Communities physical processes interconnect to form ecosystems - PowerPoint PPT Presentation

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Communities physical processes interconnect to form ecosystems

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Primary productivity = amount of C fixed in an ecosystem by: CO2 ... cycles = Nutrients cycle btwn biotic & abiotic forms ... Biotic factors increase nutrient ... – PowerPoint PPT presentation

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Title: Communities physical processes interconnect to form ecosystems


1
  • Communities physical processes interconnect to
    form ecosystems
  • Ecosystems are connected by
  • 1. energy flow between trophic levels energy
    also released as heat energy into environment
  • Autotrophs 10 producers
  • Primary productivity amount of C fixed in an
    ecosystem by CO2 H20 light --gt (C6H1206)
    O2
  • Heterotrophs
  • Consumers herbivores, omnivores, carnivores
  • Decomposers
  • 2. Nutrient and water cycling (Biogeochemical
    cycling)
  • 1. water, 2. carbon, 3. nitrogen, 4.
    phosphorus
  • Humans have impacts on ecosystems

2
Energy flow (also refer to Fig. 20.3 20.7)
  • Only 10 transfers between levels.
  • Loss due to Metabolism and waste

3
  • BioGeoChemical cycles Nutrients cycle btwn
    biotic abiotic forms
  • Definitions of Reservoirs and fluxes,
    mineralization, fixation/assimilation
  • Flux rate dependent on ?
  • Major Biogeochemical cycles Atmospheric cycles
    carbon and nitrogen Sedimentary phosphorus
    Hydrologic

9
4
Carbon
  • Reservoirs ?
  • Transformations?

5
Nitrogen - why is N impt?- what is symbiotic N
fixation?- cause and results of excess N?
Nitrogen fixation
Rhizobium
Denitrification
Anaerobic bacteria
Industrial inputs Fertilizer, atmospheric
deposition
6
Phosphorus
Pools? Transformations? Cause and consequences
of excess P in aquatic systems
7
  • PO4- is difficult to acquire
  • 80 of plants have mycorrhizal symbionts to help
    (fungi) other benefits (H20) offset cost

8
  • Biotic factors increase nutrient retention how?
  • Excessive disturbance decreases retention why?

9
Human Impact 1
  • Reduced biodiversity, habitat loss, habitat
    fragmentation

10
Human Impact 2
  • Pollution air, water, land
  • Reduction in ozone layer

11
Human Impact 3 - Excess N P
12
Human Impact 4 - Accelerated release of CO2
13
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