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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1111/nph.15302
|2 doi
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|a pubmed24n0956.xml
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|a eng
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|a Muhr, Jan
|e verfasserin
|4 aut
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| 245 |
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|a Living on borrowed time - Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 01.10.2019
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.
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|a Nonstructural carbon (NSC) reserves act as buffers to sustain tree activity during periods when carbon (C) assimilation does not meet C demand, but little is known about their age and accessibility; we designed a controlled girdling experiment in the Amazon to study tree survival on NSC reserves. We used bomb-radiocarbon (14 C) to monitor the time elapsed between C fixation and release ('age' of substrates). We simultaneously monitored how the mobilization of reserve C affected δ13 CO2 . Six ungirdled control trees relied almost exclusively on recent assimilates throughout the 17 months of measurement. The Δ14 C of CO2 emitted from the six girdled stems increased significantly over time after girdling, indicating substantial remobilization of storage NSC fixed up to 13-14 yr previously. This remobilization was not accompanied by a consistent change in observed δ13 CO2 . These trees have access to storage pools integrating C accumulated over more than a decade. Remobilization follows a very clear reverse chronological mobilization with younger reserve pools being mobilized first. The lack of a shift in the δ13 CO2 might indicate a constant contribution of starch hydrolysis to the soluble sugar pool even outside pronounced stress periods (regular mixing)
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|a Journal Article
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|a carbon reserves
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|a nonstructural carbohydrates
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|a radiocarbon
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|a tree girdling
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|a tree survival
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|a Carbon Isotopes
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|a Carbon Dioxide
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|a Higuchi, Niro
|e verfasserin
|4 aut
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|a Kunert, Norbert
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 220(2018), 1 vom: 07. Okt., Seite 111-120
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|x 1469-8137
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|g volume:220
|g year:2018
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|g month:10
|g pages:111-120
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|u http://dx.doi.org/10.1111/nph.15302
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