Nutrient%20Cycles - PowerPoint PPT Presentation

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Nutrient%20Cycles

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Title: Nutrient Cycles Author: Anne F. Maben Last modified by: Fort Smith Public Schools Created Date: 10/21/1998 12:53:50 AM Document presentation format – PowerPoint PPT presentation

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Title: Nutrient%20Cycles


1
The Physical Earth
The Santa Paula Creek Watershed in Southern
California
2
Gaia Hypothesis
  • Proposed by James Lovelock and Lynn Margulis
  • Planet Earth is comparable to individual
    organisms
  • Has Homeostasis
  • Responds to a changing environment

3
Sphere Definitions
  • Biosphere
  • Atmosphere
  • Troposphere
  • Stratosphere
  • Hydrosphere
  • Lithosphere

4
Biogeochemical Cycles
5
Biogeochemical cycles
  • Influence the availability of nutrients to
    ecosystem
  • Elements available as ions.
  • Nutrient reserves are maintained by inputs
    and recycling

6
Biogeochemical cycles
  • Amount of nutrients recycled gt amount entering or
    leaving.
  • Environment Inputs
  • precipitation, metabolism, and weathering.
  • Environmental Outputs
  • runoff and evaporation.

7
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8
Water Cycle
  • Living systems gt 50 water
  • Need water for aquatic animals to live in

9
The Water Cycle
10
Carbon Cycle
  • Needed for ALL organic molecules

What are organic molecules and why are they so
important?
11
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12
Nitrogen Cycle
  • Needed for proteins and nucleic acids
  • Cannot be taken in directly by animals needs to
    be assimilated by plants first

13
Nitrogen Cycle
14
Nitrogen Cycle
  • Nitrogen fixation
  • Nitrification
  • Assimilation
  • Ammonification
  • Denitrification

15
Phosphorus Cycle
  • Needed for nucleotides
  • Needed for phospholipids of cell membranes
  • Cannot be taken in directly by animals needs to
    be assimilated by plants first

16
(No Transcript)
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