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\begin{document}

\title{Evapotranspiration partitioning based on leaf and ecosystem water use
efficiency}



\author[1]{Liuyang Yu}%
\author[2]{Sha Zhou}%
\author[1]{Xiaodong Gao}%
\author[1]{Xining Zhao}%
\author[3]{Lei Cheng}%
\author[4]{Kadambot H M Siddique}%
\affil[1]{Northwest A\&F University}%
\affil[2]{Columbia University}%
\affil[3]{Wuhan Univ}%
\affil[4]{The University of Western Australia}%


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  \date{June 14, 2024}


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\begin{abstract}
Partitioning evapotranspiration (ET) into evaporation (E) and
transpiration (T) is essential for understanding the global hydrological
cycle and improving water resource management. However, ET partitioning
in various ecosystems is challenging as some assumptions are restricted
to certain areas or plant types. Here, we developed a novel ET
partitioning method coupling definitions of leaf and ecosystem water use
efficiencies (WUEleaf and WUEeco, respectively). We used 25 eddy
covariance flux sites for 196 site-years to evaluate T:ET
characteristics of seven plant functional types (PFTs) at different
spatiotemporal scales. The results indicated the spatiotemporal
characteristics of WUEleaf and WUEeco were not consistent, resulting in
T:ET variation in the seven PFTs. Deciduous broadleaf forests had the
highest mean annual T:ET (0.67), followed by evergreen broadleaf forests
(0.63), grasslands (0.52), evergreen needleleaf forests (0.46), and
woody savanna (0.41), and C3 croplands had higher T:ET (0.65) than C4
croplands (0.48). The annual mean leaf area index (LAI) explained about
26\% of the variation in T:ET, with the trend in T:ET consistent with
the known effects of LAI. The overall trends and magnitude of T:ET in
this study were similar to different results of ET partitioning methods
globally. Importantly, this method improved T:ET estimation accuracy in
vegetation-sparse and water-limited areas. Our novel ET partitioning
method is suitable for estimating T:ET at various spatiotemporal scales
and provides insight into the conversion of WUE at different scales.%
\end{abstract}%



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\textbf{Hosted file}

\verb`essoar.10505202.1.docx`  available at \url{https://authorea.com/users/545043/articles/601902-evapotranspiration-partitioning-based-on-leaf-and-ecosystem-water-use-efficiency}

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