2022
DOI: 10.1111/nph.17920
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Heatwave breaks down the linearity between sun‐induced fluorescence and gross primary production

Abstract: Summary Sun‐induced fluorescence in the far‐red region (SIF) is increasingly used as a remote and proximal‐sensing tool capable of tracking vegetation gross primary production (GPP). However, the use of SIF to probe changes in GPP is challenged during extreme climatic events, such as heatwaves. Here, we examined how the 2018 European heatwave (HW) affected the GPP–SIF relationship in evergreen broadleaved trees with a relatively invariant canopy structure. To do so, we combined canopy‐scale SIF measurements,… Show more

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Cited by 75 publications
(42 citation statements)
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References 69 publications
(103 reference statements)
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“…When Tshock was large enough, flexible NPQ dissipation is activated, leading to potential declines in photosynthetic efficiency (Porcar-Castell et al, 2004). This is suggested in our dataset by reduced Fv/Fm and moderate but significant increases in ФNPQ and decreases in Фp(II) (Figure 7) in agreement with the results of Martini et al, (2022). In our study, ФNPQ and Фp(II) for plants in hot days under drought conditions did not seem sensitive to changes in Tshock as they were already functioning with a lower photochemical efficiency from the sustained effect of photoinhibition described before with not clear responses in fluorescence (Figure 7).…”
Section: Thermoregulation Under Heat Stress Dayssupporting
confidence: 92%
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“…When Tshock was large enough, flexible NPQ dissipation is activated, leading to potential declines in photosynthetic efficiency (Porcar-Castell et al, 2004). This is suggested in our dataset by reduced Fv/Fm and moderate but significant increases in ФNPQ and decreases in Фp(II) (Figure 7) in agreement with the results of Martini et al, (2022). In our study, ФNPQ and Фp(II) for plants in hot days under drought conditions did not seem sensitive to changes in Tshock as they were already functioning with a lower photochemical efficiency from the sustained effect of photoinhibition described before with not clear responses in fluorescence (Figure 7).…”
Section: Thermoregulation Under Heat Stress Dayssupporting
confidence: 92%
“…Most likely, due to the short duration and limited maximum T air of the hot days in our experiment, the thermal safety margins were not passed. This is supported by observed significantly lower average values of Φ NPQ during hot days compared to normal days (Table 2), contrary to a recent study, where during heat stress plants increased dissipation through NPQ causing also change in the allocation of energy towards SIF (Martini et al, 2022). During hot days, the rapid increase in T air seems to affect photochemistry more than the absolute value of T L .…”
Section: Discussionsupporting
confidence: 64%
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“…SIF represents the light re‐emitted from chlorophyll during the light reactions of photosynthesis, and both theory and observations indicate that SIF is correlated with photosynthetic activity and directly linked to both PAR absorbed by the plant canopy and light‐use efficiency of vegetation (Porcar‐Castell et al, 2014), especially when integrated over relatively long periods at the canopy scale (Magney et al, 2020). Compared with many other vegetation indices, SIF also better captures seasonality and variability of dryland GPP (Smith et al, 2018; Wang et al, 2022), though the linearity of the SIF–GPP relationship may break down under extreme heat and drought (Martini et al, 2022). The CSIF dataset was generated by training and validating a neural network with clear‐sky SIF retrievals from the Orbiting Carbon Observatory‐2 (OCO‐2) and MODIS‐derived nadir bidirectional reflectance distribution adjusted surface reflectance (MCD43C4).…”
Section: Methodsmentioning
confidence: 99%
“…SIF is the radiation emitted by chlorophyll containing plants upon sun's exposure and it is generally considered a good proxy of gross primary production (GPP) (Porcar-Castell et al, 2014). Importantly, the relationship between GPP and SIF is not universal, and it is highly influenced by nonphotochemcal quenching (NPQ) (Martini et al 2021), which represents the third major pathway of allocation of absorbed photosynthetic active radiation (APAR), besides photosynthesis and fluorescence emission. The rationale used to justify SIF as a predictor of LEt is that stomatal opening is mediating both the photosynthetic and transpiration processes and SIF contains information on photosynthetic activity (Maes et al, 2020).…”
Section: Introductionmentioning
confidence: 99%