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Hikino, K.* ; Danzberger, J. ; Riedel, V.P.* ; Hesse, B.D.* ; Hafner, B.D.* ; Gebhardt, T.* ; Rehschuh, R.* ; Ruehr, N.K.* ; Brunn, M.* ; Bauerle, T.L.* ; Landhäusser, S.M.* ; Lehmann, M.M.* ; Rötzer, T.* ; Pretzsch, H.* ; Buegger, F. ; Weikl, F. ; Pritsch, K. ; Grams, T.E.E.*

Dynamics of initial carbon allocation after drought release in mature Norway spruce-Increased belowground allocation of current photoassimilates covers only half of the carbon used for fine-root growth.

Glob. Change Biol. 28, 6889-6905 (2022)
Publ. Version/Full Text Research data DOI PMC
Open Access Gold (Paid Option)
Creative Commons Lizenzvertrag
After drought events, tree recovery depends on sufficient carbon (C) allocation to the sink organs. The present study aimed to elucidate dynamics of tree-level C sink activity and allocation of recent photoassimilates (Cnew ) and stored C in c. 70-year-old Norway spruce (Picea abies) trees during a 4-week period after drought release. We conducted a continuous, whole-tree 13 C labeling in parallel with controlled watering after 5 years of experimental summer drought. The fate of Cnew to growth and CO2 efflux was tracked along branches, stems, coarse- and fine roots, ectomycorrhizae and root exudates to soil CO2 efflux after drought release. Compared with control trees, drought recovering trees showed an overall 6% lower C sink activity and 19% less allocation of Cnew to aboveground sinks, indicating a low priority for aboveground sinks during recovery. In contrast, fine-root growth in recovering trees was seven times greater than that of controls. However, only half of the C used for new fine-root growth was comprised of Cnew while the other half was supplied by stored C. For drought recovery of mature spruce trees, in addition to Cnew , stored C appears to be critical for the regeneration of the fine-root system and the associated water uptake capacity.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Picea Abies ; 13c Labeling ; Belowground Carbon Allocation ; Carbon Partitioning ; Climate Change ; Drought Recovery ; Forest Ecosystems ; Watering
ISSN (print) / ISBN 1354-1013
e-ISSN 1365-2486
Journal Global Change Biology
Quellenangaben Volume: 28, Issue: 23, Pages: 6889-6905 Article Number: , Supplement: ,
Publisher Wiley
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Biochemical Plant Pathology (BIOP)
Research Unit Environmental Simulation (BIOP-EUS)
Helmholtz AI - KIT (HAI - KIT)
Grants Technische Universität München
Deutsche Bundesstiftung Umwelt
Deutsche Forschungsgemeinschaft