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| Titel |
Influence of soil erosion on CO2 exchange within the CarboZALF manipulation experiment |
| VerfasserIn |
Mathias Hoffmann, Jürgen Augustin, Michael Sommer |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089254
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| Publikation (Nr.) |
 EGU/EGU2014-3451.pdf |
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| Zusammenfassung |
| Agriculture in the hummocky ground moraine landscape of NE-Germany is characterized by
an increase in energy crop cultivation, like maize or sorghum. Both enhance lateral C fluxes
by erosion and induce feedbacks on C dynamics of agroecosystems as a result of the time
limited land cover and the vigorous crop growth. However, the actual impact of these
phenomena on the CO2-sink/-source function of agricultural landscapes, is still not
clear.
Therefore we established the interdisciplinary project “CarboZALF” in 2009. In our field
experiment CarboZALF-D we are monitoring CO2 fluxes for soil-plant systems, which
cover all landscape relevant soil states in respect to erosion and deposition, like
Albic Cutanic Luvisol, Calcic Cutanic Luvisol, Calcaric Regosol and Endogleyic
Colluvic Regosol. Furthermore, we induced erosion / deposition in a manipulation
experiment.
Automated chamber systems (2.5 m, basal area 1 m2, transparent) are placed at the
manipulated sites as well as at one site neither influenced by erosion, nor by deposition. CO2
flux modelling of high temporal resolution includes ecosystem respiration (Reco), gross
primary productivity (GPP) and net ecosystem exchange (NEE) based on parallel and
continuous measurements of the CO2 exchange, soil and air temperatures as well
as photosynthetic active radiation (PAR). Modelling includes gap filling which
is needed in case of chamber malfunctions and abrupt disturbances by farming
practice.
In our presentation we would like to show results of the CO2 exchange measurements for
one year. Differences are most pronounced between the non-eroded and the colluvial
soil: The Endogleyic Colluvic Regosol showed higher flux rates for Reco and NEE
compared to the Albic Cutanic Luvisol. The eroded soil (Calcic Cutanic Luvisol)
demonstrated CO2fluxes intermediate between the non-affected and depositional site.
Site-specific consequences for the soil C stocks will be also discussed in the presentation. |
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