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The role of stomatal acclimation in modelling tree adaptation to high CO2

机译：气孔驯化在高CO 2 树适应性建模中的作用

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Carbon dioxide enrichment changes the balance of photosynthetic limitations due to water, nitrogen, and light. This paper examines the role of stomata in these changes by comparing enrichment responses predicted by an optimality-based tree growth model, DESPOT, using three alternative ‘setpoints’ for stomatal acclimation: leaf water potential (ψl-setpoint), the ratio of intercellular to ambient CO2 mole fraction (ci/ca-setpoint), and the parameters in a simple model in which stomata are controlled by H2O and CO2 supply and demand (linked feedback). In each scenario, stomatal conductance (gs) and photosynthetic capacity (Vm) declined, productivity and leaf area index (LAI) increased, and ci/ca remained within 5% of its pre-enrichment value. Height growth preceded the LAI response in the ψl-setpoint and linked feedback scenarios, but not in the ci/ca-setpoint scenario. These trends were explained in terms of photosynthetic resource substitution using the equimarginal principle of production theory, which controls carbon allocation in DESPOT: enrichment initially increased the marginal product for light, driving substitution towards light; height growth also drove substitution towards N in the ψl and feedback scenarios, but the inflexibility of ci/ca prevented that substitution in the ci/ca scenario, explaining the lack of height response. Each scenario, however, predicted similar behaviour for ci/ca and carbon and water flux. These results suggest that ‘setpoints’ may be robust tools for linking and constraining carbon and water fluxes, but that they should be used more cautiously in predicting or interpreting how those fluxes arise from changes in tree structure and physiology.
机译：由于水，氮和光，二氧化碳的富集改变了光合作用限制的平衡。本文通过比较基于最优的树木生长模型DESPOT预测的富集响应来研究气孔在这些变化中的作用，使用三种替代的“设定点”进行气孔驯化：叶水势（ψ l -设定值），细胞间与环境CO 2 摩尔分数之比（c i / c a 设定值）以及简单的参数气孔由H 2 O和CO 2 供需控制的模型（链接反馈）。在每种情况下，气孔导度（g s ）和光合能力（V m ）下降，生产力和叶面积指数（LAI）增加，c i < / sub> / c a 保持在其富集前值的5％以内。在ψ l 设定点和链接反馈场景中，身高增长先于LAI响应，而在c i / c a 设定点场景中则不高。这些趋势用生产理论的等边际原理通过光合作用资源替代进行了解释，该原理控制了DESPOT中的碳分配：富集最初增加了光的边际产量，推动了光的替代。在ψ l 和反馈场景中，身高的增长也驱使N向替代，但是c i / c a 的僵化阻止了替代c i / c a 场景，解释了缺乏高度响应的情况。但是，每种情况都预测了c i / c a 以及碳和水通量的相似行为。这些结果表明，“设定点”可能是链接和约束碳和水通量的强大工具，但是在预测或解释这些通量如何由树木结构和生理变化产生时，应谨慎使用。

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    《Journal of Experimental Botany》 |2008年第7期|p.1951-1961|共11页
  • 作者

    Thomas N. Buckley123*;

  • 作者单位

    1School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney NSW 2052, Australia 2Bushfire Cooperative Research Centre, Australia 3Ensis, PO Box E4008, Kingston ACT 2604, Australia;

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