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Title: Environmental Microbiology 3: Microbes as a Component of Terrestrial Environments
Description: These notes cover the microbes present in terrestrial environments as well as the factors that effect the soils and the microbes that inhabit them. These notes were taken from class lectures of a year three course.
Description: These notes cover the microbes present in terrestrial environments as well as the factors that effect the soils and the microbes that inhabit them. These notes were taken from class lectures of a year three course.
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Unit 2 Part 2 - Microbes as a
Component of Terrestrial Environments
Terrestrial Environments
Among all the microbial environments, terrestrial environments are one of the richest
and most complex
Soil constitutes the major habitat of terrestrial microorganisms and is very favorable for
growth and activities of microbes
All soils contain rich diversity of active microorganisms
Various Zones of Soil
1
...
Unsaturated or Vadose Zone
3
...
002
Silt
0
...
02
Fine Sand
0
...
20
Course sand
0
...
0
Stones & Gravel
Above 2
...
Live biomass including animals, microbes, and plant roots
2
...
Humic substances (heterogeneous matter formed by decaying and degradation
of plants, animals and microbial masses)
Organic matter
...
Organic matter
2
...
chlorides, and organic salts of Ca, Mg, Na, K
More Terminology
Eutrophic: Soil with more or less with optimum concentration of various nutrients salts
Oligotrophic: soil with sub-optimal concentration of nutrient salts
Soil acidity: associated with H-ions on exchange complex
- Expressed in pH
Effect of pH on Microbial Activity
Soil pH strongly affects the microbial activities
Below ph 5
...
root-rot of cotton, potato scab
Other soil-borne diseases are controlled by increasing pH
ex
Title: Environmental Microbiology 3: Microbes as a Component of Terrestrial Environments
Description: These notes cover the microbes present in terrestrial environments as well as the factors that effect the soils and the microbes that inhabit them. These notes were taken from class lectures of a year three course.
Description: These notes cover the microbes present in terrestrial environments as well as the factors that effect the soils and the microbes that inhabit them. These notes were taken from class lectures of a year three course.