Soil as Habitat for Microbes - chemical properties

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chemical properties of soil, microbes in soil, nitrogen cycle, why microbes are in soil, facts of microbes in soil, numbers of microbes in soil, action of nutrient cycles in soil

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Soil as Habitat for Microbes - chemical properties

  1. 1. b.stev Soil as Habitat for Microbes chemical properties
  2. 2. CHEMICALS in the soil aid their growth MICROBES USE SPECIFIC CHEMICALS <ul><li>many require, carbon, in order to survive </li></ul><ul><li>others survive utilising certain compounds </li></ul>WHY ARE MICROBES IN SOIL? “ aerobes ” : need O2 “ anaerobes ”: don’t need oxygen
  3. 3. NUMBERS OF MICROBES IN SOIL a small teaspoon of soil contains approx Algae 1000 - 1 million Fungi 100,000 – 1 million Bacteria 100 million – 1 billion ONLY: through microbial action do organic fertilizers become useful to plants (Texas A and M University, 2008)
  4. 4. A microbial process is ESSENTIAL to how a nutrient cycles through the soil CHEMICAL is absorbed for use a PRODUCT excreted in another form FOR A PLANT: it is whether a chemical is absorbed if a microbe had not processed the chemical, the plant would be deficient of its product ALSO regulates the quantities available to plants
  5. 5. THE same principal applies to these subjects: ANIMALS - what it is that the animal ingests as nutrient DECAYING MATTER - replenishing organic material EXCRETIONS – breakdown animal waste WEATHER FLUCUATIONS - work to maintain equilibrium (Texas A and M University, 2008)
  6. 6. years of RESEARCH has been performed on nutrient cycles & how this occurs the MAIN CYCLES are : nitrogen/ carbon/ sulphur/ water/ phosphorus <ul><li>the next picture : shows the cycle of nitrogen </li></ul><ul><li>observe what occurs in the soil </li></ul><ul><li>this is all because of microbial action </li></ul>
  7. 8. there is a COMPLEXITY of chemical reactions occuring this is the habitat that microbes utilise & maintain as part of the “, Nitrogen Cycle,” within soil (Pidwirny. M. Dr, 2008)
  8. 9. EXACTLY what do MICROBES do IN THE SOIL? “ Lets take the - Nitrogen cycle , & look at it closely” NITROGEN is extracted from the air & placed into the soil from microbial action <ul><li>the plants absorb the product </li></ul><ul><li>it is even given back as nitrogen gas to the air </li></ul>
  9. 10. nitrogen gas in the air is altered to ammonia in the soil N 2 + 3H + + 3e - = NH 3 NH 3 + H + = NH 4 + THEN ammonia is altered to ammonium ion 2NH 4 + + 3O 2 = 4H + + 2H 2 O + 2NO 2 - THEN ammonium ion becomes nitrite ion O.K: lets look closely – first,
  10. 11. 2NO 3 - + 12H + + 11e - = N 2 + 6H 2 O ALSO: nitrogen gas is made from nitrate & is then emitted into the air 2NO 2 - + O 2 = 2NO 3 - nitrite ion is THEN altered to nitrate each EQUATION is performed by a different microbe PLANTS use the nitrate as a nutrient (Wikipedia, 2008)
  11. 12. These reactions all occur simultaneously The HABITAT has an equilibrium between the different chemicals & it is the microbes that work to maintain this
  12. 13. Bibliography Wikipedia. (2008). Nitrogen cycle- wikipedia,the free encylopedia . Retrieved September 20, 2008, from http//:www.en.wikipedia.org/ wiki/ Nitrogen _ cycle - 45k - Pidwirny. M. Dr. (2008). 9(s). The nitrogen cycle . Retrieved September 20, 2008, from http//:www.physicalgeography.net/fundamentals /9s.html - 15k Trakhtenberg. I. (2001). Activities . Retrieved September 20, 2008, from http//:www. soil .gsfc.nasa.gov/activ_98/microact.htm - 16k - Texas A and M University. (2008). Welcome to soil and crop sciences at Texas A and M University. Retrieved September 20, 2008, from http//: www.organiclifestyles.tamu.edu/ soil / microbe index.html - 32k -

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