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Ludwig, B.* ; Jäger, N.* ; Priesack, E. ; Flessa, H.*

Application of the DNDC model to predict N2O emissions from sandy arable soils with differing fertilization in a long-term experiment.

J. Plant Nutr. Soil Sci. 174, 350-358 (2011)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Modeling crop growth and soil N dynamics is difficult due to the complex nature of soil-plant systems. In several studies, the DNDC model has been claimed to be well-suited for this purpose whereas in other studies applications of the model were less successful. Objectives of this study were to test a calibration and validation scheme for DNDC-model applications to describe a field experiment with spring wheat on a sandy soil near Darmstadt (SW Germany) using different fertilizer types (either application of mineral fertilizer and straw-MSI; or application of farmyard manure-FYM) and rates (low-MSI(L), FYM(L); and medium-MSI(M), FYM(M)). The model test is based on a model parameterization to best describe the case MSI(L) and applies this parameterization for a retrospective simulation of the other cases (MSIM, FYML, FYMM) including crop growth and N(2)O emissions. Soil water contents were not accurately simulated using either the DNDC default values for a loamy sand or for the next finer texture class or using results from the pedotransfer function provided by ROSETTA. After successful calibration of the soil water flow model using a soil texture class that led to the best fit of the measured water content data, grain yield of spring wheat and cumulative N(2)O emission were slightly underestimated by DNDC and were between 91% and 86% of the measured data. A subsequent calibration of the yields and cumulative N(2)O emissions from soils of the MSIL treatment gave a good prediction of crop growth and N(2)O emissions in the MSIM treatment, but a marked underestimation of yields of the FYM treatments. Cumulative N(2)O emissions were predicted well for all MSI and FYM treatments, but seasonal dynamics were not. Overall, our results indicated that for the sandy soil in Germany, site-specific calibration was essentially required for the soil hydrology and that a calibration was useful for a subsequent prediction where greater amounts of the same fertilizer were used, but not useful for a prediction with a different fertilizer type.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter crop growth; DNDC; farmyardmanure; fertilization; greenhouse gases; long-term experiment; model calibration; N(2)O
ISSN (print) / ISBN 1436-8730
e-ISSN 1522-2624
Zeitschrift Journal of Plant Nutrition and Soil Science
Quellenangaben Band: 174, Heft: 3, Seiten: 350-358 Artikelnummer: , Supplement: ,
Verlag Wiley
Verlagsort Weinheim
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Soil Ecology (IBOE)