Remotely sensed blue and red fluorescence emission for monitoring vegetation

Moya, I.; Guyot, G.; Goulas, Y.

doi:10.1016/0924-2716(92)90033-6

Cited by 33 publications

(20 citation statements)

References 27 publications

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“…As fluorescence emission competes with photochemical conversion and heat dissipation of the excess energy, chlorophyll fluorescence (ChlF) has long been considered as a convenient non-intrusive probe to assess photosynthetic processes in chloroplasts and leaves (for a comprehensive review, see [2][3][4]). However, assessment of ChlF at larger scales has long been limited by the power of light sources that can be used to excite fluorescence from remote distances [5]. In the last decade, new methods for the remote sensing of ChlF at canopy level were developed to disentangle sun-induced fluorescence (SIF) from reflected light.…”

Section: Introductionmentioning

confidence: 99%

Gross Primary Production of a Wheat Canopy Relates Stronger to Far Red Than to Red Solar-Induced Chlorophyll Fluorescence

et al. 2017

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Sun-induced chlorophyll fluorescence (SIF) is a radiation flux emitted by chlorophyll molecules in the red (RSIF) and far red region (FRSIF), and is considered as a potential indicator of the functional state of photosynthesis in remote sensing applications. Recently, ground studies and space observations have demonstrated a strong empirical linear relationship between FRSIF and carbon uptake through photosynthesis (GPP, gross primary production). In this study, we investigated the potential of RSIF and FRSIF to represent the functional status of photosynthesis at canopy level on a wheat crop. RSIF and FRSIF were continuously measured in the O 2 -B (SIF687) and O 2 -A bands (SIF760) at a high frequency rate from a nadir view at a height of 21 m, simultaneously with carbon uptake using eddy covariance (EC) techniques. The relative fluorescence yield (Fyield) and the photochemical yield were acquired at leaf level using active fluorescence measurements. SIF was normalized with photosynthetically active radiation (PAR) to derive apparent spectral fluorescence yields (ASFY687, ASFY760). At the diurnal scale, we found limited variations of ASFY687 and ASFY760 during sunny days. We also did not find any link between Fyield and light use efficiency (LUE) derived from EC, which would prevent SIF from indicating LUE changes. The coefficient of determination (r 2 ) of the linear regression between SIF and GPP is found to be highly variable, depending on the emission wavelength, the time scale of observation, sky conditions, and the phenological stage. Despite its photosystem II (PSII) origin, SIF687 correlates less than SIF760 with GPP in any cases. The strongest SIF-GPP relationship was found for SIF760 during canopy growth. When canopy is in a steady state, SIF687 and SIF760 are almost as effective as PAR in predicting GPP. Our results imply some constraints in the use of simple linear relationships to infer GPP from SIF, as they are expected to be better predictive with far red SIF for canopies with a high dynamic range of green biomass and a low LUE variation range.

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Section: Introductionmentioning

confidence: 99%

Gross Primary Production of a Wheat Canopy Relates Stronger to Far Red Than to Red Solar-Induced Chlorophyll Fluorescence

et al. 2017

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“…Chlorophyll fluorescence (ChlF) is known to carry very specific information about leaf light-use efficiency, i.e., plant vitality and biomass productivity. Passive remote sensing techniques like the measurement of solar-induced chlorophyll fluorescence, which is modulated by photosynthetic efficiency, should improve our knowledge of the terrestrial carbon cycle and help us monitoring vegetation health from airborne or spaceborne platforms (Moya et al 1992;Davidson et al, 2003;Moya & Cerovic, 2004;Grace et al, 2007;Guanter et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

