Why is plant-growth response to elevated CO2 amplified when water is limiting, but reduced when nitrogen is limiting? A growth-optimisation hypothesis

Functional Plant Biology : FPB
Ross E McMurtrieCraig V M Barton

Abstract

Experimental evidence indicates that the stomatal conductance and nitrogen concentration ([N]) of foliage decline under CO2 enrichment, and that the percentage growth response to elevated CO2 is amplified under water limitation, but reduced under nitrogen limitation. We advance simple explanations for these responses based on an optimisation hypothesis applied to a simple model of the annual carbon-nitrogen-water economy of trees growing at a CO2-enrichment experiment at Oak Ridge, Tennessee, USA. The model is shown to have an optimum for leaf [N], stomatal conductance and leaf area index (LAI), where annual plant productivity is maximised. The optimisation is represented in terms of a trade-off between LAI and stomatal conductance, constrained by water supply, and between LAI and leaf [N], constrained by N supply. At elevated CO2 the optimum shifts to reduced stomatal conductance and leaf [N] and enhanced LAI. The model is applied to years with contrasting rainfall and N uptake. The predicted growth response to elevated CO2 is greatest in a dry, high-N year and is reduced in a wet, low-N year. The underlying physiological explanation for this contrast in the effects of water versus nitrogen limitation is that leaf photosynthes...Continue Reading

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Citations

May 17, 2011·Tree Physiology·Remko A DuursmaRoss E McMurtrie
Aug 27, 2014·Global Change Biology·Matthias SaurerGiles H F Young
Jun 1, 2016·Frontiers in Plant Science·Frank SterckPieter A Zuidema
Oct 4, 2019·Global Change Biology·Alessio CollaltiIain Colin Prentice
Mar 17, 2020·Frontiers in Plant Science·Marko KvakićBruno Ringeval
Apr 3, 2012·The New Phytologist·Harry T Valentine, Annikki Mäkelä
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Nov 23, 2013·The New Phytologist·Simone FatichiChristian Körner
Apr 8, 2015·Global Change Biology·Zhaozhong FengJohan Uddling
Jul 1, 2013·Functional Plant Biology : FPB·Lucas A CernusakS Joseph Wright
Oct 27, 2010·Proceedings of the National Academy of Sciences of the United States of America·Richard J NorbyRoss E McMurtrie
Nov 7, 2012·Journal of Environmental Quality·Petra HolišováOtmar Urban
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Jan 31, 2015·Oecologia·Masha T van der SandeFrank Sterck
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