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\begin{document}

\title{Sap flux and stable isotopes of water show contrasting tree water uptake
strategies in two co-occurring tropical rainforest tree species}



\author[1]{Md. Shawkat I. Sohel}%
\author[1]{John Herbohn}%
\author[2]{Jeffrey McDonnell}%
\affil[1]{The University of Queensland School of Agriculture and Food Sciences - St Lucia Campus}%
\affil[2]{University of Saskatchewan Global Institute for Water Security}%


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  \date{May 24, 2024}


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\begin{abstract}
Little~is~known~about~the~short-term~dynamics~of~tree water use
strategies particularly for neighbouring co-occurring species. Here, we
quantify the high frequency changes in water sources and sap flux
patterns of two commonly co-occurring tropical rainforest tree species:
\emph{Dendrocnide photinophylla} (Kunth; Chew) and \emph{Argyrodendron
peralatum} (F.M. Bailey; Edlin ex J.H. Boas). A combination of
continuous sap flux measurements and hourly sampling of xylem water
stable isotope composition (\selectlanguage{greek}δ\selectlanguage{english}Dand \selectlanguage{greek}δ \selectlanguage{english}\textsuperscript{18}O) were used to
observe water use strategies through a 24 h transpiration cycle. Sap
flux ranged from 2.82-28.50 L d \textsuperscript{-1} and was 66.67\%
higher in \emph{A. peralatum} compare to \emph{D. photinophylla.} For
both tree species, sap flux increased with tree size and diurnal sap
flux increase resulted in more isotopically enriched xylem water. A
Bayesian Mixing Model analysis using sampled soil water isotopic
composition from five soil depths from of 0 to 1 m showed that \emph{D.
photinophylla}used very shallow or surface layer (0-20 cm) water, while
\emph{A. peralatum} sourced its water mostly from deeper in the soil
profile (\textgreater{}20 cm). We hypothesize that these differences in
species' water consumption patterns are reated to plant water storage
capacity and, wood anatomical features. Our study shows that combning
xylem isotope composition and sap flux measurements can help reveal
species level water use strategies---useful for improved process
understanding for ecohydrological modeling.%
\end{abstract}%



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\verb`Manuscript_Final.docx`  available at \url{https://authorea.com/users/505623/articles/584656-sap-flux-and-stable-isotopes-of-water-show-contrasting-tree-water-uptake-strategies-in-two-co-occurring-tropical-rainforest-tree-species}

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