TY - JOUR
T1 - Biotic soil-plant interaction processes explain most of hysteric soil CO2 efflux response to temperature in cross-factorial mesocosm experiment
AU - Dusza, Yann
AU - Sanchez-Cañete, Enrique P.
AU - Galliard, Jean François Le
AU - Ferrière, Régis
AU - Chollet, Simon
AU - Massol, Florent
AU - Hansart, Amandine
AU - Juarez, Sabrina
AU - Dontsova, Katerina
AU - Haren, Joost van
AU - Troch, Peter
AU - Pavao-Zuckerman, Mitchell A.
AU - Hamerlynck, Erik
AU - Barron-Gafford, Greg A.
N1 - Funding Information:
The experiment, data acquisition, and collaborations were supported by funding to R. Ferrière under the program “Investissements d’Avenir” launched by the French government and implemented by ANR with the reference ANR-10-IDEX-0001-02 PSL (EXPECTS project), under the CNRS Eco-Evo-Devo Pépinière program and under the Partner University Funds program 2013 between ENS and University of Arizona (UofA). Additional funding in United States was provided by the Philecology Foundation (Fort Worth, Texas, USA) and its founder, Mr. Edward Bass, and the Thomas R. Brown Family Foundation. This work has benefited from technical and human resources provided by the CNRS IR ECOTRONS and CEREEP-Ecotron IleDeFrance (CNRS/ENS UMS 3194) as well as financial support from the Regional Council of Ile-de-France under the DIM Program R2DS bearing the references I-05-098/R and 2011-11017735 and from the European Union FEDER program 2007–2013. It has received a support under the program “Investissements d’Avenir” launched by the French government and implemented by ANR with the reference ANR-11-INBS-0001 AnaEE France. This project and data were also supported by NSF awards 1417101 and 1331408 to G. Barron-Gafford, as well as by a Marie Curie International Outgoing Fellowship within the Seventh European Community Framework Programme, DIESEL project (625988) to E.P. Sanchez-Cañete. Additional awards provided travel support to G. Barron-Gafford from the UofA Office of Global Initiatives, the Office of the Vice President of Research at the UofA, and the UMI iGLOBES program at the UofA. The authors thank Ken Coppola at the Desert Legume Program (DELEP) in Tucson, Arizona, who provided seeds for the experiment from the field site.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - Ecosystem carbon flux partitioning is strongly influenced by poorly constrained soil CO2 efflux (Fsoil). Simple model applications (Arrhenius and Q10) do not account for observed diel hysteresis between Fsoil and soil temperature. How this hysteresis emerges and how it will respond to variation in vegetation or soil moisture remains unknown. We used an ecosystem-level experimental system to independently control potential abiotic and biotic drivers of the Fsoil-T hysteresis. We hypothesized a principally biological cause for the hysteresis. Alternatively, Fsoil hysteresis is primarily driven by thermal convection through the soil profile. We conducted experiments under normal, fluctuating diurnal soil temperatures and under conditions where we held soil temperature near constant. We found (i) significant and nearly equal amplitudes of hysteresis regardless of soil temperature regime, and (ii) the amplitude of hysteresis was most closely tied to baseline rates of Fsoil, which were mostly driven by photosynthetic rates. Together, these findings suggest a more biologically-driven mechanism associated with photosynthate transport in yielding the observed patterns of soil CO2 efflux being out of sync with soil temperature. These findings should be considered on future partitioning models of ecosystem respiration.
AB - Ecosystem carbon flux partitioning is strongly influenced by poorly constrained soil CO2 efflux (Fsoil). Simple model applications (Arrhenius and Q10) do not account for observed diel hysteresis between Fsoil and soil temperature. How this hysteresis emerges and how it will respond to variation in vegetation or soil moisture remains unknown. We used an ecosystem-level experimental system to independently control potential abiotic and biotic drivers of the Fsoil-T hysteresis. We hypothesized a principally biological cause for the hysteresis. Alternatively, Fsoil hysteresis is primarily driven by thermal convection through the soil profile. We conducted experiments under normal, fluctuating diurnal soil temperatures and under conditions where we held soil temperature near constant. We found (i) significant and nearly equal amplitudes of hysteresis regardless of soil temperature regime, and (ii) the amplitude of hysteresis was most closely tied to baseline rates of Fsoil, which were mostly driven by photosynthetic rates. Together, these findings suggest a more biologically-driven mechanism associated with photosynthate transport in yielding the observed patterns of soil CO2 efflux being out of sync with soil temperature. These findings should be considered on future partitioning models of ecosystem respiration.
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U2 - 10.1038/s41598-019-55390-6
DO - 10.1038/s41598-019-55390-6
M3 - Article
C2 - 31969580
AN - SCOPUS:85078129634
SN - 2045-2322
VL - 10
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 905
ER -