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| Gattinger, Andreas; Müller, Adrian; Haeni, Matthias; Skinner, Collin; Fliessbach, Andreas; Buchmann, Nina; Mäder, Paul; Stolze, Matthias; Smith, Pete; El-Hage Scialabba, Nadia; Niggli, Urs. |
| It has been suggested that conversion to organic farming contributes to soil carbon sequestration, but until now a comprehensive quantitative assessment has been lacking. Therefore, datasets from 74 studies from pairwise comparisons of organic vs. nonorganic farming systems were subjected to metaanalysis to identify differences in soil organic carbon (SOC). We found significant differences and higher values for organically farmed soils of 0.18±0.06% points (mean ± 95% confidence interval) for SOC concentrations, 3.50 ± 1.08 Mg C ha−1 for stocks, and 0.45 ± 0.21 Mg C ha−1 y−1 for sequestration rates compared with nonorganic management. Metaregression did not deliver clear results on drivers, but differences in external C inputs and crop rotations seemed... |
| Tipo: Journal paper |
Palavras-chave: Soil; Environmental aspects. |
| Ano: 2012 |
URL: http://orgprints.org/21735/1/Gattinger-etal-2012-PNAS-vol109-44.pdf |
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| Gattinger, Andreas; Müller, Adrian; Haeni, Matthias; Skinner, Colin; Fließbach, Andreas; Buchmann, Nina; Mäder, Paul; Stolze, Matthias; Smith, Pete; El-Hage Scialabbad, Nadja; Niggli, Urs. |
| In their letter, Leifeld et al. (1) argue that our metaanalysis to identify differences in soil organic carbon (SOC) between organic (OF) and nonorganic farming [conventional farming (CF)] (2) selected CF systems that were nonrepresentative. This was not the case. We included data from all available pairwise field comparisons between OF and CF identified in the literature. The observed difference in external carbon (C) inputs between OF and CF did not result from a bias in the selection of studies/treatments but was attributable to the fact that the field comparisons we analyzed (2) were not from fertilization experiments but from pairwise farming system comparisons where the design and the underlying treatments reflected the current farming practices in... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions. |
| Ano: 2013 |
URL: http://orgprints.org/25614/1/PNAS-2013-Gattinger-E985.pdf |
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