Ecophysiological studies in the Bodrogköz: Measurement of yearly C and N2O balance in typical wetland habitats of the Bodrogköz

Szilárd Czóbel, László Horváth, Bernadett Gál, Tibor Szerdahelyi, Orsolya Szirmai, János Nagy, Dániel Cserhalmi, Gábor Fogarasi, Evelin Ramóna Péli, Gyula Rabnecz, Balázs Grosz, Zoltán Tuba

Research output: Contribution to journalArticle

Abstract

On the basis of our measurements and biomass data collected in plant communities of varied physiognomy, texture and diversity it can be stated that those water courses and standing waters with more significant aquatic vegetation can, as a result of intensive C-fixing by submerged and surface vegetation, be regarded as carbon sinks every year on an annual level. In spite of the short life cycle of aquatic vegetation their C-fixing potential is of similar magnitude to that of Hungarian and temperate grasslands.On the basis of our leaf CO2 flux and gas exchange surveys it can be supposed that both the waterside vigorous growers significant primary production herbaceous vegetation and the gallery forests can be considered carbon sinks. On the basis of our studies carried out in the gallery forests we have shown that the soil respiration of softwood forests dominated by poplar species are higher in the vegetation period than in more closed hardwood 332 woods while its deviation was in every case higher than the value of measurements recorded and expected. That is to say that the loss of carbon from soils of the mainly planted areas of poplar is significant which makes the role of this vegetation type in the carbon cycle questionable. Under certain conditions the waterside and floodplain soils tested acted not only as sources but also as sinks of both nitrous oxide and methane, depending on the soil water content. Data collected to date show that the fluxes of both greenhouse gases can be regarded as extremely slight in both waterside herbaceous and floodplain hardwood vegetation. In the case of methane this is due to anaerobic methane production in the instances of higher water content while atmospheric methane is trapped in the soil where there is lower water content. However the nitrous oxide release from the soil was higher in the case of lower water content. On the basis of two years of data series areas without trees tested provided low levels of nitrous oxide emissions and minimal absorption of methane. The N2O flux of treed habitats was also minimal - lower than that of treeless vegetation - emission. Furthermore the methane absorbed was calculated to be higher than that of herbaceous vegetation but still at a low level.

Original languageEnglish
Pages (from-to)331-343
Number of pages13
JournalThaiszia Journal of Botany
Volume19
Issue numberSUPPL. 1
Publication statusPublished - Dec 1 2009

Keywords

  • Carbon dioxide
  • Fluxes
  • Methane
  • Nitrous oxide
  • Wetland

ASJC Scopus subject areas

  • Plant Science

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    Czóbel, S., Horváth, L., Gál, B., Szerdahelyi, T., Szirmai, O., Nagy, J., Cserhalmi, D., Fogarasi, G., Péli, E. R., Rabnecz, G., Grosz, B., & Tuba, Z. (2009). Ecophysiological studies in the Bodrogköz: Measurement of yearly C and N2O balance in typical wetland habitats of the Bodrogköz. Thaiszia Journal of Botany, 19(SUPPL. 1), 331-343.