Contribution of chlorophyll fluorescence to the reflectance of corn foliage

Campbell, P. K. E.; Middleton, Elizabeth M.; Corp, Lawrence A.; McMurtrey, J. E.; Kim, M.S.; Chappelle, Emmett W.; Butcher, L.M.

doi:10.1109/igarss.2002.1026771

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The main problem for the detection of the F s signal is its low intensity when it is compared with the radiation reflected by plants. Recent studies established F s in the 750 nm region to be about 2%, on average, of the plant reflectance in such spectral region [Zarco-Tejada et al, 2003;Campbell et al, 2002]. The Fraunhofer Line Discriminator (FLD) [Plascyk, 1975] principle is the most widely used in the detection of fluorescence.…”

Section: Introductionmentioning

confidence: 99%

Estimation of solar‐induced vegetation fluorescence from space measurements

Guanter

Alonso

Gómez-Chova

et al. 2007

Geophysical Research Letters

131

106

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[1] A characteristic spectral emission is observed in vegetation chlorophyll under excitation by solar radiation. This emission, known as solar-induced chlorophyll fluorescence, occurs in the red and near infra-red spectral regions. In this paper a new methodology for the estimation of solar-induced chlorophyll fluorescence from spaceborne and airborne sensors is presented. The fluorescence signal is included in an atmospheric radiative transfer scheme so that chlorophyll fluorescence and surface reflectance are retrieved consistently from the measured at-sensor radiance. This methodology is tested on images acquired by the

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Section: Introductionmentioning

confidence: 99%

Estimation of solar‐induced vegetation fluorescence from space measurements

Guanter

Alonso

Gómez-Chova

et al. 2007

Geophysical Research Letters

131

106

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“…Solar-induced ChlF emission spectrum is characterized by two peaks at approximately 690 and 740 nm (Meroni et al, 2009; Van der Tol et al, 2016). Typically, only about 1% of the absorbed sunlight is reemitted through ChlF (Baker, 2008) and contributed up to 2% on the apparent reflectance in the 750-nm spectral region (Campbell et al, 2002; Liu et al, 2005; Pérez-Priego et al, 2005). ChlF radiance at 760 nm (F 760 ) generally increased with increasing Chl concentration while ChlF radiance at 685 nm (F 685 ) decreased due to re-absorption of the emitted fluorescence signal, and the variations in the ratio of F 685 and F 760 were most likely related to structural variables such as CCC (Ač et al, 2015; Wieneke et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Corn Canopy Chlorophyll Content Using Derivative Spectra in the O2–A Absorption Band

Zhang

Wang

et al. 2019

Front. Plant Sci.

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Chlorophyll (Chl) is one of the most important classes of light-absorbing pigments in photosynthesis, and the proportion of Chl in leaves is closely related to vegetation nutrient status. Remote sensing-based estimation of Chl content holds great potential for evaluating crop growth status in agricultural management, precision farming and ecosystem monitoring. Recent studies have shown that steady-state fluorescence contributed up to 2% on the apparent reflectance in the 750-nm spectral region of plant and also provided additional evidence for fluorescence in-filling of the atmospheric oxygen absorption band at a central wavelength of 760 nm (O 2 –A band). In this study, an in situ hyperspectral remote sensing approach zwas employed to estimate corn Chl content at the canopy level by using chlorophyll fluorescence (ChlF) signals in the O 2 –A absorption band. Two new spectral indices, REArea 760 (sum of first derivative reflectance between 755 and 763 nm) and REA 760 (maximum of first derivative reflectance between 755 and 763 nm), derived from the first derivative spectra in the O 2 –A band, were proposed for estimating the corn canopy Chl content (CCC). They were compared with the performance of published indices measured at ground level, including the MERIS Terrestrial Chlorophyll Index (MTCI), Optimized Soil-Adjusted Vegetation Index 2 (OSAVI2), Modified Chlorophyll Absorption Ratio Index 2 (MCARI2), SR710, REArea (sum of first derivative reflectance between 680 and 780 nm), REA (maximum value of first derivative reflectance between 680 and 780 nm), and mND 705 . The results indicated that corn Chl content at the canopy level was better predicted by the new indices (with R 2 = 0.835) than the published indices (with R 2 ranging from 0.676 to 0.826). The two new indices ranked in the top four according to their summed ranks by integrating the ranks of RMSE and R 2 of CCC linear regression models. ChlF originates only from chlorophyll in the photosynthetic apparatus and therefore is less sensitive to soil, wood, and dead biomass interference. Moreover, due to the fluorescence in-filling of the O 2 –A band and the amplified effect on spectrum signals by derivative operation, the spectral derivative indices in the O 2 –A band have great potential for estimating the CCC.

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"Red edge" optical properties of corn leaves from different nitrogen regimes

Middleton¹,

Campbell²,

McMurtrey³

et al.

IEEE International Geoscience and Remote Sensing Symposium

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High resolution (< 2 nm) optical spectra and biophysical measurements were acquired from corn leaves from field plots having four nitrogen fertilizer application rates: 20%, 50%, 100% and 150% of optimal levels. Reflectance (R), transmittance (T), and absorptance (A) spectra were obtained for both adaxial and abaxial leaf surfaces. The strongest relationships between foliar chemistry and optical properties were demonstrated for C/N content and two optical parameters associated with the "red edge inflection point" (REIP): 1) a normalized first derivative maximum (Dmax) occurring between 695 and 730 nm (Dmax/D744); and 2) the wavelength associated with Dmax (WL of REIP). A non-linear increase in the Dmax/D744 ratio as a function of C/N content was observed for all optical properties (r 2 = 0.90-0.95). Similarly, a non-linear decrease in the WL of REIP as a function of C/N content was observed for all optical properties (RT, RB, TT, and AT) (r 2 = 0.85-0.96). The Dmax/D744 ratio increased as the WL of REIP declined from ~730 to 700 nm, with curves per optical property expressing different degrees of non-linearity.

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Contribution of chlorophyll fluorescence to the reflectance of corn foliage

Cited by 5 publications

References 9 publications

Estimation of solar‐induced vegetation fluorescence from space measurements

Estimation of solar‐induced vegetation fluorescence from space measurements

Estimation of Corn Canopy Chlorophyll Content Using Derivative Spectra in the O2–A Absorption Band

"Red edge" optical properties of corn leaves from different nitrogen regimes

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