Diminishing CO2-driven gains in water-use efficiency of global forests

Mark A. Adams (), Thomas N. Buckley and Tarryn L. Turnbull
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Mark A. Adams: Swinburne University of Technology
Thomas N. Buckley: University of California, Davis
Tarryn L. Turnbull: Swinburne University of Technology

Nature Climate Change, 2020, vol. 10, issue 5, 466-471

Abstract: Abstract There is broad consensus that, via changes in stomatal conductance, plants moderate the exchanges of water and carbon between the biosphere and atmosphere, playing a major role in global hydroclimate. Tree rings record atmospheric CO2 concentration (ca) and its isotopic composition (13C/12C)—mediated by stomatal and photosynthetic influences—that can be expressed in terms of intrinsic water-use efficiency (W). Here, we compile a global W dataset based on 422 tree-ring isotope series and report that W increased with ca over the twentieth century, but the rates of increase (dW/dca) declined by half. Angiosperms contributed more than gymnosperms to the slowdown, and in recent decades, dW/dca for angiosperms was close to zero. dW/dca varies widely across climatic regions and reflects pauses in emissions during the Great Depression and after World War II. There is strong spatial variability in climate forcing via an increasing W, which is weakening globally with time.

Date: 2020
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DOI: 10.1038/s41558-020-0747-7

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