Increased CO 2 fluxes from a sandy Cambisol under agricultural use in the Wendland region, Northern Germany, three years after biochar substrates application
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...
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| Published in: | Global change biology. Bioenergy Vol. 10; no. 7; pp. 432 - 443 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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01-07-2018
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| 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. |
|---|---|
| AbstractList | 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. |
| Author | Polifka, Steven Glaser, Bruno Wiedner, Katja |
| Author_xml | – sequence: 1 givenname: Steven orcidid: 0000-0002-1793-3590 surname: Polifka fullname: Polifka, Steven organization: Soil Biogeochemistry Institute of Agronomy and Nutritional Sciences Martin Luther University Halle‐Wittenberg Halle (Saale) Germany – sequence: 2 givenname: Katja orcidid: 0000-0003-1090-7813 surname: Wiedner fullname: Wiedner, Katja organization: Soil Biogeochemistry Institute of Agronomy and Nutritional Sciences Martin Luther University Halle‐Wittenberg Halle (Saale) Germany – sequence: 3 givenname: Bruno orcidid: 0000-0002-3057-3868 surname: Glaser fullname: Glaser, Bruno organization: Soil Biogeochemistry Institute of Agronomy and Nutritional Sciences Martin Luther University Halle‐Wittenberg Halle (Saale) Germany |
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| Title | Increased CO 2 fluxes from a sandy Cambisol under agricultural use in the Wendland region, Northern Germany, three years after biochar substrates application |
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