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    N-15 in symbiotic fungi and plants estimates nitrogen and carbon flux rates in Arctic tundra

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    i0012-9658-087-04-0816.pdf (123.2Kb)
    Date
    2006-04
    Author
    Hobbie, John E.  Concept link
    Hobbie, Erik A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/911
    As published
    https://doi.org/10.1890/0012-9658(2006)87[816:NISFAP]2.0.CO;2
    DOI
    10.1890/0012-9658(2006)87[816:NISFAP]2.0.CO;2
    Keyword
     Alaska; Arctic tundra; Carbon flux; Mycorrhizae; N-15; Nitrogen-limited ecosystems; Plant nitrogen; Soil nitrogen; Plant–fungal symbioses; Soil–microbe–root relationships 
    Abstract
    When soil nitrogen is in short supply, most terrestrial plants form symbioses with fungi (mycorrhizae): hyphae take up soil nitrogen, transport it into plant roots, and receive plant sugars in return. In ecosystems, the transfers within the pathway fractionate nitrogen isotopes so that the natural abundance of N-15 in fungi differs from that in their host plants by as much as 12‰. Here we present a new method to quantify carbon and nitrogen fluxes in the symbiosis based on the fractionation against N-15 during transfer of nitrogen from fungi to plant roots. We tested this method, which is based on the mass balance of N-15, with data from arctic Alaska where the nitrogen cycle is well studied. Mycorrhizal fungi provided 61–86% of the nitrogen in plants; plants provided 8–17% of their photosynthetic carbon to the fungi for growth and respiration. This method of analysis avoids the disturbance of the soil–microbe–root relationship caused by collecting samples, mixing the soil, or changing substrate concentrations. This analytical technique also can be applied to other nitrogen-limited ecosystems, such as many temperate and boreal forests, to quantify the importance for terrestrial carbon and nitrogen cycling of nutrient transfers mediated by mycorrhizae at the plant–soil interface.
    Description
    Author Posting. © Ecological Society of America, 2006. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecology 87 (2006): 816-822.
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    • Ecosystems Center
    Suggested Citation
    Ecology 87 (2006): 816–822
     

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