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    Soil microbial activity and N availability with elevated CO2 in Mojave Desert soils

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    2003GB002137.pdf (723.1Kb)
    Issue Date
    2004
    Author
    Billings, Sharon A.
    Schaeffer, Sean M.
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    This published article is © American Geophysical Union and can found on the publisher's website at http://dx.doi.org/10.1029/2003GB002137
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    Abstract
    We examined the effects of elevated CO2 on soil nitrogen (N) dynamics in the Mojave Desert by measuring plant N isotope composition (δ15N), soil microbial biomass N, soil respiration, resin-available N, and C and N dynamics during soil incubations. With elevated CO2, foliage of Larrea tridentata and Krameria erecta had mean δ15N 2.1 and 1.1‰ higher with elevated CO2, respectively, and elevated CO2 increased microbial biomass N in dry soils under a perennial grass (6.8 ± 1.4 versus 3.7 ± 0.3 μg/g). Elevated CO2 significantly increased cumulative resin-available N in the field by 12%, driven by available soil moisture. Rates of soil respiration with elevated CO2 were sporadically higher under Pleuraphis and Larrea. Soils under shrubs had greater potential net N mineralization (102.6 ± 24.2 μg/g) than soils under grasses and in plant interspaces (40.0 ± 9.69 μg/g). Rates of recalcitrant N turnover in soil incubations were related to soil substrate availability. Results indicate that shifts in soil microbial structure and/or activity may occur with elevated CO2 and may result in increases in plant-available N when soil moisture is available.
    URI
    http://hdl.handle.net/1808/9150
    DOI
    https://doi.org/10.1029/2003GB002137
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    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Billings, S. A., S. M. Schaeffer, and R. D. Evans (2004), Soil microbial activity and N availability with elevated CO2 in Mojave Desert soils, Global Biogeochem. Cycles, 18, GB1011, http://dx.doi.org/10.1029/2003GB002137

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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