Artikkelit jotka sisältää sanan 'respiration'

Anna M. Laine, Kenneth A. Byrne, Gerard Kiely, Eeva-Stiina Tuittila. Vedenpinnan muutoksen lyhytaikaiset vaikutukset hiilidioksidi- ja metaanipäästöihin peittosuolla.
English title: The short-term effect of altered water level on carbon dioxide and methane fluxes in a blanket bog.
Avainsanat: Sphagnum; Drainage; peatland; methane; flooding; ecohydrology; photosynthesis; respiration; Racomitrium; Rhynchospora alba
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Peatlands play an important role in the global carbon (C) cycle, by acting as a large, long-term C sink. The C sink is sustained by a high water level that inhibits decomposition of organic matter. The C gas dynamics are therefore sensitive to changes in water level, and in climatically different years a peatland can vary from a sink to a source of C. We measured carbon dioxide (CO2) and methane (CH4) fluxes from vegetation communities ranging from hummocks to low lawns in a blanket bog. After a one-year calibration period the water level was both lowered and raised experimentally and the changes in vegetation composition and gas fluxes were monitored during a further year. In all vegetation communities the water level drawdown increased the respiration rate and decreased methane emission; rising water level decreased respiration and increased methane emissions. The effect of altered water level on photosynthesis depended on species composition. Water level drawdown decreased photosynthesis in most communities; rising water level decreased the photosynthesis of hummocks species, and increased the photosynthesis of Rhynchospora alba.
  • Laine, Anna M. Laine, Department of Civil and Environmental Engineering, University College Cork, Cork, Ireland; University of Oulu, Oulu, Finland, P.O. Box 3000, 90014 University of Oulu, telephone: +358 8 5531521, email: Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Byrne, Sähköposti: ei.tietoa@nn.oo
  • Kiely, Sähköposti: ei.tietoa@nn.oo
  • Tuittila, Sähköposti: ei.tietoa@nn.oo
Jouko Silvola, Alm Jukka, Urpo Ahlholm. The effect of plant roots on C02 release from peat soil.
Avainsanat: Decomposition; Carbon allocation; soil respiration
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The contribution of roots to the release of C02 from peat has been examined in both field and laboratory experiments. In the field experiment, columns of peat were isolated from the surrounding peat and the green parts of the plants were continually removed in order to exhaust the living roots contained within the column. The isolated columns released c. 10-20% less C02 than the reference spots where only the growth of the green parts was restrained. C02 production in isolated columns was thereby reduced mostly in mire site types with largest dwarf shrub root biomass. In the greenhouse experiment, C02 release was c. 36% greater from containers containing willow (Salix phylicifolia) roots than from bare peat reference containers. Keywords: Carbon allocation, decomposition, soil respiration
  • Silvola, Department of Biology, University of Joensuu, P.O. Box 111, FIN-80J0/ Joensuu, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Jukka, Sähköposti: ei.tietoa@nn.oo
  • Ahlholm, Sähköposti: ei.tietoa@nn.oo

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