Potential denitrification stimulated by water-soluble organic carbon from plant residues during initial decomposition
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Potential denitrification stimulated by water-soluble organic carbon from plant residues during initial decomposition. / Surey, Ronny; Schimpf, Corinna M.; Sauheitl, Leopold; Mueller, Carsten W.; Rummel, Pauline S.; Dittert, Klaus; Kaiser, Klaus; Böttcher, Jürgen; Mikutta, Robert.
In: Soil Biology and Biochemistry, Vol. 147, 107841, 2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Potential denitrification stimulated by water-soluble organic carbon from plant residues during initial decomposition
AU - Surey, Ronny
AU - Schimpf, Corinna M.
AU - Sauheitl, Leopold
AU - Mueller, Carsten W.
AU - Rummel, Pauline S.
AU - Dittert, Klaus
AU - Kaiser, Klaus
AU - Böttcher, Jürgen
AU - Mikutta, Robert
PY - 2020
Y1 - 2020
N2 - 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 ˈhot spot–hot momentˈ situation.
AB - 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 ˈhot spot–hot momentˈ situation.
KW - Chemical composition of organic matter
KW - Crop residues
KW - Denitrification potential
KW - NO/(NO+N) ratio
KW - Root exudates
KW - Water-extractable organic carbon
U2 - 10.1016/j.soilbio.2020.107841
DO - 10.1016/j.soilbio.2020.107841
M3 - Journal article
AN - SCOPUS:85085236184
VL - 147
JO - Soil Biology & Biochemistry
JF - Soil Biology & Biochemistry
SN - 0038-0717
M1 - 107841
ER -
ID: 242406519