Cite as:
Surey, R.; Schimpf, C.M.; Sauheitl, L.; M&uuml;ller, C.; Rummel, P.; Dittert, K.; Kaiser, K.; B&ouml;ttcher, J. &amp; Mikutta, R. (2020): <b>Potential denitrification stimulated by water-soluble organic carbon from plant residues during initial decomposition</b>. <i>Soil Biology and Biochemistry</i> <b>147</b>, 107841<br>DOI: <a href="" target="_blank"></a>.

Resource Description

Title: Potential denitrification stimulated by water-soluble organic carbon from plant residues during initial decomposition
FOR816dw ID: 28
Publication Date: 2020-05-18
License and Usage Rights: DASIM data user agreement. (
Resource Owner(s):
Individual: Ronny Surey
Individual: Corinna M. Schimpf
Individual: Leopold Sauheitl
Individual: Carsten Müller
Individual: Pauline Rummel
Individual: Klaus Dittert
Individual: Klaus Kaiser
Individual: Jürgen Böttcher
Individual: Robert Mikutta
Denitrification usually takes place under anoxic conditions and over short periods of time, and depends on readily available nitrate and carbon sources. Variations in CO2 and N2O emissions associated with plant residues have mainly been explained by differences in their decomposability. A factor rarely considered so far is water-extractable organic matter (WEOM) released to the soil during residue decomposition. Here, we examined the potential effect of plant residues on denitrification with special emphasis on WEOM. A range of fresh and leached plant residues was characterized by elemental analyses, 13C-NMR spectroscopy, and extraction with ultrapure water. The obtained solutions were analyzed for the concentrations of organic carbon (OC) and organic nitrogen (ON), and by UV-VIS spectroscopy. To test the potential denitrification induced by plant residues or three different OM solutions, these carbon sources were added to soil suspensions and incubated for 24 h at 20 °C in the dark under anoxic conditions; KNO3 was added to ensure unlimited nitrate supply. Evolving N2O and CO2 were analyzed by gas chromatography, and acetylene inhibition was used to determine denitrification and its product ratio. The production of all gases, as well as the molar (N2O + N2)–N/CO2–C ratio, was directly related to the water-extractable OC (WEOC) content of the plant residues, and the WEOC increased with carboxylic/carbonyl C and decreasing OC/ON ratio of the plant residues. Incubation of OM solutions revealed that the molar (N2O + N2)–N/CO2–C ratio and share of N2O are influenced by the WEOM's chemical composition. In conclusion, our results emphasize the potential of WEOM in largely undecomposed plant residues to support short-term denitrification activity in a typical ?hot spot–hot moment? situation.
| denitrification product ratio | denitrification potential | N2O | N2 | CO2 | plant residues | decomposition | WEOC | WEON |
Literature type specific fields:
Journal: Soil Biology and Biochemistry
Volume: 147
Page Range: 107841
Metadata Provider:
Individual: Kristina Kleineidam
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