Efficiency of chlorophyll in gross primary productivity: A proof of concept and application in crops

Gitelson, Anatoly A.; Yi, Peng; Viña, Andrés; Arkebauer, Timothy J.; Schepers, James S.

doi:10.1016/j.jplph.2016.05.019

Cited by 35 publications

(27 citation statements)

References 51 publications

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“…However, when canopy Chl was above 2 g·m −2 , the decline of canopy Chl minimally affected absorbed radiation, and canopy reflectance was virtually invariant in the PAR and shortwave red edge regions [61]. This was due to the low transmittance of the canopy and the shortened path length of light inside the canopy [61,63]. When canopy Chl dropped below 1.5 g·m −2 , the difference in reflectance between the two stages became increasingly significant, for the whole PAR range in maize ( Figure 1A-C) and the blue and red regions in soybean (Figure 2A,C).…”

Section: Discussionmentioning

confidence: 99%

“…The amount of "illuminated chlorophyll" related to absorbed PAR became higher, and the whole canopy worked efficiently to absorb incident light [64]. Because of increasing chlorophyll efficiency [63], absorbed radiation was still substantial.…”

Section: Discussionmentioning

confidence: 99%

“…Reflectances in the early vegetative stage and the late senescence stage were almost the same ( Figure 2B,D and Figure 3). This was because the soybean canopy architecture and leaf structure are very different from maize [47,63]. The soybean canopy was shorter (approximately 1 m vs. 3 m for maize) and appeared more "closed" to light penetration compared to maize due to the higher leaf area density (i.e., leaf area per unit canopy volume) in soybean.…”

Section: Discussionmentioning

confidence: 99%

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Assessment of Canopy Chlorophyll Content Retrieval in Maize and Soybean: Implications of Hysteresis on the Development of Generic Algorithms

Nguy-Robertson

Arkebauer

et al. 2017

Remote Sensing

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Canopy chlorophyll content (Chl) closely relates to plant photosynthetic capacity, nitrogen status and productivity. The goal of this study is to develop remote sensing techniques for accurate estimation of canopy Chl during the entire growing season without re-parameterization of algorithms for two contrasting crop species, maize and soybean. These two crops represent different biochemical mechanisms of photosynthesis, leaf structure and canopy architecture. The relationships between canopy Chl and reflectance, collected at close range and resampled to bands of the Multi Spectral Instrument (MSI) aboard Sentinel-2, were analyzed in samples taken across the entirety of the growing seasons in three irrigated and rainfed sites located in eastern Nebraska between 2001 and 2005. Crop phenology was a factor strongly influencing the reflectance of both maize and soybean. Substantial hysteresis of the reflectance vs. canopy Chl relationship existed between the vegetative and reproductive stages. The effect of the hysteresis on vegetation indices (VI), applied for canopy Chl estimation, depended on the bands used and their formulation. The hysteresis greatly affected the accuracy of canopy Chl estimation by widely-used VIs with near infrared (NIR) and red reflectance (e.g., normalized difference vegetation index (NDVI), enhanced vegetation index (EVI) and simple ratio (SR)). VIs that use red edge and NIR bands (e.g., red edge chlorophyll index (CI red edge ), red edge NDVI and the MERIS terrestrial chlorophyll index (MTCI)) were minimally affected by crop phenology (i.e., they exhibited little hysteresis) and were able to accurately estimate canopy Chl in two crops without algorithm re-parameterization and, thus, were found to be the best candidates for generic algorithms to estimate crop Chl using the surface reflectance products of MSI Sentinel-2.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Assessment of Canopy Chlorophyll Content Retrieval in Maize and Soybean: Implications of Hysteresis on the Development of Generic Algorithms

Nguy-Robertson

Arkebauer

et al. 2017

Remote Sensing

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“…We assumed that the percentage of active chlorophyll would be higher in the grass-like group. Recently, Gitelson et al 2016 introduced the concept of chlorophyll efficiency, defined as the GPP per incident PAR per chlorophyll content per unit area. This was determined by studying crops with different canopy structures, that is, maize, which is open to incident light, and soybean, which is more closed.…”

Section: 1mentioning

confidence: 99%

“…Although Gitelson et al 2016 treated the two types of crop with different canopy structures and leaf angles differently, grass-like areas were also open to incident light, and deciduous woody plant areas were more closed to light penetration. There may be other factors that affect the differences in the slopes of the two groups, but we believe that the difference in exposure to sunlight is the main reason for the difference.…”

Section: 1mentioning

confidence: 99%

Determination of rice paddy parameters in the global gross primary production capacity estimation algorithm using 6 years of JP-MSE flux observation data

Muramatsu

Ono

Soyama

et al. 2017

J. Agric. Meteorol.

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Gross primary production GPP capacity is defined as GPP under low stress, and the algorithm for its estimation was developed by Thanyapraneedkul et al. 2012 using a light-response curve. The idea behind this algorithm is that the light response curve under low stress is related to chlorophyll content. The parameter is estimated from a vegetation index derived from satellite observations of the green chlorophyll index CI green for seven vegetation types, including rice paddy. These previous studies included 1 year of data for the flux site and MODIS reflectance data. Recently, long-term data have become publicly available for flux data covering a period of 6 years, and MODIS reflectance data covering a period of more than 16 years.This study determined the parameters in the GPP capacity estimation algorithm for rice paddies using 6 years of Mase paddy flux site data and clear daytime reflectance data observed using MODIS. The fitted parameter-related initial slopes of the light -photosynthesis curves for each year were identical within the fitting error. Using the averaged parameter-related initial slope over 6 years, we were able to determine a linear relationship between CI green and the maximum photosynthesis rate at 2000 PAR μmol m 2 s 1 , the slope of which was slightly higher than has been reported previously. Using the parameters for the period 2001 -2006, we investigated how GPP capacity varied for irrigated rice paddy. The ratio of the average GPP capacity to the GPP after transplanting until harvesting was 0.91 for the period 2001 to 2006. This result shows that GPP capacity provides a useful first approximation of GPP for irrigated rice paddies as a framework of the global GPP estimation algorithm.

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Retrieving vegetation biophysical parameters and GPP using satellite-driven LUE model in a National Park

Marandi

Parida

Ghosh

2021

Environ Dev Sustain

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Efficiency of chlorophyll in gross primary productivity: A proof of concept and application in crops

Cited by 35 publications

References 51 publications

Assessment of Canopy Chlorophyll Content Retrieval in Maize and Soybean: Implications of Hysteresis on the Development of Generic Algorithms

Assessment of Canopy Chlorophyll Content Retrieval in Maize and Soybean: Implications of Hysteresis on the Development of Generic Algorithms

Determination of rice paddy parameters in the global gross primary production capacity estimation algorithm using 6 years of JP-MSE flux observation data

Retrieving vegetation biophysical parameters and GPP using satellite-driven LUE model in a National Park

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