Newly plant-derived carbon in the deeper vadose zone of a sandy agricultural soil does not stimulate denitrification

• Published in: Geoderma Vol. 448; p. 116936
• Main Authors: Xu, Wenyi, Lennart Ambus, Per
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2024; Elsevier
• Subjects: absorbance; agricultural soils; aluminum; barley; beets; Bulk soil carbon; carbon; carbon sequestration; carbon sinks; corn; denitrification; Denitrification enzyme activity; enzyme activity; grasses; groundwater; Hot- and cold-water extractable carbon; Incubation experiment; iron; Markvetenskap; nitrates; Respired CO2-C; soil profiles; soil respiration; Soil Science; temperature; Ultraviolet visible spectral analyse; vadose zone; vegetation; δ13C signature; Respired CO2-C; Ultraviolet visible spectral analyse; Bulk soil carbon; Denitrification enzyme activity; δ13C signature; Incubation experiment; Hot- and cold-water extractable carbon

•δ13C in bulk C showed no C4-plant-derived C 20 years past C3-C4 plant transition.•δ13C in DOC and respired C revealed C4-plant derived C allocation in deep vadose zone.•Cold-DOC and its chemical lability increased at soil depths below 130 cm.•Soil respiration or denitrification enzyme activity did...