Development and verification of a water and sugar transport model using measured stem diameter variations
Identifieur interne : 000603 ( Main/Exploration ); précédent : 000602; suivant : 000604Development and verification of a water and sugar transport model using measured stem diameter variations
Auteurs : Veerle De Schepper [Belgique] ; Kathy Steppe [Belgique]Source :
- Journal of experimental botany [ 0022-0957 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Sucre.
English descriptors
- KwdEn :
Abstract
In trees, water and sugars are transported by xylem and phloem conduits which are hydraulically linked. A simultaneous study of both flows is interesting, since they concurrently influence important processes such as stomatal regulation and growth. A few mathematical models have already been developed to investigate the influence of both hydraulically coupled flows. However, none of these models has so far been tested using real measured field data. In the present study, a comprehensive whole-tree model is developed that enables simulation of the stem diameter variations driven by both the water and sugar transport. Stem diameter variations are calculated as volume changes of both the xylem and the phloem tissue. These volume changes are dependent on: (i) water transport according to the cohesion-tension theory; (ii) sugar transport according to the Münch hypothesis; (iii) loading and unloading of sugars; and (iv) irreversible turgor-driven growth. The model considers three main compartments (crown, stem, and roots) and is verified by comparison with actual measured stem diameter variations and xylem sap flow rates. These measurements were performed on a young oak (Quercus robur L.) tree in controlled conditions and on an adult beech (Fagus sylvatica L.) tree in a natural forest. A good agreement was found between simulated and measured data. Hence, the model seemed to be a realistic representation of the processes observed in reality. Furthermore, the model is able to simulate several physiological variables which are relatively difficult to measure: phloem turgor, phloem osmotic pressure, and Münch's counterflow. Simulation of these variables revealed daily dynamics in their behaviour which were mainly induced by transpiration. Some of these dynamics are experimentally confirmed in the literature, while others are not.
Affiliations:
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Steppe</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653</s1><s2>9000 Ghent</s2><s3>BEL</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Belgique</country><placeName><region type="province" nuts="2">Province de Flandre-Orientale</region><settlement type="city">Gand</settlement></placeName><orgName type="university">Université de Gand</orgName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">10-0286586</idno><date when="2010">2010</date><idno type="stanalyst">PASCAL 10-0286586 INIST</idno><idno type="RBID">Pascal:10-0286586</idno><idno type="wicri:Area/PascalFrancis/Corpus">000044</idno><idno type="wicri:Area/PascalFrancis/Curation">00089</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000043</idno><idno type="wicri:explorRef" 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type="province" nuts="2">Province de Flandre-Orientale</region><settlement type="city">Gand</settlement></placeName><orgName type="university">Université de Gand</orgName></affiliation></author><author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653</s1><s2>9000 Ghent</s2><s3>BEL</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Belgique</country><placeName><region type="province" nuts="2">Province de Flandre-Orientale</region><settlement type="city">Gand</settlement></placeName><orgName type="university">Université de Gand</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of experimental botany</title><title level="j" type="abbreviated">J. exp. bot.</title><idno type="ISSN">0022-0957</idno><imprint><date when="2010">2010</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of experimental botany</title><title level="j" type="abbreviated">J. exp. bot.</title><idno type="ISSN">0022-0957</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Development</term><term>Diameter</term><term>Fagus sylvatica</term><term>Growth</term><term>Internal flow</term><term>Measurement method</term><term>Modeling</term><term>Phloem</term><term>Quercus robur</term><term>Sap</term><term>Stem</term><term>Sugar</term><term>Translocation</term><term>Transport</term><term>Xylem</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Développement</term><term>Sucre</term><term>Transport</term><term>Modélisation</term><term>Méthode mesure</term><term>Tige</term><term>Diamètre</term><term>Croissance</term><term>Phloème</term><term>Fagus sylvatica</term><term>Quercus robur</term><term>Sève</term><term>Translocation</term><term>Ecoulement interne</term><term>Xylème</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Sucre</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In trees, water and sugars are transported by xylem and phloem conduits which are hydraulically linked. A simultaneous study of both flows is interesting, since they concurrently influence important processes such as stomatal regulation and growth. A few mathematical models have already been developed to investigate the influence of both hydraulically coupled flows. However, none of these models has so far been tested using real measured field data. In the present study, a comprehensive whole-tree model is developed that enables simulation of the stem diameter variations driven by both the water and sugar transport. Stem diameter variations are calculated as volume changes of both the xylem and the phloem tissue. These volume changes are dependent on: (i) water transport according to the cohesion-tension theory; (ii) sugar transport according to the Münch hypothesis; (iii) loading and unloading of sugars; and (iv) irreversible turgor-driven growth. The model considers three main compartments (crown, stem, and roots) and is verified by comparison with actual measured stem diameter variations and xylem sap flow rates. These measurements were performed on a young oak (Quercus robur L.) tree in controlled conditions and on an adult beech (Fagus sylvatica L.) tree in a natural forest. A good agreement was found between simulated and measured data. Hence, the model seemed to be a realistic representation of the processes observed in reality. Furthermore, the model is able to simulate several physiological variables which are relatively difficult to measure: phloem turgor, phloem osmotic pressure, and Münch's counterflow. Simulation of these variables revealed daily dynamics in their behaviour which were mainly induced by transpiration. Some of these dynamics are experimentally confirmed in the literature, while others are not.</div></front></TEI><affiliations><list><country><li>Belgique</li></country><region><li>Province de Flandre-Orientale</li></region><settlement><li>Gand</li></settlement><orgName><li>Université de Gand</li></orgName></list><tree><country name="Belgique"><region name="Province de Flandre-Orientale"><name sortKey="De Schepper, Veerle" sort="De Schepper, Veerle" uniqKey="De Schepper V" first="Veerle" last="De Schepper">Veerle De Schepper</name></region><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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