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Soil-atmosphere greenhouse gases (CO2, CH4 and N2O) exchange in evergreen oak woodland in southern Portugal

Author

Listed:
  • A. Shvaleva

    (Institute of Technological Chemistry and Biology, New University of Lisbon, Av. República, Oeiras, Portugal
    Institute of Agronomy, Technical University of Lisbon, Tapada da Ajuda, Lisbon, Portugal)

  • R. Lobo-do-Vale

    (Institute of Agronomy, Technical University of Lisbon, Tapada da Ajuda, Lisbon, Portugal)

  • C. Cruz

    (Faculty of Sciences, University of Lisbon (CBA), Lisbon, Portugal)

  • S. Castaldi

    (Second University, Caserta, Italy)

  • A.P. Rosa

    (Faculty of Sciences, University of Lisbon (CBA), Lisbon, Portugal)

  • M.M. Chaves

    (Institute of Technological Chemistry and Biology, New University of Lisbon, Av. República, Oeiras, Portugal
    Institute of Agronomy, Technical University of Lisbon, Tapada da Ajuda, Lisbon, Portugal)

  • J.S. Pereira

    (Institute of Agronomy, Technical University of Lisbon, Tapada da Ajuda, Lisbon, Portugal)

Abstract

A 10-20% decrease in annual precipitation is predicted in the Mediterranean basin, and in particular to the Iberian Peninsula, with foreseen effects on the exchange of soil-atmosphere greenhouse gases (GHGs; CO2, CH4, and N2O). To simulate this scenario, we setup an experimental design in the particularly dry period of 2008-2009 using rainfall exclusion and irrigation, to obtain plots receiving 110% (538 mm), 100% (493 mm) and 74% (365 mm) of the natural precipitation. Soil CO2 fluxes showed a strong increase from summer to autumn as a consequence of increasing soil heterotrophic respiration that resulted from rewetting. Fluxes of N2O were negligible. According to our data, soil was a permanent CH4 sink independent of the soil water content (in the range between 6-26% WFPS - water-filled pore space) and of soil temperature (in the range of 7-28°C), supporting the concept that seasonally dry ecosystems (Mediterranean) may represent a significant sink of atmospheric CH4. The study provides evidence that the 26% decrease or 10% increase in the ambient rainfall from annual precipitation of ca 500 mm did not significantly affect soil functionality and had a limited impact on soil-atmosphere net GHGs exchange in evergreen oak woodlands in southern Portugal.

Suggested Citation

  • A. Shvaleva & R. Lobo-do-Vale & C. Cruz & S. Castaldi & A.P. Rosa & M.M. Chaves & J.S. Pereira, 2011. "Soil-atmosphere greenhouse gases (CO2, CH4 and N2O) exchange in evergreen oak woodland in southern Portugal," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(10), pages 471-477.
    • Handle: RePEc:caa:jnlpse:v:57:y:2011:i:10:id:223-2011-pse
    DOI: 10.17221/223/2011-PSE
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    References listed on IDEAS

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    1. Afonso Do Ó & Maria Roxo, 2008. "Drought events in Southern Portugal from the 12th to the 19th centuries: integrated research from descriptive sources," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 47(1), pages 55-63, October.
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