Instantaneous stomatal optimization results in suboptimal carbon gain due to legacy effects
Instantaneous stomatal optimization results in suboptimal carbon gain due to legacy effects
复制标题
由于遗留效应，瞬时气孔优化导致碳增益不理想
DOI：
10.1111/pce.14427
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Vico, Giulia
中科院分区：
文献类型：
--
作者：
Feng, Xue;Lu, Yaojie;Jiang, Mingkai;Katul, Gabriel;Manzoni, Stefano;Mrad, Assaad;Vico, Giulia
几十年来，气孔优化一直是代表植物气孔21调节的一种常见的现象学方法。最近的研究最大限度地增加了瞬时净碳增益，复制了22个与快速环境刺激有关的气孔导度的经验变化，例如23个光合作用有效辐射和水汽压差。然而，这种瞬时气孔24优化框架缺乏解释与植物25环境反馈相关的“遗留效应”的能力。这里，比较了考虑和不考虑这些遗留效应的两个气孔优化模型的解。比较的重点是气孔导度、27蒸腾速率、净碳增益率和在28种不同降雨条件下以及在有无竞争的情况下随时间的永久木质部损伤。结果表明，由瞬时气孔优化得到的最佳解决方案29在大多数情况30中生产率显著降低，并且当木质部栓塞不能完全修复时是不可行的。考虑到遗传效应提高了植物的生产力，因此对于理解基于32最优原理的气孔调节是必不可少的。这些模型比较表明，遗留效应对形成33个植被对气候和环境变化的适应和适应反应是重要的，因此在未来的气孔优化方案中必须解决34个问题。35
Stomatal optimization has been a common phenomenological approach to represent plant stomatal 21 regulation for decades. Recent studies that maximize the instantaneous net carbon gain reproduce 22 empirical stomatal conductance variations in relation to fast environmental stimuli such as 23 photosynthetically active radiation and vapor pressure deficit. However, this instantaneous stomatal 24 optimization framework lacks the ability to account for ‘legacy effects’ associated with plant-25 environment feedbacks. Here, the solutions of two stomatal optimization models that do and do not 26 account for these legacy effects are compared. The comparisons focus on stomatal conductance, 27 transpiration rates, net carbon gain rates, and permanent xylem damage over time under different 28 rainfall regimes and in the presence and absence of competition. It is shown that the optimal solution 29 resulting from the instantaneous stomatal optimization is significantly less productive in most scenarios 30 and not viable when xylem embolism cannot be fully repaired. Accounting for legacy effects improves 31 plant productivity and therefore is essential to understanding stomatal regulation based on the 32 optimality principle. These model comparisons demonstrate that legacy effects are significant to shape 33 vegetation acclimation and adaptation responses to climate and environmental change, and thus must 34 be resolved in future stomatal optimization schemes. 35