We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
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.
- Authors
Hikino, Kyohsuke; Danzberger, Jasmin; Riedel, Vincent P.; Hesse, Benjamin D.; Hafner, Benjamin D.; Gebhardt, Timo; Rehschuh, Romy; Ruehr, Nadine K.; Brunn, Melanie; Bauerle, Taryn L.; Landhäusser, Simon M.; Lehmann, Marco M.; Rötzer, Thomas; Pretzsch, Hans; Buegger, Franz; Weikl, Fabian; Pritsch, Karin; Grams, Thorsten E. E.
- Abstract
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 13C 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.
- Subjects
DROUGHTS; NORWAY spruce; PLANT exudates; ROOT growth; SILVER fir; TREE growth; CARBON; ECTOMYCORRHIZAS
- Publication
Global Change Biology, 2022, Vol 28, Issue 23, p6889
- ISSN
1354-1013
- Publication type
Article
- DOI
10.1111/gcb.16388