| Ultrasonic acoustic emissions in drought-stressed trees--more than signals from cavitation? | |
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MedLine Citation:
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PMID: 18540974 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 detrended for growth (Delta W). Within a low-dB range (27 +/- 1 dB), UAE regularly increased and decreased in a diurnal rhythm in parallel with DeltaW 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 CO(2) efflux similar to our courses of Delta W and low-dB UAE. |
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Authors:
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R Zweifel; F Zeugin |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-06-06 |
Journal Detail:
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Title: The New phytologist Volume: 179 ISSN: 1469-8137 ISO Abbreviation: New Phytol. Publication Date: 2008 |
Date Detail:
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Created Date: 2008-09-18 Completed Date: 2008-11-18 Revised Date: 2009-12-02 |
Medline Journal Info:
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Nlm Unique ID: 9882884 Medline TA: New Phytol Country: England |
Other Details:
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Languages: eng Pagination: 1070-9 Citation Subset: IM |
Affiliation:
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Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland. roman.zweifel@natkon.ch |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biological Transport Biomechanics Circadian Rhythm Dehydration Pinus sylvestris / metabolism, physiology Quercus / metabolism, physiology Trees / metabolism, physiology* Ultrasonics* Water / metabolism Xylem / metabolism, physiology |
| Chemical | |
Reg. No./Substance:
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7732-18-5/Water |
| Comments/Corrections | |
Comment In:
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New Phytol. 2009;183(4):928-31
[PMID:
19674330
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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