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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1111/nph.13979
|2 doi
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|a pubmed24n0867.xml
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|a eng
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|a West, Adam G
|e verfasserin
|4 aut
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|a Experimental evidence for heat plume-induced cavitation and xylem deformation as a mechanism of rapid post-fire tree mortality
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 30.01.2018
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2016 The Authors. New Phytologist © 2016 New Phytologist Trust.
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|a Recent work suggests that hydraulic mechanisms, rather than cambium necrosis, may account for rapid post-fire tree mortality. We experimentally tested for xylem cavitation, as a result of exposure to high-vapour-deficit (D) heat plumes, and permanent xylem deformation, as a result of thermal softening of lignin, in two tree species differing in fire tolerance. We measured percentage loss of conductance (PLC) in distal branches that had been exposed to high-D heat plumes or immersed in hot water baths (high temperature, but not D). Results were compared with predictions from a parameterized hydraulic model. Physical damage to the xylem was examined microscopically. Both species suffered c. 80% PLC when exposed to a 100°C plume. However, at 70°C, the fire-sensitive Kiggelaria africana suffered lower PLC (49%) than the fire-resistant Eucalytpus cladocalyx (80%). Model simulations suggested that differences in PLC between species were a result of greater hydraulic segmentation in E. cladocalyx. Kiggelaria africana suffered considerable PLC (59%), as a result of heat-induced xylem deformation, in the water bath treatments, but E. cladocalyx did not. We suggest that a suite of 'pyrohydraulic' traits, including hydraulic segmentation and heat sensitivity of the xylem, may help to explain why some tree species experience rapid post-fire mortality after low-intensity fires and others do not
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Eucalyptus cladocalyx
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|a Kiggelaria africana
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|a cavitation
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|a fire
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|a hydraulic failure
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|a pyrohydraulics
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|a tree mortality
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|a xylem deformation
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| 700 |
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|a Nel, Jacques A
|e verfasserin
|4 aut
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|a Bond, William J
|e verfasserin
|4 aut
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| 700 |
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|a Midgley, Jeremy J
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 211(2016), 3 vom: 14. Aug., Seite 828-38
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|x 1469-8137
|7 nnns
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|g volume:211
|g year:2016
|g number:3
|g day:14
|g month:08
|g pages:828-38
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|u http://dx.doi.org/10.1111/nph.13979
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