Testing the plant pneumatic method to estimate xylem embolism resistance in stems of temperate trees

Zhang, Ya, Lamarque, Laurent J, Torres-Ruiz, José M, Schuldt, Bernhard, Karimi, Zohreh, Li, Shan, Qin, De-Wen, Bittencourt, Paulo ORCID: https://orcid.org/0000-0002-1618-9077, Burlett, Régis, Cao, Kun-Fang, Delzon, Sylvain, Oliveira, Rafael, Pereira, Luciano and Jansen, Steven 2018. Testing the plant pneumatic method to estimate xylem embolism resistance in stems of temperate trees. Tree Physiology 38 (7) , pp. 1016-1025. 10.1093/treephys/tpy015

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Abstract

Methods to estimate xylem embolism resistance generally rely on hydraulic measurements, which can be far from straightforward. Recently, a pneumatic method based on air flow measurements of terminal branch ends was proposed to construct vulnerability curves by linking the amount of air extracted from a branch with the degree of embolism. We applied this novel technique for 10 temperate tree species, including six diffuse, two ring-porous and two gymnosperm species, and compared the pneumatic curves with hydraulic ones obtained from either the flow-centrifuge or the hydraulic-bench dehydration method. We found that the pneumatic method provides a good estimate of the degree of xylem embolism for all angiosperm species. The xylem pressure at 50% and 88% loss of hydraulic conductivity (i.e., Ψ50 and Ψ88) based on the methods applied showed a strongly significant correlation for all eight angiosperms. However, the pneumatic method showed significantly reduced Ψ50 values for the two conifers. Our findings suggest that the pneumatic method could provide a fast and accurate approach for angiosperms due to its convenience and feasibility, at least within the range of embolism resistances covered by our samples.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	Oxford University Press
ISSN:	1758-4469
Date of Acceptance:	31 January 2018
Last Modified:	29 Oct 2024 09:57
URI:	https://orca.cardiff.ac.uk/id/eprint/172725

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