Respiratory fluxes in a Canary Islands pine forest

We estimated component and whole-ecosystem CO₂ efflux (R(ECO)) in a Pinus canariensis Chr. Sm. ex DC stand in Tenerife, Canary Islands, an ecotone with strong seasonal changes in soil water availability. From November 2006 to February 2008, we measured foliage, stem and soil CO₂ efflux by chamber te...

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Veröffentlicht in:Tree physiology 2009-03, Vol.29 (3), p.457-466
Hauptverfasser: Wieser, Gerhard, Gruber, Andreas, Bahn, Michael, Catalá, Enrique, Carrillo, Estefanía, Jiménez, Maria Soledad, Morales, Domingo
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Sprache:eng
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Zusammenfassung:We estimated component and whole-ecosystem CO₂ efflux (R(ECO)) in a Pinus canariensis Chr. Sm. ex DC stand in Tenerife, Canary Islands, an ecotone with strong seasonal changes in soil water availability. From November 2006 to February 2008, we measured foliage, stem and soil CO₂ efflux by chamber techniques. Site-specific CO₂ efflux models obtained from these chamber measurements were then combined with half-hourly measurements of canopy, stem and soil temperature as well as soil water potential, leaf and stem surface area data for scaling up component-specific CO₂ efflux to R(ECO). Integrated over an entire year, R(ECO) was 938 g of C m-2 in 2007 and comprised the following component fluxes: 77% from soil, 11% from stems and 12% from foliage. Whole-ecosystem CO₂ efflux varied markedly throughout the year. During the cold and wet season, R(ECO) generally followed the seasonal trends in temperature, and during the warm and dry summer, however, R(ECO) was significantly reduced because of limited soil water availability in the main rooting horizon.
ISSN:0829-318X
1758-4469
DOI:10.1093/treephys/tpp008