The response of stomatal conductance to seasonal drought in tropical forests

Wu, Jin; Serbin, Shawn; Ely, Kim S.; Wolfe, Brett; Dickman, Lee T.; Grossiord, Charlotte; Michaletz, Sean; Collins, Adam D.; Detto, Metteo; McDowell, Nate G.; Wright, Joseph; Rogers, Alistair

doi:10.1111/gcb.14820

Title: The response of stomatal conductance to seasonal drought in tropical forests

Journal Article · Fri Feb 28 00:00:00 EST 2020 · Global Change Biology

DOI:https://doi.org/10.1111/gcb.14820· OSTI ID:1773813

Wu, Jin ^[1]; Serbin, Shawn ^[1]; Ely, Kim S. ^[2]; Wolfe, Brett ^[3]; Dickman, Lee T. ^[4]; Grossiord, Charlotte ^[4]; Michaletz, Sean ^[5]; Collins, Adam D. ^[4]; Detto, Metteo ^[3]; McDowell, Nate G. ^[6]; Wright, Joseph ^[3]; Rogers, Alistair ^[1]

Environmental & Climate Sciences Department, Brookhaven National Laboratory, New York, NY, USA
Environmental & Climate Sciences Department, Brookhaven National Laboratory, Upton, New Yo
Smithsonian Tropical Research Institute
Los Alamos National Laboratory
Los Alamos National Laboratory, New Mexico
BATTELLE (PACIFIC NW LAB)

Stomata regulate CO2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (gs) in models vary. In particular, current understanding of drivers of the variation in a key parameter in those models, the slope parameter (i.e. a measure of intrinsic plant water-use-efficiency), is still limited, particularly in the tropics. Here we collected diurnal measurements of leaf gas exchange and water potential (?leaf), and a suite of plant traits from the upper canopy of 15 tropical trees in two contrasting Panamanian forests throughout the dry season of the 2016 El Niño. The plant traits included wood density, leaf-mass-per-area (LMA), leaf carboxylation capacity (Vc,max25), leaf water content, the degree of isohydry, and predawn ?leaf. We first investigated how the choice of four commonly used leaf-level gs models with and without the inclusion of ?leaf as an additional predictor variable influence the ability to predict gs, and then explored the abiotic (i.e. month, site-month interaction) and biotic (i.e. tree-species-specific characteristics) drivers of slope parameter variation. Our results show that the inclusion of ?leaf did not improve model performance and that the models that represent the response of gs to vapor pressure deficit performed better than corresponding models that respond to relative humidity. Within each gs model, we found large variation in the slope parameter, and this variation was attributable to the biotic driver, rather than abiotic drivers. We further investigated potential relationships between the slope parameter and the six available plant traits mentioned above, and found that only one trait, LMA, had a significant correlation with the slope parameter (R2=0.66, n=15), highlighting a potential path towards improved model parameterization. This study advances understanding of gs dynamics over seasonal drought, and identifies a practical, trait-based approach to improve modeling of carbon and water exchange in tropical forests.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1773813

Report Number(s):: PNNL-SA-147720

Journal Information:: Global Change Biology, Vol. 26, Issue 2

Country of Publication:: United States

Language:: English

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Christoffersen, Bradley O.; Gloor, Manuel; Fauset, Sophie; +14 more

Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics

Journal Article · Mon Nov 25 00:00:00 EST 2019 · Oecologia · OSTI ID:1773813

Grossiord, Charlotte; Christoffersen, Bradley O.; Alonso-Rodriguez, Aura M.; +30 more

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carbon and water exchange
stomatal conductance model
stomatal slope
plant traits
leaf water potential
vulnerability curve
spectroscopy

Title: The response of stomatal conductance to seasonal drought in tropical forests

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