phosphorus lecture

phosphorus lecture - Ecosystems (5) Nitrogen (end) The...

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Ecosystems Lecture 5 1 Ecosystems (5) Nitrogen (end) The Phosphorus Cycle There is only the moon, embalmed in phosphorus. “The Detective” Sylvia Plath Nitrogen Cycle Review Air Land & Water Land & Water Air Within Land & Water AIR WATER SOIL AIR WATER SOIL AIR WATER SOIL Organic N -C-C-NH 2 NH 4 + mineralization Substrate C:N vs. Microbial C:N Low C:N NH 4 + release to soil microbes High C:N immobilization
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Ecosystems Lecture 5 2 NITRIFICATION: Nitrosomonas: Nitrobacter: ammonium + O 2 nitrite ORGANIC N mineralization nitrification SOIL NH 4 + NO 3 - immobilization NH 4 + + O 2 NO 2 - + 2H + + H 2 O OVERALL: Ammonium nitrite nitrate Nitrite + O 2 nitrate NO 2 - + O 2 NO 3 - IMMOBILIZATION: microbes retain nitrogen for their own use (creating more microbes) INTERNAL CYCLE OF N PLANT uptake litterfall Plants Soil ORGANIC N mineralization SOIL NO 3 - surface water Leaching to groundwater nitrification NH 4 + immobilization AIR WATER PLANTS SOIL Thoreau’s Bog Walden, Mass. “I derive more of my subsistence from the swamps which surround my native town than from the cultivated gardens in the village.” “Walking”
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Ecosystems Lecture 5 3 NITROGEN CYCLE: Thoreau’s Bog (units in g/m2/yr) Atmosphere N Fixation = 1.0 Deposition = 0.75 Denitrification = 0.3 Hemond 1983 Ecology 64:99 Plants Soil Water water flow = 0.3 Nitrification = 0 Mineralization = 2.6 Immobilization = 1.0 (peat storage) Uptake = 3.8 Litterfall = 3.8 Great Sippewissett Marsh, Massachusetts http://www.photolib.noaa.gov/coastline/images/line0899.jpg NITROGEN CYCLE: Sippewissett Salt Marsh (units in g/m2/yr) Atmosphere N Fixation = 6.8 Deposition = 0.8 (Bird feces = 0.02) Denitrification = 14.3 Hemond 1983 Ecology 64:99 Plants Soil Water Nitrification = 0 Mineralization = 15.5 Immobilization = 0 Tide input = 54.1 Tide output = 64.3 Upland groundwater = 12.6
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Ecosystems Lecture 5 4 Fertilizer 91 Feed 65 Fossil fuel 33 Deposition 30 N fixation 23 INPUTS 10 9 g N year -1 ) Denitrification 90 Atmosphere 68 River output 51 Landfill waste 9 Product export 7 OUTPUTS 10 9
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This note was uploaded on 08/18/2011 for the course ECOLOGY 351 taught by Professor Staff during the Spring '11 term at Rutgers.

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phosphorus lecture - Ecosystems (5) Nitrogen (end) The...

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