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Hikino, K.* ; Danzberger, J. ; Riedel, V.P.* ; Rehschuh, R.* ; Ruehr, N.K.* ; Hesse, B.D.* ; Lehmann, M.M.* ; Buegger, F. ; Weikl, F. ; Pritsch, K. ; Grams, T.E.E.*

High resilience of carbon transport in long-term drought stressed mature Norway spruce trees within two weeks after drought release.

Glob. Change Biol., DOI: 10.1111/gcb.16051 (2021)
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Under ongoing global climate change, drought periods are predicted to increase in frequency and intensity in the future. Under these circumstances, it is crucial for tree´s survival to recover their restricted functionalities quickly after drought release. To elucidate the recovery of carbon (C) transport rates in c. 70-year-old Norway spruce (Picea abies [L.] KARST.) after five years of recurrent summer droughts, we conducted a continuous whole-tree 13 C labeling experiment in parallel with watering. We determined the arrival time of current photoassimilates in major C sinks by tracing the 13 C label in stem and soil CO2 efflux, and tips of living fine roots. In the first week after watering, aboveground C transport rates from crown to trunk base were still 50% lower in previously drought-stressed trees (0.16 ± 0.01 m h-1 ) compared to controls (0.30 ± 0.06 m h-1 ). Conversely, C transport rates below ground, i.e. from the trunk base to soil CO2 efflux were already similar between treatments (c. 0.03 m h-1 ). Two weeks after watering, aboveground C transport of previously drought-stressed trees recovered to the level of the controls. Furthermore, regrowth of water-absorbing fine roots upon watering was supported by faster incorporation of 13 C label in previously drought-stressed (within 12 ± 10 h upon arrival at trunk base) compared to control trees (73 ± 10 h). Thus, the whole-tree C transport system from the crown to soil CO2 efflux fully recovered within two weeks after drought release, and hence showed high resilience to recurrent summer droughts in mature Norway spruce forests. This high resilience of the C transport system is an important prerequisite for the recovery of other tree functionalities and productivity.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Picea Abies ; 13c-labeling ; Climate Change ; Forest Ecosystem ; Phloem ; Photosynthesis ; Recovery ; Soil Co2 Efflux ; Stem Co2 Efflux ; Watering; Phloem Transport; Fagus-sylvatica; Picea-abies; European Beech; Isotopic Abundances; Soil Respiration; Allocation; Mortality; Xylem; Co2
Language english
Publication Year 2021
HGF-reported in Year 2021
ISSN (print) / ISBN 1354-1013
e-ISSN 1365-2486
Journal Global Change Biology
Publisher Wiley
Publishing Place 111 River St, Hoboken 07030-5774, Nj Usa
Reviewing status Peer reviewed
Institute(s) Institute of Biochemical Plant Pathology (BIOP)
Research Unit Environmental Simulation (EUS)
POF-Topic(s) 30202 - Environmental Health
Research field(s) Environmental Sciences
PSP Element(s) G-504900-001
G-504911-001
G-504900-002
Grants Food, Agriculture and Forestry
Bavarian State Ministries of the Environment and Consumer Protection
Schweizerischer Nationalfonds zur Forderung der Wissenschaftlichen Forschung
Deutsche Bundesstiftung Umwelt
Deutsche Forschungsgemeinschaft
DOI 10.1111/gcb.16051
WOS ID WOS:000735426000001
Scopus ID 85122101758
PubMed ID 34927319
Erfassungsdatum 2022-01-31
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