Relationship between greenhouse gas emissions and changes in soil gas diffusivity in a field experiment with biochar and lime
Abstract Reducing greenhouse gas emissions from arable soil while maintaining productivity is a major challenge for agriculture. Biochar is known to reduce N2 O emissions from soil, but the underlying mechanisms are unclear. This study examined the impact of green waste biochar (20 Mg ha−1) and lime (CaCO3; 2 Mg ha−1) application on soil gas transport properties and related changes in these to soil N2 O and CO2 emissions measured using automated chambers in a field experiment cropped with maize. In situ soil water content monitoring was combined with laboratory measurements of relative soil gas diffusion coefficient ( D p/ D0) at different matric potentials, to determine changes in D p/ D0 over time. Cumulative N2 O emissions were similar in the control and lime treatment, but much lower in the biochar treatment. Cumulative CO2 emissions decreased in the order: lime treatment > biochar treatment > control soil. When N2 O emissions were not driven by excess N supply shortly after fertilisation, they were associated with D p/ D0 changes, whereby decreases in D p/ D0 corresponded to N2 O emissions peaks. No distinct pattern was observed between CO2 emissions and D p/ D0. Cumulative N2 O emissions were positively related to number of days with D p/ D0< 0.02, a critical limit for soil aeration. These results indicate that improved soil gas diffusivity, and hence improved soil aeration, may explain the effect of biochar in reducing N2 O emissions. They also suggest that knowledge of D p/ D0 changes may be key to explaining N2 O emissions..
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:182 |
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| Enthalten in: |
Journal of Plant Nutrition and Soil Science - 182(2019), 4, Seite 667-675 |
| Beteiligte Personen: |
Keller, Thomas [VerfasserIn] |
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| BKL: |
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| Anmerkungen: |
© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
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| Umfang: |
9 |
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| doi: |
10.1002/jpln.201800538 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a Abstract Reducing greenhouse gas emissions from arable soil while maintaining productivity is a major challenge for agriculture. Biochar is known to reduce N2 O emissions from soil, but the underlying mechanisms are unclear. This study examined the impact of green waste biochar (20 Mg ha−1) and lime (CaCO3; 2 Mg ha−1) application on soil gas transport properties and related changes in these to soil N2 O and CO2 emissions measured using automated chambers in a field experiment cropped with maize. In situ soil water content monitoring was combined with laboratory measurements of relative soil gas diffusion coefficient ( D p/ D0) at different matric potentials, to determine changes in D p/ D0 over time. Cumulative N2 O emissions were similar in the control and lime treatment, but much lower in the biochar treatment. Cumulative CO2 emissions decreased in the order: lime treatment > biochar treatment > control soil. When N2 O emissions were not driven by excess N supply shortly after fertilisation, they were associated with D p/ D0 changes, whereby decreases in D p/ D0 corresponded to N2 O emissions peaks. No distinct pattern was observed between CO2 emissions and D p/ D0. Cumulative N2 O emissions were positively related to number of days with D p/ D0< 0.02, a critical limit for soil aeration. These results indicate that improved soil gas diffusivity, and hence improved soil aeration, may explain the effect of biochar in reducing N2 O emissions. They also suggest that knowledge of D p/ D0 changes may be key to explaining N2 O emissions. | ||
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