The response of stomatal conductance to seasonal drought in tropical forests

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

doi:10.1111/gcb.14820

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

Journal Article · 03 September 2019 · Global Change Biology

DOI: https://doi.org/10.1111/gcb.14820 · OSTI ID:1558236

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Brookhaven National Lab. (BNL), Upton, NY (United States). Biological, Environmental & Climate Sciences Dept.; Univ. of Hong Kong (China). School of Biological Sciences
Brookhaven National Lab. (BNL), Upton, NY (United States). Biological, Environmental & Climate Sciences Dept.
Smithsonian Tropical Research Inst., Apartado (Panama)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Earth and Environmental Sciences Division
Smithsonian Tropical Research Institute Apartado Panama; Ecology and Evolutionary Biology Department Princeton University Princeton NJ USA

Stomata regulate CO₂ uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (g_s) 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 leaf water potential (Ψ_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 (V_c,_max), leaf water content, the degree of isohydry, and predawn Ψ_leaf. We first investigated how the choice of four commonly used leaf-level gs models with and without the inclusion of Ψ_leaf as an additional predictor variable influence the ability to predict g_s, 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 Ψ_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 g_s 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:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: SC0012704

OSTI ID:: 1558236

Report Number(s):: BNL-212003-2019-JAAM

Journal Information:: Global Change Biology, Journal Name: Global Change Biology Journal Issue: none Vol. none; ISSN 1354-1013

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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