FluorMODleaf: A new leaf fluorescence emission model based on the PROSPECT model

Pedrós

Goulas

Jacquemoud

et al. 2010

Remote Sensing of Environment

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103

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A new model of chlorophyll a fluorescence emission by plant leaves, FluorMODleaf, is presented. It is an extension of PROSPECT, a widely used leaf optical properties model that regards the leaf as a pile of N absorbing and diffusing elementary plates. In FluorMODleaf, fluorescence emission of an infinitesimal layer of thickness dx is integrated over the entire elementary plate. The fluorescence source function is based on the excitation spectrum of diluted isolated thylakoids and on the emission spectra of isolated photosystems, PSI and PSII, which are the main pigment-protein complexes involved in the initial stages of photosynthesis. Scattering within the leaf is produced by multiple reflections within and between elementary plates. The input variables of FluorMODleaf are: the number of elementary plates N, also called leaf structure parameter, the total chlorophyll content C ab , the total carotenoid content C cx , the equivalent water thickness C w , and the dry matter content C m (or leaf mass per area), as in the new PROSPECT-5, plus the σ II /σ I ratio referring to the relative absorption cross section of PSI and PSII, and the fluorescence quantum efficiency of PSI and PSII, τ I and τ II , that are introduced here as mean fluorescence lifetimes. The model, which considers the reabsorption of emitted light within the leaf, allows good quantitative estimation of both upward and downward apparent spectral fluorescence yield (ASFY) at different excitation wavelengths from 400 nm to 700 nm. It also emphasizes the role of scattering in fluorescence emission by leaves having high chlorophyll content.

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“…The blue-green fluorescence is regarded as signals from various plant phenolics[9]. The red and far-red fluorescence are due to chlorophyll a[9]. By the pre-UV-Typical changes of the LIF spectra in peanut (Arachis hypogaea L.) leaves by a series of UV-B&VR treatments.…”

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confidence: 99%

“…The LIF spectrum from the control leaf (solid line) had a smallshoulder in the blue-green region (400-600 nm) and two large peaks (F685 and F740) from the red to far-red region. The blue-green fluorescence is regarded as signals from various plant phenolics[9]. The red and far-red fluorescence are due to chlorophyll a[9].…”

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confidence: 99%

Impacts of UV-A Irradiation on Laser-Induced Fluorescence Spectra in UV-B Damaged Peanut (Arachis hypogaeaL.) Leaves

Fukuchi¹,

Takahashi²,

Tatsumoto³

2004

Environmental Technology

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Influence of ultraviolet A (UV-A) exerted on ultraviolet B (UV-B) damaged peanut leaves was examined by using the laser-induced fluorescence (LIF) method. The vitality index of the leaves was estimated from the measurement of the induction kinetics of chlorophyll fluorescence that was done in parallel with LIF spectra measurement. Visible ray irradiation of several hours to the UV-B damaged leaves recovered the vitality index of the leaves, while UV-A irradiation for the same period to the UV-B damaged leaves decreased the vitality index remarkably. No significant decrease of the vitality index was seen by the UV-A irradiation of several hours to the control (damage-less) leaves. It was understood that the UV-A irradiation to the UV-B damaged leaves causes the synergistic decrease of the vitality index. It is known that UV-absorbing pigments induced by UV-B irradiation are able to reduce not only UV penetration into the leaf but also photo-system II damage of the leaves. In this experiment, it is thought that the UV-absorbing pigments were decomposed by the UV-A irradiation and so further decreased in the vitality index of the leaves.

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Remotely sensed blue and red fluorescence emission for monitoring vegetation

Cited by 33 publications

References 27 publications

Gross Primary Production of a Wheat Canopy Relates Stronger to Far Red Than to Red Solar-Induced Chlorophyll Fluorescence

Gross Primary Production of a Wheat Canopy Relates Stronger to Far Red Than to Red Solar-Induced Chlorophyll Fluorescence

FluorMODleaf: A new leaf fluorescence emission model based on the PROSPECT model

Impacts of UV-A Irradiation on Laser-Induced Fluorescence Spectra in UV-B Damaged Peanut (Arachis hypogaeaL.) Leaves

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