NDLI: Long-term 13C labeling provides evidence for temporal and spatial carbon allocation patterns in mature Picea abies

Content Provider	Springer Nature Link
Author	Mildner, Manuel Bader, Martin K. F. Leuzinger, Sebastian Siegwolf, Rolf T. W. Körner, Christian
Copyright Year	2014
Abstract	There is evidence of continued stimulation of foliage photosynthesis in trees exposed to elevated atmospheric CO2 concentrations; however, this is mostly without a proportional growth response. Consequently, we lack information on the fate of this extra carbon (C) acquired. By a steady application of a 13CO2 label in a free air CO2 enrichment (FACE) experiment, we traced the fate of C in 37-m-tall, ca. 110-year-old Picea abies trees in a natural forest in Switzerland. Hence, we are not reporting tree responses to elevated CO2 (which would require equally 13C labeled controls), but are providing insights into assimilate processing in such trees. Sunlit needles and branchlets grow almost exclusively from current assimilates, whereas shaded parts of the crowns also rely on stored C. Only 2.5 years after FACE initiation, tree rings contained 100 % new C. Stem-respiratory CO2 averaged 50 % of new C over the entire FACE period. Fine roots and mycorrhizal fungi contained 49–56 and 26–43 % new C, respectively, after 2.5 years. The isotopic signals in soil CO2 arrived 12 days after the onset of FACE, yet it contained only ca. 15 % new C thereafter. We conclude that new C first feeds into fast turnover C pools in the canopy and becomes increasingly mixed with older C sources as one moves away (downward) from the crown. We speculate that enhanced C turnover (its metabolic cost) along the phloem path, as evidenced by basipetal isotope signal depletion, explains part of the ‘missing carbon’ in trees that assimilated more C under elevated CO2.
Starting Page	747
Ending Page	762
Page Count	16
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	175
Issue Number	3
e-ISSN	14321939
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-04-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon isotopes Elevated CO2 FACE Forest Respiration Ecology Plant Sciences Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Data from: Growth and carbon relations of mature Picea abies trees under 5 years of free-air CO2 enrichment (Dataset)

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Data from: Growth and carbon relations of mature Picea abies trees under 5 years of free-air CO2 enrichment (Dataset)

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