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Methane Oxidation in Slurry Storage Surface Crusts

^a Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark
^b Institute of Agricultural, Environmental and Energy Engineering, University of Agricultural Sciences, A-1180 Vienna, Austria
^c GSF-Research Center for Environment and Health GmbH, Institute of Soil Ecology, D-85764 Neuherberg, Germany

View larger version (62K): [in a new window]   Fig. 1. A schematic drawing of the natural crust floating on the surface of storages with untreated cattle slurry (left) and the loose straw layer added to storages with digested cattle slurry (right). The depth intervals sampled for characterization and incubation experiments are indicated.

View larger version (26K): [in a new window]   Fig. 2. Methane (top) and O2 concentrations (bottom) during incubation of extracts of natural surface crust material from storages with untreated slurry (UCS), and of straw used as an artificial surface crust on storages with digested slurry (DCS). The subscript terms C and 0 indicate presence or absence, respectively, of an additional solid cover. The data represent mean ± standard error (n = 3).

View larger version (28K): [in a new window]   Fig. 3. Methane fluxes during incubation of surface crust material from storages with untreated cattle slurry (UCS) or anaerobically digested cattle slurry (DCS). The subscript terms C and 0 indicate presence or absence, respectively, of an additional solid cover. After an initial rate determination, the material was partially dried, and later rewetted, both times with determination of CH4 fluxes (see text). The data represent mean ± standard error (n = 3). OM, organic matter.