气孔、叶肉和生化限制如何共同限制光合作用：一个双层优化模型

IF 5.7 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 2025-09-13 DOI:10.1016/j.agrformet.2025.110829

Rui Zhu , Tiesong Hu , Giulia Vico , Lu Zhang , Rangjian Qiu , Yingping Wang , Yong Li , Yong Liu

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引用次数: 0

摘要

光合作用依赖于气孔、叶肉和生物化学的限制，而这些限制又以复杂的方式对环境作出反应。然而，目前尚不清楚如何定量描述这三种限制之间的相互关系及其对环境变化的反应。我们引入了一个嵌套的（双层）优化建模框架，其中气孔和非气孔限制针对单独的优化目标进行优化。气孔优化是优先考虑的，气孔导度在设定水力成本的情况下最大化光合作用。反过来，对于固定的气孔导度，叶肉导度和生化能力被优化，以最小的成本获得最大的光合作用。我们的模型再现了气孔导度、叶肉导度和生化能力对关键环境因子（光照、空气co2浓度、蒸汽压亏缺和土壤湿度）的响应，包括水分胁迫下气孔导度、叶肉导度和生化能力的不同但协调的降低。至关重要的是，该模型正确地估计了内在水分利用效率的变化，并提供了关于植物水力和光合特性变化如何驱动光合限制动态的可测试预测。我们的工作为理解和预测叶肉和生化限制如何与气孔调节协调提供了一个新的优化框架，为进一步的理论和实验研究提供了便利。

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How stomatal, mesophyll, and biochemical limitations co-limit photosynthesis: A bilevel optimization model

Photosynthesis depends on stomatal, mesophyll, and biochemical limitations, which in turn respond to the environment in complex ways. However, it remains unclear how to quantitatively describe the interrelationships among these three limitations and their response to environmental changes.

We introduce a nested (bilevel) optimization modeling framework in which stomatal and non-stomatal limitations are optimized for separate optimization objectives. Stomatal optimization is prioritized, with stomatal conductance maximizing photosynthesis for set hydraulic costs. In turn, for set stomatal conductance, mesophyll conductance and biochemical capacity are optimized for maximum photosynthesis at a minimal cost.

Our model reproduced observed responses of stomatal conductance, mesophyll conductance, and biochemical capacity to key environmental factors (light, air

C O_{2}

concentration, vapor pressure deficit, and soil moisture), including the different but coordinated reductions in stomatal conductance, mesophyll conductance, and biochemical capacity under water stress. Crucially, the model correctly estimated changes in intrinsic water use efficiency and provided testable predictions about how variations in plant hydraulic and photosynthetic traits drive the dynamic of photosynthetic limitations.

Our work provides a novel optimization framework for understanding and predicting how mesophyll and biochemical limitations are coordinated with stomatal regulation, which facilitates further theoretical and experimental studies.

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来源期刊

Agricultural and Forest Meteorology 农林科学-林学

CiteScore

10.30

自引率

9.70%

发文量

415

审稿时长

69 days

期刊介绍： Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.