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Soil Biology (Microbiology (Growth/activity affected by... (Temperature,…

- - - - matter composition (C)
      - Breakdown to CO2
      - CO2 for plants
    - - N-based compounds (amino acids)
      - mineralized by microbes
        
        NH4+ (ammonium)
        
        NO3- (nitrate)
      - fixated N by microbes
      - plants incorporate into living
      - many factors
  - - - bio activity/breakdown rate
      - diffusion rate
  - - - intracellular
      - extracellular enzymes
  - - - roots stimulate bacteria/fungi growth
      - heterotrophic activity
    - - pathogens
      - fungi, nematodes
      - bacteria
    - - intimate association
      - 2 different organisms
      - mutually beneficial
      - nitrogen-fixing bacteria
      - mycorrhizae
  - - - develop soil
      - decompose
      - cycle nutrients
      - break down contaminants
      - protozoa & algae
        
        single celled
        
        small
        
        photosynthesis (algae)
        
        nutrients from bacteria (protozoa)
      - nematodes
        
        unsegmented roundworms
        
        15,000+ species
        
        found in large #s
        
        may damage roots
      - fungi
        
        heterotrophic
        
        classified on structure
        
        variety of environments
        
        destruct cellulose, etc
      - bacteria
        
        diverse
        
        phototrophic or chemotrophic
        
        aerobic or anaerobic
        
        decomposition
        
        nutrient cycling
        
        cyanobacteria
        
        in arid areas
        
        part of soil crusts
      - viruses
        
        smallest
        
        most numerous
        
        important
- - - - Producers
        
        autotrophs
        
        plants
      - consumers
        
        heterotrophs
        
        plant-eaters
      - decomposers
        
        fungi
  - - - plants
      - animals
    - - prokaryotic
        
        bacteria
        
        lack distinct nucleus
      - eukaryotic
        
        fungi
        
        protozoa
        
        algae
        
        larger organisms
        
        nucleus w/ DNA
  - - - H2O
      - organisms
      - dust
    - - light
      - organics
      - inorganics
    - - aerobic (O2)
      - anaerobic (w/o O2)
      - facultative (both)
- - - - cell division
      - in meristem
    - - conductive tissue
      - in root
    - - sugar delivery
    - - H20 transport
      - dissolved nutrient transport
    - - where microbial pop.
      - influenced by roots