Microbial Ecology and Soil Microbes

About Microbial ecology and Soil Microbes

• Microbial ecology is the branch of science that studies the relationships between microorganisms and their biotic and abiotic environment.
• It applies general ecological principles to understand the activities and functions of microorganisms in their natural environments.
• Research methods:
  • In situ: Microorganisms are studied directly in their natural habitats.
  • Ex situ / in vitro: Laboratory experiments are useful for understanding microbial processes under controlled or artificial conditions.
  • Microbial ecology uses laboratory experiments, mathematical modelling, field studies and observation of natural microbial communities
• Importance and application: Microbial ecology is important in biotechnology because it helps in the development of environmental biotechnologies.
  • It helps scientists understand and use beneficial microorganisms such as nitrogen-fixing bacteria, plant hormone-producing bacteria, pollutant-degrading microorganisms, and bacteria that control soil pathogens.
  • It is also useful for cleaning polluted soil and water, treating wastewater, controlling pests, and removing environmental pollutants.

About Soil Microbes

• Soil microbes are very small organisms, usually measured in micrometres, and they can only be seen clearly with powerful microscopes.
• Examples: The major groups of soil microorganisms include bacteria, fungi, and viruses.
• Characteristics:
  • These microorganisms live together in communities called soil microbiomes.
  • It functions like small communities in which microorganisms interact with one another and with their environment.
  • Even a single grain of sand can contain thousands of bacterial cells.
  • It interact by sharing nutrients and genetic material with one another. They also compete for space and nutrients in the soil.
  • Some bacteria produce antibiotics to inhibit or kill competing microorganisms. Eg. Soil bacteria such as Streptomyces are important sources of antibiotic compounds used in medicine.
• Soil microorganisms play an important role in the carbon cycle.
  • Some microbes help store carbon in the soil, while others decompose plant and animal remains and release carbon back into the environment.
  • They are therefore important for decomposition and nutrient cycling in soil.
• Condition impacting:
  • The activities of soil microbes are strongly affected by environmental conditions, including temperature. Rising temperatures caused by global warming can increase microbial activity in some soils.
• Impact:
  • Increased microbial activity can cause more stored carbon to be released into the atmosphere as carbon dioxide.
  • Higher levels of atmospheric carbon dioxide can contribute to further increases in global temperature.