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    Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems

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    soilsystems-03-00006.pdf
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    Author
    Roby, Matthew C.
    Scott, Russell L.
    Barron-Gafford, Greg A.
    Hamerlynck, Erik P.
    Moore, David J. P.
    Affiliation
    Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA
    Univ Arizona, Sch Geog & Dev, Tucson, AZ 85721 USA
    Univ Arizona, Coll Sci, Biosphere 2, Tucson, AZ 85721 USA
    Issue Date
    2019-01-08
    Keywords
    soil respiration
    drylands
    water availability
    spatial variation
    temporal dynamics
    pulses
    photosynthesis
    ecosystem respiration
    
    Metadata
    Show full item record
    Publisher
    MDPI
    Citation
    Roby, M.C.; Scott, R.L.; Barron-Gafford, G.A.; Hamerlynck, E.P.; Moore, D.J.P. Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems. Soil Syst. 2019, 3, 6.
    Journal
    SOIL SYSTEMS
    Rights
    Copyright © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Soil CO2 efflux (F-soil) is a major component of the ecosystem carbon balance. Globally expansive semiarid ecosystems have been shown to influence the trend and interannual variability of the terrestrial carbon sink. Modeling F-soil in water-limited ecosystems remains relatively difficult due to high spatial and temporal variability associated with dynamics in moisture availability and biological activity. Measurements of the processes underlying variability in F-soil can help evaluate F-soil models for water-limited ecosystems. Here we combine automated soil chamber and flux tower data with models to investigate how soil temperature (T-s), soil moisture (theta), and gross ecosystem photosynthesis (GEP) control F-soil in semiarid ecosystems with similar climates and different vegetation types. Across grassland, shrubland, and savanna sites, theta regulated the relationship between F-soil and T-s, and GEP influenced F-soil magnitude. Thus, the combination of T-s, theta, and GEP controlled rates and patterns of F-soil. In a root exclusion experiment at the grassland, we found that growing season autotrophic respiration accounted for 45% of F-soil. Our modeling results indicate that a combination of T-s, theta, and GEP terms is required to model spatial and temporal dynamics in F-soil, particularly in deeper-rooted shrublands and savannas where coupling between GEP and shallow theta is weaker than in grasslands. Together, these results highlight that including theta and GEP in F-soil models can help reduce uncertainty in semiarid ecosystem carbon dynamics.
    Note
    Open access journal
    ISSN
    2571-8789
    DOI
    10.3390/soilsystems3010006
    Version
    Final published version
    Sponsors
    USDA-ARSUnited States Department of Agriculture (USDA); U.S. Department of Energy Berkeley National Labs
    ae974a485f413a2113503eed53cd6c53
    10.3390/soilsystems3010006
    Scopus Count
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    UA Faculty Publications

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