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• W2800261291 abstract "Abstract In recent years, biochar has been discussed as an opportunity for carbon sequestration in arable soils. Field experiments under realistic conditions investigating the CO 2 emission from soil after biochar combined with fertilizer additions are scarce. Therefore, we investigated the CO 2 emission and its 13 C signature after addition of compost, biogas digestate (originating from C4 feedstock) and mineral fertilizer with and without biochar (0, 3, 10, 40 Mg biochar/ha) to a sandy Cambisol in Northern Germany. Biomass residues were pyrolized at ~650°C to obtain biochar with C3 signature. Gas samples were taken biweekly during the growing season using static chambers three years after biochar substrate addition. The CO 2 concentration and its δ 13 C isotope signature were measured using a gas chromatograph coupled to an isotope ratio mass spectrometer. Results showed increased CO 2 emission (30%–60%) when high biochar amount (40 Mg/ha) was applied three years ago together with mineral fertilizer and biogas digestate. On average, 59% of the emitted CO 2 had a C3 signature (thus, deriving from biochar and/or soil organic matter), independent of the amount of biochar added. In addition, our results clearly demonstrated that only a small amount of released CO 2 derived from biochar. The results of this field experiment suggest that biochar most likely stimulates microbial activity in soil leading to increased CO 2 emissions derived from soil organic matter and fertilizers mineralization rather than from biochar. Nevertheless, compared to the amount of carbon added by biochar, additional CO 2 emission is marginal corroborating the C sequestration potential of biochar." @default.
• W2800261291 created "2018-05-17" @default.
• W2800261291 creator A5027366737 @default.
• W2800261291 creator A5054156048 @default.
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• W2800261291 date "2018-05-04" @default.
• W2800261291 modified "2023-09-26" @default.
• W2800261291 title "Increased CO₂ fluxes from a sandy Cambisol under agricultural use in the Wendland region, Northern Germany, three years after biochar substrates application" @default.
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• W2800261291 doi "https://doi.org/10.1111/gcbb.12517" @default.
• W2800261291 hasPublicationYear "2018" @default.
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