Relationships between photochemical reflectance index and light-use efficiency in deciduous and evergreen broadleaf forests

Soudani, Kamel; Hmimina, Gabriel; Dufrêne, Éric; Berveiller, Daniel; Delpierre, Nicolas; Ourcival, Jean‐Marc; Rambal, Serge; Joffre, Richard

doi:10.1016/j.rse.2014.01.017

Cited by 79 publications

(80 citation statements)

References 50 publications

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“…Moreover, there are reports of difficulties with tracking LUE changes in drought-stressed vegetation that may originate from enhancement of respiration processes [74][75][76]. Probably due to interference with respiration we were also unable to distinguish between the effects of low temperature (HI-LT) versus the combined drought and high temperature stress (HI-HT3) using PRI in our dataset ( Figure 7A,B).…”

Section: Evaluation Of Water Limitation From Primentioning

confidence: 86%

“…Separate modelling between sunlit and shaded portions of canopy yielding different Chla+b/Carx+c and PRI was the most efficient way to simulate daily photosynthesis from multi-angular PRI measurements [81]. Contrary to the direct use of PRI, recent pioneering studies employing procedures to estimate ∆PRI from PRI 0 and PRI are leading to attempts to use ∆PRI for the purpose of estimating various stresses [25,75,78]. We also suggest that ability to discern between the two effects of Chla+b/Carx+c and daily dynamics in xanthophylls in PRI 0 should play a crucial role in evaluating ∆PRI.…”

Section: Evaluation Of Water Limitation From Primentioning

confidence: 99%

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Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees

et al. 2018

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Hyperspectral reflectance is becoming more frequently used for measuring the functions and productivity of ecosystems. The purpose of this study was to re-evaluate the potential of the photochemical reflectance index (PRI) for evaluating physiological status of plants. This is needed because the reasons for variation in PRI and its relationships to physiological traits remain poorly understood. We examined the relationships between PRI and photosynthetic parameters in evergreen Norway spruce and deciduous European beech grown in controlled conditions during several consecutive periods of 10-12 days between which the irradiance and air temperature were changed stepwise. These regime changes induced significant changes in foliar biochemistry and physiology. The responses of PRI corresponded particularly to alterations in the actual quantum yield of photosystem II photochemistry (Φ PSII ). Acclimation responses of both species led to loss of PRI sensitivity to light use efficiency (LUE). The procedure of measuring PRI at multiple irradiance-temperature conditions has been designed also for testing accuracy of ∆PRI in estimating LUE. A correction mechanism of subtracting daily measured PRI from early morning PRI has been performed to account for differences in photosynthetic pigments between irradiance-temperature regimes. Introducing ∆PRI, which provided a better estimate of non-photochemical quenching (NPQ) compared to PRI, also improved the accuracy of LUE estimation. Furthermore, ∆PRI was able to detect the effect of drought, which is poorly observable from PRI.

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Section: Evaluation Of Water Limitation From Primentioning

confidence: 86%

Section: Evaluation Of Water Limitation From Primentioning

confidence: 99%

Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees

et al. 2018

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“…Rahimzadeh-Bajgiran et al [13] corrected PRI with a spectral index for chlorophyll content, while Soudani et al [30] corrected for the variation in the intercept of the PRI vs. APAR relationships to improve the multi-year PRI-LUE relationship. However, we would like to stress out that diurnal dynamics in PRI, NPQ, and photoprotection in general remains to be further understood.…”

Section: Discussionmentioning

confidence: 99%

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

et al. 2017

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Abstract:In order to estimate vegetation photosynthesis from remote sensing observations; some critical parameters need to be quantified. From all absorbed light; the plant needs to release any excess that is not used for photosynthesis; by non-photochemical quenching; by fluorescence emission and unregulated thermal dissipation. Non-photochemical quenching (NPQ) processes are controlled photoprotective mechanisms which; once activated; strongly control the dynamics of photochemical efficiency. With illumination conditions increasing and decreasing during a diurnal cycle; photoprotection mechanisms needs to change accordingly. The goal of this work is to quantify dynamic NPQ; measured from active fluorescence measurements; based on passive proximal sensing leaf measurements. During a 22-day controlled light and water stress experiment on a tobacco (Nicotiana tabacum L.) leaf we measured the diurnal dynamics of passive fluorescence (Chl F); the Photochemical Reflectance Index (PRI); the Absorbed Photosynthetically Active Radiation (APAR) and leaf temperature in combination with the actively retrieved non-photochemical quenching (NPQ) parameter. Based on a bi-linear combination of diurnal APAR and PRI (plane fit model) we succeeded to estimate NPQ with a RMSE of 0.08. The simple plane fit model estimation represents well the diurnal NPQ dynamics; except for the high light stress phase; when additional reversible photoinhibition processes took place. The present works presents a way of determining NPQ from passive remote sensing measurements; as a necessary step towards estimating photosynthetic rate.

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“…Importantly, assessments of PRI should be adjusted based on the effects of canopy structure, pigments, view angle and irradiance etc. [52,53,70,77,78], to facilitate its applicability in interpreting photosynthetic activity and in the large-scale monitoring of carbon uptake. Increasingly used unmanned aerial vehicles (UAVs) with various optical sensors provide an exciting opportunity to monitor multiple optical signals (e.g., PRI and WI) with high spatiotemporal resolution [79].…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

Photochemical Reflectance Index (PRI) for Detecting Responses of Diurnal and Seasonal Photosynthetic Activity to Experimental Drought and Warming in a Mediterranean Shrubland

et al. 2017

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Climatic warming and drying are having profound impacts on terrestrial carbon cycling by altering plant physiological traits and photosynthetic processes, particularly for species in the semi-arid Mediterranean ecosystems. More effective methods of remote sensing are needed to accurately assess the physiological responses and seasonal photosynthetic activities of evergreen species to climate change. We evaluated the stand reflectance in parallel to the diurnal and seasonal changes in gas exchange, fluorescence and water contents of leaves and soil for a Mediterranean evergreen shrub, Erica multiflora, submitted to long-term experimental warming and drought. We also calculated a differential photochemical reflectance index (∆PRI, morning PRI subtracted from midday PRI) to assess the diurnal responses of photosynthesis (∆A) to warming and drought. The results indicated that the PRI, but not the normalized difference vegetation index (NDVI), was able to assess the seasonal changes of photosynthesis. Changes in water index (WI) were consistent with seasonal foliar water content (WC). In the warming treatment, ∆A value was higher than control in winter but ∆Yield was significantly lower in both summer and autumn, demonstrating the positive effect of the warming on the photosynthesis in winter and the negative effect in summer and autumn, i.e., increased photosynthetic midday depression in summer and autumn, when temperatures were much higher than in winter. Drought treatment increased the midday depression of photosynthesis in summer. Importantly, ∆PRI was significantly correlated with ∆A both under warming and drought, indicating the applicability of ∆PRI for tracking the midday depression of photosynthetic processes. Using PRI and ∆PRI to monitor the variability in photosynthesis could provide a simple method to remotely sense photosynthetic seasonality and midday depression in response to ongoing and future environmental stresses.

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Relationships between photochemical reflectance index and light-use efficiency in deciduous and evergreen broadleaf forests

Cited by 79 publications

References 50 publications

Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees

Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

Photochemical Reflectance Index (PRI) for Detecting Responses of Diurnal and Seasonal Photosynthetic Activity to Experimental Drought and Warming in a Mediterranean Shrubland

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