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Propagating ice front induces gas bursts and ultrasonic acoustic emissions from freezing xylem.

Identifieur interne : 000111 ( Main/Exploration ); précédent : 000110; suivant : 000112

Propagating ice front induces gas bursts and ultrasonic acoustic emissions from freezing xylem.

Auteurs : Anna Lintunen [Finlande] ; Adriano Losso [Autriche] ; Juho Aalto [Finlande] ; Tommy Chan [Finlande] ; Teemu Höltt [Finlande] ; Stefan Mayr [Autriche]

Source :

RBID : pubmed:31860711

Descripteurs français

English descriptors

Abstract

Ice formation and propagation in the xylem of plants is a complex process. During freezing of xylem sap, gases dissolved in liquid sap are forced out of the ice lattice due to their low solubility in ice, and supersaturation of xylem sap as well as low water potential (Ѱ) are induced at the ice-liquid interface. Supersaturation of gases near the ice front may lead to bubble formation and potentially to cavitation and/or to burst of gases driven out from the branch. In this study, we investigated the origin and dynamics of freezing-related gas bursts and ultrasonic acoustic emissions (AEs), which are suggested to indicate cavitation. Picea abies (L.) H. Karst. and Salix caprea L. branch segments were exposed to frost cycles in a temperature test chamber, and CO2 efflux (indicating gas bursts) and AEs were recorded. On freezing, two-thirds of the observed gas bursts originated from the xylem and only one-third from the bark. Simultaneously with gas bursts, AEs were detected. Branch Ѱ affected both gas bursts and AEs, with high gas burst in saturated and dry samples but relevant AEs only in the latter. Repeated frost cycles led to decreasing gas burst volumes and AE activity. Experiments revealed that the expanding ice front in freezing xylem was responsible for observed gas bursts and AEs, and that branch Ѱ influenced both processes. Results also indicated that gas bursts and cavitation are independently induced by ice formation, though both may be relevant for bubble dynamics during freezing.

DOI: 10.1093/treephys/tpz123
PubMed: 31860711


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Ice formation and propagation in the xylem of plants is a complex process. During freezing of xylem sap, gases dissolved in liquid sap are forced out of the ice lattice due to their low solubility in ice, and supersaturation of xylem sap as well as low water potential (Ѱ) are induced at the ice-liquid interface. Supersaturation of gases near the ice front may lead to bubble formation and potentially to cavitation and/or to burst of gases driven out from the branch. In this study, we investigated the origin and dynamics of freezing-related gas bursts and ultrasonic acoustic emissions (AEs), which are suggested to indicate cavitation. Picea abies (L.) H. Karst. and Salix caprea L. branch segments were exposed to frost cycles in a temperature test chamber, and CO2 efflux (indicating gas bursts) and AEs were recorded. On freezing, two-thirds of the observed gas bursts originated from the xylem and only one-third from the bark. Simultaneously with gas bursts, AEs were detected. Branch Ѱ affected both gas bursts and AEs, with high gas burst in saturated and dry samples but relevant AEs only in the latter. Repeated frost cycles led to decreasing gas burst volumes and AE activity. Experiments revealed that the expanding ice front in freezing xylem was responsible for observed gas bursts and AEs, and that branch Ѱ influenced both processes. Results also indicated that gas bursts and cavitation are independently induced by ice formation, though both may be relevant for bubble dynamics during freezing.</div>
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<name sortKey="Lintunen, Anna" sort="Lintunen, Anna" uniqKey="Lintunen A" first="Anna" last="Lintunen">Anna Lintunen</name>
</country>
<country name="Autriche">
<noRegion>
<name sortKey="Losso, Adriano" sort="Losso, Adriano" uniqKey="Losso A" first="Adriano" last="Losso">Adriano Losso</name>
</noRegion>
<name sortKey="Mayr, Stefan" sort="Mayr, Stefan" uniqKey="Mayr S" first="Stefan" last="Mayr">Stefan Mayr</name>
</country>
</tree>
</affiliations>
</record>

Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Bois/explor/WillowV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000111 | SxmlIndent | more

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Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Bois
   |area=    WillowV1
   |flux=    Main
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   |clé=     pubmed:31860711
   |texte=   Propagating ice front induces gas bursts and ultrasonic acoustic emissions from freezing xylem.
}}

Pour générer des pages wiki

HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Exploration/RBID.i   -Sk "pubmed:31860711" \
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       | NlmPubMed2Wicri -a WillowV1 

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Data generation: Tue Nov 17 16:35:40 2020. Site generation: Tue Nov 17 16:39:32 2020