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- Title
Reconciling discrepancies in measurements of vulnerability to xylem embolism with the pneumatic method: A comment on Chen et al. (2021) 'Quantifying vulnerability to embolism in tropical trees and lianas using five methods: can discrepancies be explained by xylem structural traits?'
- Authors
Brum, Mauro; Pereira, Luciano; Ribeiro, Rafael Vasconcelos; Jansen, Steven; Bittencourt, Paulo R. L.; Oliveira, Rafael S.; Saleska, Scott R.
- Abstract
Reconciling discrepancies in measurements of vulnerability to xylem embolism with the pneumatic method: A comment on Chen et al. (2021) 'Quantifying vulnerability to embolism in tropical trees and lianas using five methods: can discrepancies be explained by xylem structural traits? They argue that the pneumatic method, which quantifies the relative increasing volume of air discharged from embolized regions of a branch's xylem (relative to a maximum amount of air discharged, AD SB max sb ) as the branch is dehydrated in the laboratory, underestimates I P i SB 50 sb and therefore xylem embolism resistance. By contrast, when Chen I et al i . used nonpneumatic methods, they estimated the embolism resistance using the maximum amount of embolized vessels taken at more negative xylem water potentials (frequently more negative than -6.5 MPa). When we refitted the embolism vulnerability curves scaled by AD SB max sb values that were successively less than the best estimate AD SB max.ref sb , the correspondingly estimated I P i SB 50 sb values were systematically lower in magnitude, on average, than the best estimate ( I P i SB 50.ref sb ), as seen for each of the nine species (Figs 2, S3).
- Subjects
XYLEM; EMBOLISMS; WOOD density; LIANAS; HYDRAULIC measurements
- Publication
New Phytologist, 2023, Vol 237, Issue 2, p374
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.18531