11 - NUTRIENT CYCLES READINGS FREEMAN 2005 Chapter 54 Pages...

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NUTRIENT CYCLES READINGS: FREEMAN, 2005 Chapter 54 Pages 1252-1259
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NUTRIENT CYCLES: ECOSYSTEM TO ECOSPHERE Nutrient cycling occurs at the local level through the action of the biota. Nutrient cycling occurs at the global level through geological processes, such as, atmospheric circulation, erosion and weathering.
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NUTRIENT CYCLES The atoms of earth and life are the same; they just find themselves in different places at different times. Most of the calcium in your bones came from cows, who got it from corn, which took it from rocks that were once formed in the sea. The path atoms take from the living (biotic) to the non-living (abiotic) world and back again is called a biogeochemical cycle .
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Nutrients: The Elements of Life Of the 50 to 70 atoms (elements) that are found in living things, only 15 or so account for the major portion of living biomass. Only around half of these 15 have been studied extensively as they travel through ecosystems or circulate on a global scale. Na SODIUM Mn MANGANESE Fe IRON Cl CHLORINE P PHOSPHORUS Al ALUMINUM S SULFUR Mg MAGNESIUM Si SILICON K POTASSIUM Ca CALCIUM N NITROGEN H HYDROGEN C CARBON O OXYGEN
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A GENERALIZED MODEL OF NUTRIENT CYCLING IN AN ECOSYSTEM The cycling of nutrients in an ecosystem are interlinked by an a number of processes that move atoms from and through organisms and to and from the atmosphere, soil and/or rocks, and water. Nutrients can flow between these compartments along a variety of pathways.
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Nutrient Compartments in a Terrestrial Ecosystem The organic compartment consists of the living organisms and their detritus. The available-nutrient compartment consists of nutrients held to surface of soil particles or in solution. The third compartment consists of nutrients held in soils or rocks that are unavailable to living organisms. The fourth compartment is the air which can be found in the atmosphere or in the ground.
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Uptake of Inorganic Nutrients from the Soil With the exception of CO 2 and O 2 which enter though leaves, the main path of all other nutrients is from the soil through the roots of producers. Even consumers which find Ca, P, S and other elements in the water they drink, obtain the majority of these nutrients either directly or indirectly from producers.
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The Atmosphere Is a Source of Inorganic Nutrients The atmosphere acts as a reservoir for carbon dioxide (CO 2 ), oxygen (O 2 ) and water (H 2 O).
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