Zweifel, Roman; Zeugin, Fabienne (2008). Ultrasonic acoustic emissions in drought-stressed trees - more than signals from cavitation? New Phytologist, 179(4), pp. 1070-1079. Oxford: Wiley-Blackwell 10.1111/j.1469-8137.2008.02521.x
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Ultrasonic acoustic emission (UAE) in trees is often related to collapsing water columns in the flow path as a result of tensions that are too strong (cavitation). However, in a decibel (dB) range below that associated with cavitation, a close relationship was found between UAE intensities and stem radius changes.
• UAE was continuously recorded on the stems of mature field-grown trees of Scots pine (Pinus sylvestris) and pubescent oak (Quercus pubescens) at a dry inner-Alpine site in Switzerland over two seasons. The averaged 20-Hz records were related to microclimatic conditions in air and soil, sap-flow rates and stem-radius fluctuations de-trended for growth (ΔW).
• Within a low-dB range (27 ± 1 dB), UAE regularly increased and decreased in a diurnal rhythm in parallel with ΔW on cloudy days and at night. These low-dB emissions were interrupted by UAE abruptly switching between the low-dB range and a high-dB range (36 ± 1 dB) on clear, sunny days, corresponding to the widely supported interpretation of UAE as sound from cavitations.
• It is hypothesized that the low-dB signals in drought-stressed trees are caused by respiration and/or cambial growth as these physiological activities are tissue water-content dependent and have been shown to produce courses of CO2 efflux similar to our courses of ΔW and low-dB UAE.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) 08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Vegetation Ecology [discontinued] |
UniBE Contributor: |
Zweifel, Roman Franz |
Subjects: |
500 Science > 570 Life sciences; biology |
ISSN: |
0028-646X |
Publisher: |
Wiley-Blackwell |
Language: |
English |
Submitter: |
Peter Alfred von Ballmoos-Haas |
Date Deposited: |
04 Oct 2013 15:09 |
Last Modified: |
05 Dec 2022 14:21 |
Publisher DOI: |
10.1111/j.1469-8137.2008.02521.x |
Web of Science ID: |
000258266200016 |
BORIS DOI: |
10.7892/boris.30439 |
URI: |
https://boris.unibe.ch/id/eprint/30439 (FactScience: 194449) |
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