VonSperberWeilerBrueggemann2015

Référence

von Sperber, C., Weiler, M., Brüggemann, N. (2015) The effect of soil moisture, soil particle size, litter layer and carbonic anhydrase on the oxygen isotopic composition of soil-released CO2. European Journal of Soil Science, 66(3):566-576. (Scopus )

Résumé

Soil respiration and photosynthesis are the two largest carbon dioxide (CO2) fluxes between terrestrial ecosystems and the atmosphere and, therefore, the dominant processes influencing the oxygen isotopic composition of atmospheric CO2. The characterization of temporal and spatial variations of plant and soil-related fluxes of different oxygen isotopologues of CO2 (12C16O2; 12C16O18O) is relevant to constraining the global carbon budget. The oxygen isotopic composition of soil-respired CO2 is controlled by its release rate, the degree of isotopic equilibrium with soil water and the diffusional transport of CO2. The hypothesis of this study was that, as well as soil moisture, the soil particle size, the presence of an organic litter layer and the enzyme carbonic anhydrase (CA) would have a significant impact on the oxygen isotopic composition of soil-released CO2. We tested this hypothesis with soil microcosm experiments on columns of medium and fine sand. Soil water content and soil texture influenced the isotopic composition of soil-released CO2 significantly. A litter layer had a significant effect on the isotopic composition of water vapour but not on CO2 released from soil. In the absence of CA, oxygen isotope equilibration between the CO2 invasion flux and soil water was insignificant, whereas in the presence of CA about 55% of the CO2 invading the soil exchanged oxygen isotopes with soil water. Our findings highlight the importance of small-scale variability of soil attributes for the oxygen isotopic composition of soil-released CO2 as well as the strong impact of CA activity in soils. © 2015 British Society of Soil Science.

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@ARTICLE { VonSperberWeilerBrueggemann2015,
    AUTHOR = { von Sperber, C. and Weiler, M. and Brüggemann, N. },
    TITLE = { The effect of soil moisture, soil particle size, litter layer and carbonic anhydrase on the oxygen isotopic composition of soil-released CO2 },
    JOURNAL = { European Journal of Soil Science },
    YEAR = { 2015 },
    VOLUME = { 66 },
    NUMBER = { 3 },
    PAGES = { 566-576 },
    NOTE = { cited By 3 },
    ABSTRACT = { Soil respiration and photosynthesis are the two largest carbon dioxide (CO2) fluxes between terrestrial ecosystems and the atmosphere and, therefore, the dominant processes influencing the oxygen isotopic composition of atmospheric CO2. The characterization of temporal and spatial variations of plant and soil-related fluxes of different oxygen isotopologues of CO2 (12C16O2; 12C16O18O) is relevant to constraining the global carbon budget. The oxygen isotopic composition of soil-respired CO2 is controlled by its release rate, the degree of isotopic equilibrium with soil water and the diffusional transport of CO2. The hypothesis of this study was that, as well as soil moisture, the soil particle size, the presence of an organic litter layer and the enzyme carbonic anhydrase (CA) would have a significant impact on the oxygen isotopic composition of soil-released CO2. We tested this hypothesis with soil microcosm experiments on columns of medium and fine sand. Soil water content and soil texture influenced the isotopic composition of soil-released CO2 significantly. A litter layer had a significant effect on the isotopic composition of water vapour but not on CO2 released from soil. In the absence of CA, oxygen isotope equilibration between the CO2 invasion flux and soil water was insignificant, whereas in the presence of CA about 55% of the CO2 invading the soil exchanged oxygen isotopes with soil water. Our findings highlight the importance of small-scale variability of soil attributes for the oxygen isotopic composition of soil-released CO2 as well as the strong impact of CA activity in soils. © 2015 British Society of Soil Science. },
    AFFILIATION = { Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology, Kreuzeckbahnstr. 19, Garmisch-Partenkirchen, 82467, Germany; Institute of Earth and Environmental Sciences, University Freiburg, Fahnenbergplatz, Freiburg, 79098, Germany; Department of Biology, Group of Biogeochemistry, Stanford University, 473 Via Ortega, Y2E2 Building, Stanford, CA 94305-5020, United States; Forschungszentrum Jülich, Institute of Bio- and Geosciences, Agrosphere (IBG-3), Leo-Brandt-Str., Jülich, 52425, Germany },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/ejss.12241 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929663466&doi=10.1111%2fejss.12241&partnerID=40&md5=ab397475765f1918977ecbea16a5dd36 },
}

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