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| Gjettermann, B.; Styczen, M.; Hansen, H.C.B.; Vinther, F.P.; Hansen, S.. |
| Because dissolved organic matter (DOM) plays an important role is terrestrial C-,N-and P-balances and transport of these three components to aquatic environments, there is a need to include it in models. This paper presents the concept of the newly developed DOM modules implemented in the DAISY model with focus on the quantification of DOM sorption/desorption and microbial-driven DOM turnover. The kinetics of DOM sorption/desorption is described by the deviation of the actual DOM concentration in solution from the equilibrium concentration, Ceq. The Ceq is soil specific and estimated from pedotransfer functions taking into account the soil content of organic matter, Al and Fe oxides. The turnover of several organic matter pools including one DOM pool are... |
| Tipo: Journal paper |
Palavras-chave: Soil. |
| Ano: 2008 |
URL: http://orgprints.org/21148/1/21148.pdf |
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| Styczen, M.; Poulsen, R.N.; Gudbjerg, J.; Gjettermann, B.. |
| Der er gennemført en beregning af udvaskning af nitrat, ammonium, DOC og DON for en konventionel og en økologisk situation i et indsatsområde ved “Søndersø” på Fyn. Beregningerne er udført med DAISY-modellen, indeholdende et nyudviklet DOC/DON-modul og MIKE SHE-modellen. Modelopsætningen, der dækker et noget større område end selve indsatsområdet, baserer sig på den eksisterende arealanvendelse og landbrugssituation for en del af området, og ekstrapoleret i den nordvestlige del. Ekstrapolationen dækker kun en lille del af det faktiske indsatsområde. Modelopsætningerne bygger på tidligere modelleringsstudier i samme område. Koncentrationerne af DOC og DON er stort set ens i de to scenarier på grund af, at den styrende faktor er jordens organiske... |
| Tipo: Report |
Palavras-chave: Farming Systems. |
| Ano: 2005 |
URL: http://orgprints.org/5401/1/5401.pdf |
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| Gjettermann, B.; Styczen, M.; Hansen, S.; Borggaard, O.K.; Hansen, H.C.B.. |
| Molibility of dissolved organic matter (DOM) strongly affects the export of nitrogen (N) and phosphorus (P) from oils to surface waters. To study the sorption an mobility of dissolved organic C and P (DOC, DOP) in soil, the pH-dependent sorption of DOM to samples from Ap, EB, and Bt horizons from a Danish agircultural Humic Hapludult was investigated and a kinetic model applicable in field-scale model tested. Sorption experiments of 1 to 72 h duration were conducted at two pH levels (pH 5.0 and 7.0) and six initial DOC concentrtions (0-4.7 mmol L-1). Most sorption/desorption occurred during the first few hours. Dissolved organic carbon and DOP sorption decreased strongly with increased pH and desorption dominated at pH 7, especially for DOC. Due to... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general; Soil. |
| Ano: 2007 |
URL: http://orgprints.org/21007/4/21007.pdf |
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| Rasmussen, J.; Gjettermann, B.; Eriksen, J.; Jensen, E.S.; Høgh-Jensen, H.. |
| The below ground C and N dynamics leading to organic and inorganic N leaching from perennial ryegrass-clover mixtures are not well understood. Based on the hypothesis that four different plant materials would degrade differently, a 16 months field experiment was conducted to determine (i) the source strength of labelled plant residues in dissolved inorganic N (DIN) and dissolved organic N (DON) in pore water from the plough layer, and (ii) the plant uptake of organically bound N. Litterbags containing 14C- and 15N-labelled ryegrass or clover roots or leaves were inserted into the sward of a ryegrass-clover mixture in early spring. The fate of the released 14C and 15N was monitored in harvested biomass, roots, soil, and pore water percolating from the... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil biology; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/16290/1/16290.pdf |
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