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Canopy fluorescence emission efficiency (ΦF) in evergreen needleleaf forests exhibits a bimodal diurnal pattern with a midday depression and diurnal hysteresis, which is driven by the relaxation of non-photochemical quenching and potential hydraulic limitations. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

August 28, 2026Agricultural and Forest MeteorologyOpen Access

Multi-scale insights into the diurnal dynamics of far-red solar-induced chlorophyll fluorescence emission efficiency in an evergreen needle forest

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XLXuhui LuBeihang University PYPeiqi YangJiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application OMOnno MullerForschungszentrum Jülich

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Implication

Observational study reveals bimodal diurnal dynamics in chlorophyll fluorescence emission efficiency in an evergreen needle forest, highlighting photoprotective quenching controls on photosynthesis.

Key Points

To investigate the diurnal dynamics and environmental drivers of far-red solar-induced chlorophyll fluorescence emission efficiency by decoupling physiological and structural controls across leaf and canopy scales.
Validated the fluorescence correction vegetation index (FCVI) approach for retrieving canopy fluorescence emission efficiency using Soil Canopy Observation of Photosynthesis and Energy fluxes (SCOPE) simulations.
Combined canopy-scale fluorescence emission efficiency estimates with leaf-scale pulse-amplitude modulation fluorometry (MONI-PAM) observations across an evergreen needleleaf forest during the growing season.
Canopy fluorescence emission efficiency exhibited a bimodal diurnal pattern characterized by early morning and late afternoon peaks with a pronounced midday depression, alongside clear diurnal hysteresis in light-response relationships.
Leaf-level measurements showed that accelerated relaxation of non-photochemical quenching after solar noon enhanced both fluorescence emission efficiency and photosystem II efficiency, likely influenced by morning hydraulic limitations.

Cite This Study

Lu et al. (2026) studied this question.

synapsesocial.com/papers/6a916ea0d15324a1df3aa721 https://doi.org/10.1016/j.agrformet.2026.111440

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Implication

Observational study reveals bimodal diurnal dynamics in chlorophyll fluorescence emission efficiency in an evergreen needle forest, highlighting photoprotective quenching controls on photosynthesis.

Multi-scale insights into the diurnal dynamics of far-red solar-induced chlorophyll fluorescence emission efficiency in an evergreen needle forest

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Key Points

Cite This Study

Multi-scale insights into the diurnal dynamics of far-red solar-induced chlorophyll fluorescence emission efficiency in an evergreen needle forest

Discussion

Member takes

Implication

Key Points

Cite This Study

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