Denitrification at two nitrogen-polluted, ombrotrophic Sphagnum bogs in Central Europe: Insights from porewater N2O-isotope profiles

0439538 - ÚTIA 2016 RIV GB eng J - Journal Article
Novák, M. - Gebauer, G. - Thoma, M. - Curik, J. - Štěpánová, M. - Jacková, I. - Buzek, F. - Bárta, J. - Santrucková, H. - Fottová, D. - Kuběna, Aleš Antonín
Denitrification at two nitrogen-polluted, ombrotrophic Sphagnum bogs in Central Europe: Insights from porewater N2O-isotope profiles.
Soil Biology and Biochemistry. Roč. 81, č. 1 (2015), s. 48-57. ISSN 0038-0717
Grant - others:GA ČR(CZ) GAP504/12/1782
Institutional support: RVO:67985556
Keywords : Denitrification * Nitrogen isotopes * Nitrous oxide * Ombrotrophic bog * Porewater * Sphagnum * Wetland * Engineering controlled terms * Meteorological problems
Subject RIV: DD - Geochemistry
Impact factor: 4.152, year: 2015
http://library.utia.cas.cz/separaty/2015/E/kubena-0439538.pdf

Measurements of nitrogen isotope ratios (δ15N) along vertical porewater profiles are instrumental in localizing sources and sinks of nitrous oxide (N2O) in wetland ecosystems. We present the first N2O concentration and isotope data for porewaters of ombrotrophic, mountain-top bogs. Our two study sites, situated in the Czech Republic at elevations higher than 1000m, have been affected by atmospheric N pollution for more than 100 years. In recent decades, the northeastern site KB received over 30kgNha-1yr-1via atmospheric deposition, the southwestern site BS was 3 times less polluted. Both peat bogs were surrounded by defoliated, dead spruce stands. We hypothesized that elevated nitrate (NO3 -) inputs in rain-fed bogs may cause sizeable N2O emissions. Porewater N2O concentrations in the studied ombrotrophic bogs were 400-800 times higher, compared to fens in nearby Bavaria (Germany).
Permanent Link: http://hdl.handle.net/11104/0243122