Stem girdling affects the quantity of CO2 transported in xylem as well as CO2 efflux from soil.
Identifieur interne : 000076 ( Main/Exploration ); précédent : 000075; suivant : 000077Stem girdling affects the quantity of CO2 transported in xylem as well as CO2 efflux from soil.
Auteurs : Jasper Bloemen [Belgique] ; Laura Agneessens ; Lieven Van Meulebroek ; Doug P. Aubrey ; Mary Anne Mcguire ; Robert O. Teskey ; Kathy SteppeSource :
- The New phytologist [ 1469-8137 ] ; 2014.
Descripteurs français
- Wicri :
- geographic : Belgique.
English descriptors
- KwdEn :
- Autotrophic Processes, Belgium, Biological Transport, Carbon Dioxide (metabolism), Cell Respiration, Fructose (metabolism), Glucose (metabolism), Plant Exudates (metabolism), Plant Roots (metabolism), Plant Stems (anatomy & histology), Plant Stems (physiology), Quercus (anatomy & histology), Quercus (physiology), Soil (chemistry), Starch (metabolism), Sucrose (metabolism), Xylem (metabolism).
- MESH :
- chemical , chemistry : Soil.
- chemical , metabolism : Carbon Dioxide, Fructose, Glucose, Plant Exudates, Starch, Sucrose.
- geographic : Belgium.
- anatomy & histology : Plant Stems, Quercus.
- metabolism : Plant Roots, Xylem.
- physiology : Plant Stems, Quercus.
- Autotrophic Processes, Biological Transport, Cell Respiration.
Abstract
There is recent clear evidence that an important fraction of root-respired CO2 is transported upward in the transpiration stream in tree stems rather than fluxing to the soil. In this study, we aimed to quantify the contribution of root-respired CO2 to both soil CO2 efflux and xylem CO2 transport by manipulating the autotrophic component of belowground respiration. We compared soil CO2 efflux and the flux of root-respired CO2 transported in the transpiration stream in girdled and nongirdled 9-yr-old oak trees (Quercus robur) to assess the impact of a change in the autotrophic component of belowground respiration on both CO2 fluxes. Stem girdling decreased xylem CO2 concentration, indicating that belowground respiration contributes to the aboveground transport of internal CO2 . Girdling also decreased soil CO2 efflux. These results confirmed that root respiration contributes to xylem CO2 transport and that failure to account for this flux results in inaccurate estimates of belowground respiration when efflux-based methods are used. This research adds to the growing body of evidence that efflux-based measurements of belowground respiration underestimate autotrophic contributions.
DOI: 10.1111/nph.12568
PubMed: 24400900
Affiliations:
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Le document en format XML
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Aubrey</name></author><author><name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name></author><author><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O" last="Teskey">Robert O. Teskey</name></author><author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name></author></analytic><series><title level="j">The New phytologist</title><idno type="eISSN">1469-8137</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Autotrophic Processes</term><term>Belgium</term><term>Biological Transport</term><term>Carbon Dioxide (metabolism)</term><term>Cell Respiration</term><term>Fructose (metabolism)</term><term>Glucose (metabolism)</term><term>Plant Exudates (metabolism)</term><term>Plant Roots (metabolism)</term><term>Plant Stems (anatomy & histology)</term><term>Plant Stems (physiology)</term><term>Quercus (anatomy & histology)</term><term>Quercus (physiology)</term><term>Soil (chemistry)</term><term>Starch (metabolism)</term><term>Sucrose (metabolism)</term><term>Xylem (metabolism)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Soil</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon Dioxide</term><term>Fructose</term><term>Glucose</term><term>Plant Exudates</term><term>Starch</term><term>Sucrose</term></keywords><keywords scheme="MESH" type="geographic" xml:lang="en"><term>Belgium</term></keywords><keywords scheme="MESH" qualifier="anatomy & histology" xml:lang="en"><term>Plant Stems</term><term>Quercus</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Plant Roots</term><term>Xylem</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Stems</term><term>Quercus</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Autotrophic Processes</term><term>Biological Transport</term><term>Cell Respiration</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Belgique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">There is recent clear evidence that an important fraction of root-respired CO2 is transported upward in the transpiration stream in tree stems rather than fluxing to the soil. In this study, we aimed to quantify the contribution of root-respired CO2 to both soil CO2 efflux and xylem CO2 transport by manipulating the autotrophic component of belowground respiration. We compared soil CO2 efflux and the flux of root-respired CO2 transported in the transpiration stream in girdled and nongirdled 9-yr-old oak trees (Quercus robur) to assess the impact of a change in the autotrophic component of belowground respiration on both CO2 fluxes. Stem girdling decreased xylem CO2 concentration, indicating that belowground respiration contributes to the aboveground transport of internal CO2 . Girdling also decreased soil CO2 efflux. These results confirmed that root respiration contributes to xylem CO2 transport and that failure to account for this flux results in inaccurate estimates of belowground respiration when efflux-based methods are used. This research adds to the growing body of evidence that efflux-based measurements of belowground respiration underestimate autotrophic contributions.</div></front></TEI><affiliations><list><country><li>Belgique</li></country><region><li>Province de Flandre-Orientale</li><li>Région flamande</li></region><settlement><li>Gand</li></settlement><orgName><li>Université de Gand</li></orgName></list><tree><noCountry><name sortKey="Agneessens, Laura" sort="Agneessens, Laura" uniqKey="Agneessens L" first="Laura" last="Agneessens">Laura Agneessens</name><name sortKey="Aubrey, Doug P" sort="Aubrey, Doug P" uniqKey="Aubrey D" first="Doug P" last="Aubrey">Doug P. Aubrey</name><name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O" last="Teskey">Robert O. Teskey</name><name sortKey="Van Meulebroek, Lieven" sort="Van Meulebroek, Lieven" uniqKey="Van Meulebroek L" first="Lieven" last="Van Meulebroek">Lieven Van Meulebroek</name></noCountry><country name="Belgique"><region name="Région flamande"><name sortKey="Bloemen, Jasper" sort="Bloemen, Jasper" uniqKey="Bloemen J" first="Jasper" last="Bloemen">Jasper Bloemen</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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