Assessing the agreement between the pneumatic and the flow‐centrifuge method for estimating xylem safety in temperate diffuse‐porous tree species DOI Creative Commons
Sharath Shyamappa Paligi, Roman M. Link, Emilie Isasa

et al.

Plant Biology, Journal Year: 2023, Volume and Issue: 25(7), P. 1171 - 1185

Published: Sept. 13, 2023

The increasing frequency of global change-type droughts has created a need for fast, accurate and widely applicable techniques estimating xylem embolism resistance to improve forecasts future forest changes. We used data from 12 diffuse-porous temperate tree species covering wide range safety compare the pneumatic flow-centrifuge method, two rapid methods constructing vulnerability curves. evaluated agreement between parameters estimated with both sensitivity measurements duration air discharge (AD) measurements. There was close water potentials at 50% discharged (PAD), Pneumatron, loss hydraulic conductivity (PLC), method (mean signed deviation: 0.12 MPa, Pearson correlation: 0.96 after 15 s gas extraction). However, relationship slopes more variable, resulting in lower potential 12% 88% PAD/PLC. not affected by species-specific vessel length distributions. All were sensitive AD time. Overall highest relatively short times, an optimum 16 s. Our results highlight value Pneumatron as easy reliable tool estimate thresholds angiosperms. Further, our study provides set useful metrics methodological comparisons curves terms systematic random deviations, well overall agreement.

Language: Английский

Vapour pressure deficit modulates hydraulic function and structure of tropical rainforests under nonlimiting soil water supply DOI Creative Commons
Oliver Binks, Lucas A. Cernusak, Michael J. Liddell

et al.

New Phytologist, Journal Year: 2023, Volume and Issue: 240(4), P. 1405 - 1420

Published: Sept. 14, 2023

Atmospheric conditions are expected to become warmer and drier in the future, but little is known about how evaporative demand influences forest structure function independently from soil moisture availability, fast-response variables (such as canopy water potential stomatal conductance) may mediate longer-term changes response climate change. We used two tropical rainforest sites with different temperatures vapour pressure deficits (VPD), nonlimiting supply, assess impact of on ecophysiological structure. Common species between allowed us test extent which composition, relative abundance intraspecific variability contributed site-level differences. The highest VPD site had lower midday potentials, conductance (gc ), annual transpiration, stature, biomass, while transpiration rate was less sensitive VPD; it also height-diameter allometry (accounting for 51% difference biomass sites) higher plot-level wood density. Our findings suggest that increases VPD, even absence limitation, influence variables, such potentials gc , potentially leading stature resulting reductions biomass.

Language: Английский

Citations

13

Assessing the agreement between the pneumatic and the flow‐centrifuge method for estimating xylem safety in temperate diffuse‐porous tree species DOI Creative Commons
Sharath Shyamappa Paligi, Roman M. Link, Emilie Isasa

et al.

Plant Biology, Journal Year: 2023, Volume and Issue: 25(7), P. 1171 - 1185

Published: Sept. 13, 2023

The increasing frequency of global change-type droughts has created a need for fast, accurate and widely applicable techniques estimating xylem embolism resistance to improve forecasts future forest changes. We used data from 12 diffuse-porous temperate tree species covering wide range safety compare the pneumatic flow-centrifuge method, two rapid methods constructing vulnerability curves. evaluated agreement between parameters estimated with both sensitivity measurements duration air discharge (AD) measurements. There was close water potentials at 50% discharged (PAD), Pneumatron, loss hydraulic conductivity (PLC), method (mean signed deviation: 0.12 MPa, Pearson correlation: 0.96 after 15 s gas extraction). However, relationship slopes more variable, resulting in lower potential 12% 88% PAD/PLC. not affected by species-specific vessel length distributions. All were sensitive AD time. Overall highest relatively short times, an optimum 16 s. Our results highlight value Pneumatron as easy reliable tool estimate thresholds angiosperms. Further, our study provides set useful metrics methodological comparisons curves terms systematic random deviations, well overall agreement.

Language: Английский

Citations

6