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Effects of elevated CO 2 and N deposition on CH 4 emissions from European mires
Author(s) -
Silvola J.,
Saarnio S.,
Foot J.,
Sundh I.,
Greenup A.,
Heijmans M.,
Ekberg A.,
Mitchell E.,
van Breemen N.
Publication year - 2003
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/2002gb001886
Subject(s) - peat , transect , methane , vegetation (pathology) , environmental chemistry , chemistry , deposition (geology) , environmental science , water table , hydrology (agriculture) , ecology , sediment , geology , groundwater , geomorphology , medicine , geotechnical engineering , biology , organic chemistry , pathology
Methane fluxes were measured at five sites representing oligotrophic peatlands along a European transect. Five study plots were subjected to elevated CO 2 concentration (560 ppm), and five plots to NH 4 NO 3 (3 or 5 g N yr −1 ). The CH 4 emissions from the control plots correlated in most cases with the soil temperatures. The depth of the water table, the pH, and the DOC, N and SO 4 concentrations were only weakly correlated with the CH 4 emissions. The elevated CO 2 treatment gave nonsignificantly higher CH 4 emissions at three sites and lower at two sites. The N treatment resulted in higher methane emissions at three sites (nonsignificant). At one site, the CH 4 fluxes of the N‐treatment plots were significantly lower than those of the control plots. These results were not in agreement with our hypotheses, nor with the results obtained in some earlier studies. However, the results are consistent with the results of the vegetation analyses, which showed no significant treatment effects on species relationships or biomass production.