UIUC NRES 201 - Biotic Cycling of Nitrogen and Sulfur I (3 pages)

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Biotic Cycling of Nitrogen and Sulfur I



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Biotic Cycling of Nitrogen and Sulfur I

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Lecture number:
33
Pages:
3
Type:
Lecture Note
School:
University of Illinois at Urbana, Champaign
Course:
Nres 201 - Introductory Soils
Edition:
1
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Unformatted text preview:

NRES 201 Lecture 33 Outline of Last Lecture I Plant Roots II Algae III Fungi IV Bacteria and other soil microbes V Factors affecting microbial growth Outline of Current Lecture VI Nitrogen in plants VII Natural occurrence of nitrogen VIII Nitrogen in soils IX The nitrogen cycle a Biological Fixation b Atmospheric Deposition c Mineralization d Immobilization Current Lecture Functions of nitrogen in plants Protein constituent structural and enzymes o required for all metabolic processes Inheritance constituent of DNA and RNA Energy storage and transfer constituent of ATP and related compounds Photosynthesis constituent of chlorophyll Natural Occurrence of Nitrogen N occurs in all four spheres of the earth 1 Lithosphere 98 is in here a Due to fixed NH4 being in igneous rocks 2 Atmosphere a rest is in atmosphere b air is 78 N2 by volume c the ultimate source of N for living systems 3 Hydrosphere 4 Biosphere The Nitrogen Cycle 1 N addition These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 2 3 4 5 6 7 Mineralization Nitrification Plant Uptake NO3 leaching Denitrification Volatilization Biological Nitrogen Fixation Overall Reaction N2 NH4 Organic N High Energy Requirement A triple bond N N must be broken Two forms o Symbiotic N2 fixation by legumes and a few non legumes Association with Rhizobium Fixation occurs in root nodules Amount of N fixed varies widely Fixation is reduced by Soil Acidity Plant Stress NO3 Availability Legumes take up soil N Non legumes Lower fixation than with nodulated legumes o Non symbiotic N2 fixation By free living bacteria Major organisms Photoautotroph and Heterotrophs Significance Very limited because of the need for Light Organic C and Fertilizer Sales Atmospheric Nitrogen Deposition Forms of Deposition As NH4 or NO3 in particulates dry deposition or in rain snowfall wet deposition Sources of Deposition Manure Combustion of Fossil Fuel



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