Field measurements of ultrasonic acoustic emissions and stem diameter variations. New insight into the relationship between xylem tensions and embolism

Teemu Hölttä, Timo Vesala, Eero Nikinmaa, Martti Perämäki, Erkki Siivola, M Mencuccini

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

We examined interrelated xylem water tensions and embolism dynamics under field conditions by simultaneously monitoring ultra-acoustic emissions and changes in stem xylem diameter. Variation in stem xylem diameter was measured with linear displacement transducers to estimate variation in sap tension. Measured ultrasonic acoustic emissions coincided well with changes in xylem diameter, indicating that individual peaks in embolism occurred simultaneously with peaks in water tension. The good time resolution between measurements makes this method especially suitable for observing embolism dynamics on a short timescale. Longer lasting measurements can also be made to monitor inter-daily patterns in water tension and embolism because the techniques are non-destructive. Ultra-acoustic emissions occurred mainly during periods of decreasing stem xylem diameter, i.e., increasing water tension, when the water tension was high enough. Embolism also occurred during periods of increasing xylem diameter, i.e., decreasing water tension, but the number of embolizing conduits under these conditions was small.
Originalspråkengelska
TidskriftTree Physiology
Volym25
Utgåva2
Sidor (från-till)237-243
Antal sidor7
ISSN0829-318X
StatusPublicerad - 2005
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 411 Jordbruks- och skogsvetenskaper
  • Pinus sylvestris

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title = "Field measurements of ultrasonic acoustic emissions and stem diameter variations. New insight into the relationship between xylem tensions and embolism",
abstract = "We examined interrelated xylem water tensions and embolism dynamics under field conditions by simultaneously monitoring ultra-acoustic emissions and changes in stem xylem diameter. Variation in stem xylem diameter was measured with linear displacement transducers to estimate variation in sap tension. Measured ultrasonic acoustic emissions coincided well with changes in xylem diameter, indicating that individual peaks in embolism occurred simultaneously with peaks in water tension. The good time resolution between measurements makes this method especially suitable for observing embolism dynamics on a short timescale. Longer lasting measurements can also be made to monitor inter-daily patterns in water tension and embolism because the techniques are non-destructive. Ultra-acoustic emissions occurred mainly during periods of decreasing stem xylem diameter, i.e., increasing water tension, when the water tension was high enough. Embolism also occurred during periods of increasing xylem diameter, i.e., decreasing water tension, but the number of embolizing conduits under these conditions was small.",
keywords = "411 Agriculture and forestry, Pinus sylvestris, Pinus sylvestris, Pinus sylvestris",
author = "Teemu H{\"o}ltt{\"a} and Timo Vesala and Eero Nikinmaa and Martti Per{\"a}m{\"a}ki and Erkki Siivola and M Mencuccini",
year = "2005",
language = "English",
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pages = "237--243",
journal = "Tree Physiology",
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Field measurements of ultrasonic acoustic emissions and stem diameter variations. New insight into the relationship between xylem tensions and embolism. / Hölttä, Teemu; Vesala, Timo; Nikinmaa, Eero; Perämäki, Martti; Siivola, Erkki; Mencuccini, M.

I: Tree Physiology, Vol. 25, Nr. 2, 2005, s. 237-243.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Field measurements of ultrasonic acoustic emissions and stem diameter variations. New insight into the relationship between xylem tensions and embolism

AU - Hölttä, Teemu

AU - Vesala, Timo

AU - Nikinmaa, Eero

AU - Perämäki, Martti

AU - Siivola, Erkki

AU - Mencuccini, M

PY - 2005

Y1 - 2005

N2 - We examined interrelated xylem water tensions and embolism dynamics under field conditions by simultaneously monitoring ultra-acoustic emissions and changes in stem xylem diameter. Variation in stem xylem diameter was measured with linear displacement transducers to estimate variation in sap tension. Measured ultrasonic acoustic emissions coincided well with changes in xylem diameter, indicating that individual peaks in embolism occurred simultaneously with peaks in water tension. The good time resolution between measurements makes this method especially suitable for observing embolism dynamics on a short timescale. Longer lasting measurements can also be made to monitor inter-daily patterns in water tension and embolism because the techniques are non-destructive. Ultra-acoustic emissions occurred mainly during periods of decreasing stem xylem diameter, i.e., increasing water tension, when the water tension was high enough. Embolism also occurred during periods of increasing xylem diameter, i.e., decreasing water tension, but the number of embolizing conduits under these conditions was small.

AB - We examined interrelated xylem water tensions and embolism dynamics under field conditions by simultaneously monitoring ultra-acoustic emissions and changes in stem xylem diameter. Variation in stem xylem diameter was measured with linear displacement transducers to estimate variation in sap tension. Measured ultrasonic acoustic emissions coincided well with changes in xylem diameter, indicating that individual peaks in embolism occurred simultaneously with peaks in water tension. The good time resolution between measurements makes this method especially suitable for observing embolism dynamics on a short timescale. Longer lasting measurements can also be made to monitor inter-daily patterns in water tension and embolism because the techniques are non-destructive. Ultra-acoustic emissions occurred mainly during periods of decreasing stem xylem diameter, i.e., increasing water tension, when the water tension was high enough. Embolism also occurred during periods of increasing xylem diameter, i.e., decreasing water tension, but the number of embolizing conduits under these conditions was small.

KW - 411 Agriculture and forestry

KW - Pinus sylvestris

KW - Pinus sylvestris

KW - Pinus sylvestris

M3 - Article

VL - 25

SP - 237

EP - 243

JO - Tree Physiology

JF - Tree Physiology

SN - 0829-318X

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ER -