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| Titel |
Simple pedotransfer functions to initialize reactive carbon pools of the RothC model |
| VerfasserIn |
Lutz Weihermueller, Alexander Graf, Michael Herbst, Harry Vereecken |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072648
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| Zusammenfassung |
| Modelling of carbon turnover is a widely used tool to estimate soil carbon stock changes as a
response to climate and land use change. Carbon turnover models are increasingly used not
only at the point scale but also on regional and continental scales, whereby the
Rothamsted Carbon Model (RothC) is a widely used model due to its simplicity and easy
implementation. For the initialization of the RothC model, knowledge about the carbon
pool sizes is essential. Their characterization can be either obtained from physical
fractionation or equilibrium model runs, but both approaches are time consuming and
tedious, especially for larger scale simulations. In this study, a pedotransfer functions
(PTF) for the estimation of all active carbon pools of the RothC model is presented.
As independent variables only total organic carbon (TOC) and clay content are
necessary, which are easily available at most scales. For validation of PTFs the
resistant plant material (RPM) stock estimated from physical fractionation of soil
originating from a wide range of soil types was predicted with a R2 of 0.70. In a second
step, associated errors induced by the use of PTFs were analysed using simulation
runs for a 100 year time period. Therefore, the model was either initialized by the
carbon pools extracted from physical fractionation or the PTF. Maximum relative
deviation in TOC content were small (< 9 %) and declined to < 4 % after 100 years.
Further, absolute errors were in the range of measurement error for soil organic
carbon. Therefore, we propose to use PTFs to initialize the RothC model whenever
physical fractionation is not feasible or equilibrium runs are considered too tedious. |
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