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Comparison of N 2 O and CH 4 fluxes from Pannonian natural ecosystems
Author(s) -
Czóbel S.,
Horváth L.,
Szirmai O.,
Balogh J.,
Pintér K.,
Németh Z.,
ÜRmös Zs.,
Grosz B.,
Tuba Z.
Publication year - 2010
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.2010.01275.x
Subject(s) - environmental science , wetland , deciduous , grassland , loess , water content , ecosystem , hydrology (agriculture) , atmospheric sciences , vegetation (pathology) , soil water , ecology , soil science , geology , medicine , geotechnical engineering , pathology , geomorphology , biology
Static chamber measurements of nitrous oxide (N 2 O) and methane (CH 4 ) fluxes were made from five characteristic vegetation types, representing three different natural ecosystems (grasslands, deciduous forest and wetlands) in the Pannonian basin, Hungary. The main objective of the study was to determine the drivers of average seasonal, annual and interannual N 2 O and CH 4 fluxes in these different ecosystems to enable more accurate predictions of responses to future climatic conditions. Investigations into the response of net N 2 O and CH 4 emission rates to soil temperature and soil water content were carried out over a 2‐year period. Both N 2 O and CH 4 fluxes covered a wide range. Yearly average N 2 O emissions ranged from 4.38 mg N m −2 year −1 for wetland poplar forest to 242 mg N m −2 year −1 for mountain oak forest. Yearly average soil fluxes of CH 4 varied from oxidation, −106 mg CH 4 m −2 year −1 , for loess grassland to an emission of 129 mg CH 4 m −2 year −1 for a wetland Glyceria stand. Multiple regression analyses showed that N 2 O fluxes from the Pannonian grasslands and oak forest were more dependent than CH 4 fluxes on the key soil variables water content and temperature. The largest seasonal mean N 2 O emission, 319 mg N m −2 year −1 , from a mountain oak forest, was observed in summer, and the largest seasonal mean CH 4 emission, equivalent to an annual rate of 423 mg CH 4 m −2 year −1 , from a wetland Glyceria stand, was found in the spring of the wet year.