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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/erw121
|2 doi
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|a pubmed24n0862.xml
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|a (NLM)27012285
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Salomón, Roberto
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Seasonal and diel variation in xylem CO2 concentration and sap pH in sub-Mediterranean oak stems
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|c 2016
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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 16.11.2017
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|a Date Revised 12.01.2018
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © The Author 2016. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com.
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|a Since a substantial portion of respired CO2 remains within the stem, diel and seasonal trends in stem CO2 concentration ([CO2]) are of major interest in plant respiration and carbon budget research. However, continuous long-term stem [CO2] studies are scarce, and generally absent in Mediterranean climates. In this study, stem [CO2] was monitored every 15min together with stem and air temperature, sap flow, and soil water storage during a growing season in 16 stems of Quercus pyrenaica to elucidate the main drivers of stem [CO2] at different temporal scales. Fluctuations in sap pH were also assessed during two growing seasons to evaluate potential errors in estimates of the concentration of CO2 dissolved in xylem sap ([CO2*]) calculated using Henry's law. Stem temperature was the best predictor of stem [CO2] and explained more than 90% and 50% of the variability in stem [CO2] at diel and seasonal scales, respectively. Under dry conditions, soil water storage was the main driver of stem [CO2]. Likewise, the first rains after summer drought caused intense stem [CO2] pulses, suggesting enhanced stem and root respiration and increased resistance to radial CO2 diffusion. Sap flow played a secondary role in controlling stem [CO2] variations. We observed night-time sap pH acidification and progressive seasonal alkalinization. Thus, if the annual mean value of sap pH (measured at midday) was assumed to be constant, night-time sap [CO2*] was substantially overestimated (40%), and spring and autumn sap [CO2*] were misestimated by 25%. This work highlights that diel and seasonal variations in temperature, tree water availability, and sap pH substantially affect xylem [CO2] and sap [CO2*]
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Oak (Quercus pyrenaica)
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| 650 |
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4 |
|a sap [CO2] misestimation
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4 |
|a sap pH
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4 |
|a seasonal variation
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|a stem respiration
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|a summer drought
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| 650 |
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|a xylem CO2 transport.
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| 650 |
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|a Carbon Dioxide
|2 NLM
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| 650 |
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|a 142M471B3J
|2 NLM
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| 700 |
1 |
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|a Valbuena-Carabaña, María
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Teskey, Robert
|e verfasserin
|4 aut
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| 700 |
1 |
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|a McGuire, Mary Anne
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Aubrey, Doug
|e verfasserin
|4 aut
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| 700 |
1 |
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|a González-Doncel, Inés
|e verfasserin
|4 aut
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| 700 |
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|a Gil, Luis
|e verfasserin
|4 aut
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| 700 |
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|a Rodríguez-Calcerrada, Jesús
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 67(2016), 9 vom: 01. Apr., Seite 2817-27
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
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|g volume:67
|g year:2016
|g number:9
|g day:01
|g month:04
|g pages:2817-27
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|u http://dx.doi.org/10.1093/jxb/erw121
|3 Volltext
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