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\begin{document}

\title{Canopy height and climate dryness parsimoniously explain spatial
variation of unstressed stomatal conductance}



\author[1]{Yanlan Liu}%
\author[2]{Olivia Flournoy}%
\author[3]{Quan Zhang}%
\author[4]{Kimberly Novick}%
\author[5]{Randal D. Koster}%
\author[2]{Alexandra Konings}%
\affil[1]{The Ohio State University}%
\affil[2]{Stanford University}%
\affil[3]{Wuhan University}%
\affil[4]{Indiana University Bloomington}%
\affil[5]{NASA Goddard SFC}%


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  \date{June 14, 2024}


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\begin{abstract}
The spatio-temporal variation of stomatal conductance directly regulates
photosynthesis, water partitioning, and biosphere-atmosphere
interactions. While many studies have focused on stomatal response to
stresses, the spatial variation of unstressed stomatal conductance
remains poorly determined, and is usually characterized in land surface
models (LSMs) simply based on plant functional type (PFT). Here, we
derived unstressed stomatal conductance at the ecosystem-scale using
observations from 115 global FLUXNET sites. When aggregated by PFTs, the
across-PFT pattern was highly consistent with the parameterizations of
LSMs. However, PFTs alone captured only 17\textbackslash{}\% of the
variation in unstressed stomatal conductance across sites. Within the
same PFT, unstressed stomatal conductance was negatively related to
climate dryness and canopy height, which explained 45\textbackslash{}\%
of the total spatial variation. Our results highlight the importance of
plant-environment interactions in shaping stomatal traits. The
trait-environment relationship established here provides an empirical
approach for improved parameterizations of stomatal conductance in LSMs.%
\end{abstract}%



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