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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.2011.03848.x
|2 doi
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|a DE-627
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|a eng
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1 |
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|a Barthel, Matthias
|e verfasserin
|4 aut
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|a The diel imprint of leaf metabolism on the δ13 C signal of soil respiration under control and drought conditions
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 12.03.2012
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|a Date Revised 20.05.2021
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|a published: Print-Electronic
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|a ErratumIn: New Phytol. 2014 Jun;202(4):1412. - PMID 33892584
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|a Citation Status MEDLINE
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|a © 2011 The Authors. New Phytologist © 2011 New Phytologist Trust.
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|a Recent (13) CO(2) canopy pulse chase labeling studies revealed that photosynthesis influences the carbon isotopic composition of soil respired CO(2) (δ(13) C(SR)) even on a diel timescale. However, the driving mechanisms underlying these short-term responses remain unclear, in particular under drought conditions. The gas exchange of CO(2) isotopes of canopy and soil was monitored in drought/nondrought-stressed beech (Fagus sylvatica) saplings after (13) CO(2) canopy pulse labeling. A combined canopy/soil chamber system with gas-tight separated soil and canopy compartments was coupled to a laser spectrometer measuring mixing ratios and isotopic composition of CO(2) in air at high temporal resolution. The measured δ(13) C(SR) signal was then explained and substantiated by a mechanistic carbon allocation model. Leaf metabolism had a strong imprint on diel cycles in control plants, as a result of an alternating substrate supply switching between sugar and transient starch. By contrast, diel cycles in drought-stressed plants were determined by the relative contributions of autotrophic and heterotrophic respiration throughout the day. Drought reduced the speed of the link between photosynthesis and soil respiration by a factor of c. 2.5, depending on the photosynthetic rate. Drought slows the coupling between photosynthesis and soil respiration and alters the underlying mechanism causing diel variations of δ(13) C(SR)
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Carbon Isotopes
|2 NLM
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|a Soil
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|a Carbon
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|a 7440-44-0
|2 NLM
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|a Hammerle, Albin
|e verfasserin
|4 aut
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|a Sturm, Patrick
|e verfasserin
|4 aut
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|a Baur, Thomas
|e verfasserin
|4 aut
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|a Gentsch, Lydia
|e verfasserin
|4 aut
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|a Knohl, Alexander
|e verfasserin
|4 aut
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|i Enthalten in
|t The New phytologist
|d 1979
|g 192(2011), 4 vom: 01. Dez., Seite 925-938
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|x 1469-8137
|7 nnns
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|g volume:192
|g year:2011
|g number:4
|g day:01
|g month:12
|g pages:925-938
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|u http://dx.doi.org/10.1111/j.1469-8137.2011.03848.x
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