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Open Access Green as soon as Postprint is submitted to ZB.
Drought effects on allocation of recent carbon: From beech leaves to soil CO₂ efflux.
New Phytol. 184, 950-961 (2009)
Recent studies have highlighted a direct, fast transfer of recently assimilated C from the tree canopy to the soil. However, the effect of environmental changes on this flux remains largely unknown. * We investigated the effects of drought on the translocation of recently assimilated C, by pulse-labelling 1.5-yr-old beech tree mesocosms with (13)CO(2). (13)C signatures were then measured daily for 1 wk in leaves, twigs, coarse and fine root water-soluble and total organic matter, phloem organic matter, soil microbial biomass and soil CO(2) efflux. * Drought reduced C assimilation and doubled the residence time of recently assimilated C in leaf biomass. In phloem organic matter, the (13)C label peaked immediately after labelling then decayed exponentially in the control treatment, while under drought it peaked 4 d after labelling. In soil microbial biomass, the label peaked 1 d after labelling in the control treatment, whereas under drought no peak was measured. Two days after labelling, drought decreased the contribution of recently assimilated C to soil CO(2) efflux by 33%. * Our study showed that drought reduced the coupling between canopy photosynthesis and belowground processes. This will probably affect soil biogeochemical cycling, with potential consequences including slower soil nitrogen cycling and changes in C-sequestration potential under future climate conditions.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
13C; Fagus sylvatica; isotopes; labelling; pholem; soil microbes; translocation; water stress
ISSN (print) / ISBN
0028-646X
e-ISSN
1469-8137
Journal
New Phytologist
Quellenangaben
Volume: 184,
Issue: 4,
Pages: 950-961
Publisher
Wiley
Publishing Place
Malden
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Environmental Simulation (EUS)