Nadine Tauchnitz, Rolf Russow, Sabine Bernsdorf, Ralph Meissner
Proceedings of the 14th International Peat Congress
denitrification, dissimilatory-nitrate-reduction, peatlands
Theme X. Peatland carbon budgets and greenhouse gas (GHG) fluxes
The present study was aimed at determining the consumption of nitrate (NO3–) and pathways of NO3– transformation using a [15N]NO3–/bromide double-tracer approach . Under field condi-tions in the rewetted peat sites 15NO3– consumption occurred rapidly with more than 50 % NO3– consumed within 2 days and 100 % within 8 days after tracer application. Concomitant-ly 15N abundances of different soil water N compounds (ammonium, nitrite) increased con-siderably and lead to the conclusion that, besides commonly known NO3– reduction to nitrite (i.e. denitrification), a reduction of NO3– to ammonium based on added 15NO3– has simultane-ously taken place.