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from weathering Gain from precipitation
  5. 5. Soil BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from precipitation
  6. 6. Litter BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from weathering Gain from precipitation
  7. 7. Uptake Pathway: Absorption and take-up of elements from soil by plant roots BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Gain from precipitation Decay Pathway Fallout Pathway
  8. 8. Fallout Pathway: Death of plants and animals and the addition of nutrients to the litter store BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Gain from precipitation Decay Pathway Fallout Pathway Gain from weathering
  9. 9. Decay Pathway: Decomposition of litter to humus and return of nutrients to soil BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Gain from precipitation Decay Pathway Fallout Pathway Gain from weathering
  10. 10. Gain from Weathering: Chemical elements added to soil by weathering of rocks BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Gain from precipitation Decay Pathway Fallout Pathway Gain from weathering
  11. 11. Gain from Precipitation: Additional nutrients from precipitation, lightning or wind-blown dust etc. BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from precipitation Gain from weathering
  12. 12. Loss by Runoff and Leaching: N utrient removal through the erosive movement and chemical action of water. BIOMASS SOIL LITTER Uptake Pathway Loss by leaching Loss by runoff Decay Pathway Fallout Pathway Gain from precipitation Gain from weathering
  13. 13. Positive Human Impacts <ul><li>Organic fertilizers </li></ul><ul><li>Inorganic fertilizers </li></ul><ul><li>Planting trees and other plants </li></ul>
  14. 14. Negative Human Impacts <ul><li>Deforestation </li></ul><ul><li>Unsustainable farming practices </li></ul><ul><li>Using crop stalks and manure for fuel </li></ul><ul><li>Irrigation </li></ul><ul><li>Harvesting </li></ul>
  15. 15. Nutrient Cycles – Biomes Compared
  16. 16. Temperate deciduous forest <ul><li>balance between stores </li></ul><ul><li>moderate transfers between stores </li></ul>
  17. 17. Boreal forest (taiga) <ul><li>litter is main store (needles) </li></ul><ul><li>little transfer between stores </li></ul>
  18. 18. Tropical rain forest <ul><li>biomass is main store </li></ul><ul><li>rapid transfer between stores and environment </li></ul>
  19. 20.     Nutrient Cycling models for BIOMES (Gersmehl)
  20. 21. Questions to consider… <ul><li>Biomass- What types and sizes of plants are there? How many layers? </li></ul><ul><li>Litter- How quickly will it decompose? What kind of litter will fall? </li></ul><ul><li>Soil- How quickly will the litter decompose? What is the climate like? How much precipitation is there? </li></ul>

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