Biotic soil-plant interaction processes explain most of hysteric soil CO₂ efflux response to temperature in cross-factorial mesocosm experiment.

ABSTRACT: Ecosystem carbon flux partitioning is strongly influenced by poorly constrained soil CO₂ efflux (F_soil). Simple model applications (Arrhenius and Q₁₀) do not account for observed diel hysteresis between F_soil 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 F_soil-T hysteresis. We hypothesized a principally biological cause for the hysteresis. Alternatively, F_soil hysteresis is primarily driven by thermal convection through the soil profile. We conducted experiments under normal, fluctuating diurnal soil temperatures and under

SUBMITTER: Dusza Y 

PROVIDER: S-EPMC6976568 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature