The synergetic effect of moisture protection, substrate quality and biotic acclimation on soil organic carbon persistence along a cultivated loamy hillslope

Wiaux, François;Vanclooster, Marnik;Cornélis, Jean-Thomas;Van Oost, Kristof
(2014) EGU General Assembly — Location: Vienna, Austria (28.April.2014)

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The combination of hydrologic, geomorphic and biogeochemical approaches is required to determine organic carbon (OC) persistence and dynamics within landscapes. Here, we used soil in-situ surface heterotrophic respiration measurement as an indicator of OC persistence along a hillslope (crop field on the loess belt Under temperate climate), characterized by an important erosion-induced OC stock colluvium downslope. Along this topographical gradient, we quantified the space-time structure of soil water and temperature, and soil OC amount and quality (from a chemical point of view based on NaOCl oxidation) in relation to CO2 fluxes. We used a Generalized Least Square (GLS) regression model to identify the role of each abiotic factor as well as their interactions on observed soil respiration rates, and to calculate time-average values of these CO2 fluxes at each studied slope positions.
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Wiaux, F., Vanclooster, M., Cornélis, J.-T., & Van Oost, K. (2014). The synergetic effect of moisture protection, substrate quality and biotic acclimation on soil organic carbon persistence along a cultivated loamy hillslope. Geophysical Research Abstracts, vol.16, p. EGU2014-13456. https://hdl.handle.net/2078.5/231604