frst201 midterm soil organism & forest productivity

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Author:
nanajun
ID:
240942
Filename:
frst201 midterm soil organism & forest productivity
Updated:
2013-10-16 01:22:59
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frst
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soil organism
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  1. why soil organisms are important
    • • Recycle nutrients
    • • Produce and consume gases that affect global climate,
    • • Destroy pollutants
    • • Treat wastes
    • • Used for biocontrol of plant and animal pests
    • • Soil microorganisms - major sources of pharmaceuticals, antibiotics, immunosuppressants, enzymes and anti-tumour agents
  2. classes of soil organisms
    • Soil Fauna
    • Macro fauna (cm’s long):Movers & ShakersResponsible for soil mixing. Large enough to disrupt soil structure.
    • Meso fauna (200 µm - 1cm):Fragment debris and promote soil structure
    • Micro fauna (<200 µm):Confined to water films -regulate soil microbes

    • Soil Microorganisms (0.3-10 µm)
    • Bacteria
    • Archaea
    • Fungi
    • Algae, viruses, lichen
  3. Symbiotic bacteria
    • - Non-leguminous nodules
    • - Symbiotic fungi
  4. Factors determining forest productivity
    • 1. GPP is the product of leaf area index and photosynthetic efficiency
    • 2. Photosynthetic efficiency is generally controlled by genetics
    • 3. LAI and photosynthetic rate are limited by (1) Light, (2) Temperature, (3) [CO2], (4) water, (5) nutrients
    • 4. Photosynthetic rates become saturated at high resource levels
    • 5. Canopy exceeds leaf photosynthetic capacity due to crown architecture (ecosystems responses)
    • 6. NPP is usually limited by multiple resources
    • 7. Plants adjust physiology and allocation patterns to increase the supply of limiting resources
    • 8. GPP of trees is the foundation of the productivity, structure and function of forest ecosystems (NEP)
  5. GPP =
    total amount of C fixed by plants through photosynthesis
  6. NPP =
    Net C gain by vegetation = plant biomass
  7. Rplant = Rgrowth+Rmaintenance+Rion
    R= respiration

    Maintenance respiration may account for half total plant respiration, other half is growth and ion uptake

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