A stomatal control model based on optimization of carbon gain versus hydraulic risk predicts aspen sapling responses to drought

The New Phytologist
Martin D VenturasWilliam R L Anderegg

Abstract

Empirical models of plant drought responses rely on parameters that are difficult to specify a priori. We test a trait- and process-based model to predict environmental responses from an optimization of carbon gain vs hydraulic risk. We applied four drought treatments to aspen (Populus tremuloides) saplings in a research garden. First we tested the optimization algorithm by using predawn xylem pressure as an input. We then tested the full model which calculates root-zone water budget and xylem pressure hourly throughout the growing season. The optimization algorithm performed well when run from measured predawn pressures. The per cent mean absolute error (MAE) averaged 27.7% for midday xylem pressure, transpiration, net assimilation, leaf temperature, sapflow, diffusive conductance and soil-canopy hydraulic conductance. Average MAE was 31.2% for the same observations when the full model was run from irrigation and rain data. Saplings that died were projected to exceed 85% loss in soil-canopy hydraulic conductance, whereas surviving plants never reached this threshold. The model fit was equivalent to that of an empirical model, but with the advantage that all inputs are specific traits. Prediction is empowered because knowing th...Continue Reading

References

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Dec 15, 2011·Proceedings of the National Academy of Sciences of the United States of America·William R L AndereggChristopher B Field
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Citations

Jul 28, 2019·The New Phytologist·Saverio PerriAnnalisa Molini
Nov 5, 2019·The Plant Journal : for Cell and Molecular Biology·Dongliang Xiong, Miquel Nadal
Nov 27, 2019·Proceedings of the National Academy of Sciences of the United States of America·John S SperryXiaonan Tai
Dec 17, 2019·The New Phytologist·Manon E B SabotGab Abramowitz
Sep 5, 2019·Global Change Biology·Jin WuAlistair Rogers
Feb 18, 2020·The New Phytologist·Charlotte GrossiordNate G McDowell
Apr 8, 2020·The New Phytologist·William R L Anderegg, Martin D Venturas
Apr 6, 2020·The New Phytologist·Yujie WangAnna T Trugman
Jun 9, 2020·Global Change Biology·Martin G De KauwePeter R Briggs
Aug 28, 2019·The New Phytologist
Sep 24, 2019·The New Phytologist·Nate G McDowellAndrea Nardini
May 16, 2020·Frontiers in Plant Science·Phillip PapastefanouAnja Rammig
May 28, 2020·Frontiers in Plant Science·Nicole ZenesWilliam R L Anderegg
Jun 27, 2019·Proceedings of the National Academy of Sciences of the United States of America·William R L AndereggSamuel E Tuttle
Dec 20, 2019·The New Phytologist·Andrew KulmatiskiAnna T Trugman
Sep 28, 2020·The New Phytologist·Lucy RowlandMaurizio Mencuccini
Feb 13, 2021·The New Phytologist·Yujie WangChristian Frankenberg
Jun 17, 2021·The New Phytologist·Sandy P HarrisonIan J Wright
Jun 9, 2021·The New Phytologist·Martin G De KauweDavid T Tissue
Sep 3, 2019·The Science of the Total Environment·Pengcheng SunShuguang Liu

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