Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1080/10256016.2013.831089
Titel (primär) Nitrate turnover in a peat soil under drained and rewetted conditions: results from a [15N]nitrate-bromide double-tracer study
Autor Russow, R.; Tauchnitz, N.; Spott, O.; Mothes, S.; Bernsdorf, S.; Meissner, R.
Journal / Serie Isotopes in Environmental and Health Studies
Erscheinungsjahr 2013
Department ANA; BOPHY
Band/Volume 49
Heft 4
Seite von 438
Seite bis 453
Sprache englisch
Keywords bromide; denitrification; dissimilatory nitrate reduction; isotope ecology; nitrate consumption; nitrogen 15; peat soil rewetting
UFZ Querschnittsthemen RU1
Abstract Under natural conditions, peatlands are generally nitrate-limited. However, recent concerns about an additional N input into peatlands by atmospheric N deposition have highlighted the risk of an increased denitrification activity and hence the likelihood of a rise of emissions of the greenhouse gas nitrous oxide. Therefore, the aim of the present study was to investigate the turnover of added nitrate in a drained and a rewetted peatland using a [15N]nitrate–bromide double-tracer method. The double-tracer method allows a separation between physical effects (dilution, dispersion and dislocation) and microbial and chemical nitrate transformation by comparing with the conservative Br tracer. In the drained peat site, low NO3 consumption rates have been observed. In contrast, NO3 consumption at the rewetted peat site rises rapidly to about 100% within 4 days after tracer application. Concomitantly, the 15N abundances of nitrite and ammonium in soil water increased and lead to the conclusion that, besides commonly known NO3 reduction to nitrite (i.e. denitrification), a dissimilatory nitrate reduction to ammonium has simultaneously taken place. The present study reveals that increasing NO3 inputs into rewetted peatlands via atmospheric deposition results in a rapid NO3 consumption, which could lead to an increase in N2O emissions into the atmosphere.
dauerhafte UFZ-Verlinkung
Russow, R., Tauchnitz, N., Spott, O., Mothes, S., Bernsdorf, S., Meissner, R. (2013):
Nitrate turnover in a peat soil under drained and rewetted conditions: results from a [15N]nitrate-bromide double-tracer study
Isot. Environ. Health Stud. 49 (4), 438 - 453