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Tree allocation dynamics beyond heat and hot drought stress reveal changes in carbon storage, belowground translocation and growth

Rehschuh, R.; Rehschuh, S.; Gast, A.; Jakab, A.-L.; Lehmann, M. M.; Saurer, M.; Gessler, A.; Ruehr, N. K. ORCID iD icon


Heatwaves combined with drought affect tree functioning with as yet undetermined legacy effects on carbon (C) and nitrogen (N) allocation.
We continuously monitored shoot and root gas exchange, δ13CO2 of respiration and stem growth in well-watered and drought-treated Pinus sylvestris (Scots pine) seedlings exposed to increasing daytime temperatures (max. 42°C) and evaporative demand. Following stress release, we used 13CO2 canopy pulse-labeling, supplemented by soil-applied 15N, to determine allocation to plant compartments, respiration and soil microbial biomass (SMB) over 2.5 wk.
Previously heat-treated seedlings rapidly translocated 13C along the long-distance transport path, to root respiration (Rroot; 7.1 h) and SMB (3 d). Furthermore, 13C accumulated in branch cellulose, suggesting secondary growth enhancement. However, in recovering drought-heat seedlings, the mean residence time of 13C in needles increased, whereas C translocation to Rroot was delayed (13.8 h) and 13C incorporated into starch rather than cellulose. Concurrently, we observed stress-induced low N uptake and aboveground allocation.
C and N allocation during early recovery were affected by stress type and impact. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000140549
Veröffentlicht am 03.12.2021
DOI: 10.1111/nph.17815
Zitationen: 9
Web of Science
Zitationen: 8
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0028-646X, 1469-8137
KITopen-ID: 1000140549
HGF-Programm 12.11.24 (POF IV, LK 01) Adaptation of natural landscapes to climate change
Erschienen in New Phytologist
Verlag John Wiley and Sons
Band 233
Heft 2
Seiten 687-704
Nachgewiesen in Web of Science
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