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Rainfall drives variation in rates of change in intrinsic water use efficiency of tropical forests
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Journal Article
Rainfall drives variation in rates of change in intrinsic water use efficiency of tropical forests
2019
Overview
Rates of change in intrinsic water use efficiency (
W
) of trees relative to those in atmospheric [CO
2
] (
c
a
) have been mostly assessed via short-term studies (e.g., leaf analysis, flux analysis) and/or step increases in
c
a
(e.g., FACE studies). Here we use compiled data for abundances of carbon isotopes in tree stems to show that on decadal scales, rates of change (
dW/dc
a
) vary with location and rainfall within the global tropics. For the period 1915–1995, and including corrections for mesophyll conductance and photorespiration,
dW/dc
a
for drier tropical forests (receiving ~ 1000 mm rainfall) were at least twice that of the wettest (receiving ~ 4000 mm). The data also empirically confirm theorized roles of tropical forests in changes in atmospheric
13
C/
12
C ratios (the
13
C Suess Effect). Further formal analysis of geographic variation in decade-to-century scale
dW/dc
a
will be needed to refine current models that predict increases in carbon uptake by forests without hydrological cost.
How the water use efficiency of trees changes with atmospheric CO
2
variations has mostly been studied on short time scales. Here, a newly compiled data set covering 1915 to 1995 shows how rates of change in water use efficiency vary with location and rainfall over the global tropics on a decadal scale.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
