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| Titel |
Quantification of parameters controlling the carbon stocks in German agricultural soils |
| VerfasserIn |
Cora Vos, Axel Don, Annette Freibauer, Arne Heidkamp, Roland Prietz |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250133422
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| Publikation (Nr.) |
 EGU/EGU2016-14031.pdf |
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| Zusammenfassung |
| Within the framework of UNFCCC, Germany is obligated to report on its greenhouse gas
emissions from soils. This also includes the emissions in the agricultural sector. Changes in
soil carbon stocks are a major source of CO2 that need to be reported. Until now there are
only regional inventories of the soil carbon stocks in the agricultural sector while for the
forestry sector a repeated national inventory exists. In order to report on changes in soil
carbon stocks in agricultural soils, a consistent, representative and quantitative dataset of
agricultural soil properties, especially on carbon stocks and management data is necessary. In
the course of the German Agricultural Soil Inventory 3109 agricultural sites are examined.
Up to January 2016, 2450 sites were sampled. The sites are sampled in five depth increments
and all samples are analyzed in the same laboratory. Of the sampled sites the laboratory
analyses are completed for 1312 sites. The samples of all depth increments were analyzed
for their texture, bulk density, pH, electric conductivity, stone and root content,
organic and inorganic carbon content and nitrogen content. The data are coupled
with management data covering the past ten years and with climate data. They
are analyzed with multivariate statistical techniques (e.g. mixed effects models,
additive models, random forest) to quantify the parameters that control the carbon
stocks in German agricultural soils. First descriptive results show that the mean
soil carbon stocks down to a depth of 100 cm are 126.1 t ha−1 (range 8.9-1158.9 t
ha−1). The mean stocks only for croplands are 102.6 t ha−1 (range 8.9-1158.9 t
ha−1), while for grasslands the mean stock is 184.1 t ha−1 (range 19.4-937.8 t
ha−1). In total the soil scientists found a surprisingly high proportion of disturbed
and unusual soil profiles, indicating intensive human modifications of agricultural
soils through e.g. deep ploughing. The data set of the German Agricultural Soil
Inventory is the first one to combine data on soil properties with management and
climate data on a national scale. Its magnitude allows gaining conclusions on the
parameters controlling the carbon stocks in the soils despite a high natural variability. |
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