Ch 10 ppt

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Ch 10 ppt

  1. 1. Chapter 10Chapter 10 EcologicalEcological RestorationRestorationEcological SuccessionEcological Succession Natural recovery (to state prior to humanNatural recovery (to state prior to human disturbance) is possible if damage is notdisturbance) is possible if damage is not too greattoo great Must have a good understanding ofMust have a good understanding of natural succession to facilitate recoverynatural succession to facilitate recovery
  2. 2.  Two kinds ofTwo kinds of succession:succession:  Primary successionPrimary succession:: establishment of anestablishment of an ecosystem where thereecosystem where there was none beforewas none before Retreating glaciers Sand dune succession Volcano
  3. 3.  Secondary successionSecondary succession: reestablishment of an: reestablishment of an ecosystem following disturbanceecosystem following disturbance On an abandoned clearing or after a fire
  4. 4. Patterns of Species ChangePatterns of Species Change During SuccessionDuring Succession  FacilitationFacilitation::  InterferenceInterference::  Life History DifferencesLife History Differences::  Chronic PatchinessChronic Patchiness::
  5. 5. Chemical CyclingChemical Cycling  Organic matter:Organic matter:  Organic matter is soil’s best friend!
  6. 6.  Soils store more chemical elements thanSoils store more chemical elements than living things, but cycle much more slowlyliving things, but cycle much more slowly  In mature ecosystems more elementsIn mature ecosystems more elements are stored in the trees/flora and soils mayare stored in the trees/flora and soils may be very poor.be very poor.
  7. 7. Sand is larger Holds less nutrients Clay particles are very small and hold more nutrients Importance of surface area
  8. 8.  Disturbances, such as fire, returnDisturbances, such as fire, return elements to soil (highly water soluble) forelements to soil (highly water soluble) for rapid re-growthrapid re-growth  Uprooted trees, from storms:Uprooted trees, from storms:
  9. 9. Restoration is…Restoration is…  More difficult on lands that have…More difficult on lands that have…  Lost organic matter due to leaching,Lost organic matter due to leaching, overuse…overuse…  been subjected to:been subjected to:
  10. 10. What’s the ultimateWhat’s the ultimate fate?fate?  Climax state:Climax state:  Does it last forever with no disturbance?Does it last forever with no disturbance?  OROR  Gradual loss of nutrients in soil, slowGradual loss of nutrients in soil, slow biological deteriorationbiological deterioration
  11. 11. Possible Answer:Possible Answer:  Seems to be a balance betweenSeems to be a balance between  AndAnd  Addition of nutrientsAddition of nutrients into ecosystem as livinginto ecosystem as living things grow and die and decaythings grow and die and decay  The climax state appears not to existThe climax state appears not to exist indefinitelyindefinitely  Deterioration appears to occurDeterioration appears to occur

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