Concepts and Applications of Chlorophyll Fluorescence: A Remote Sensing Perspective

Choudhary, Karun Kumar; Chakraborty, Abhishek; Kumari, Mamta

doi:10.1007/978-981-15-6864-0_7

Cited by 3 publications

(3 citation statements)

References 117 publications

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“…The red chlorophyll fluorescence (ChlF) signal is generally associated with PS‐II (Porcar‐Castell et al., 2014, 2021) and not significantly correlated with PS‐I. Photosystem II is extremely sensitive to stress‐related impacts on plant metabolism, photosystem functional efficiency, photoprotection, and heat dissipation, whereas PS‐I is relatively insensitive to illumination intensity (Choudhary et al., 2021; Porcar‐Castell et al., 2014). As PS‐II is highly sensitive to photosynthetic metabolism and is the dominant contributor to ChlF emission, especially in the red wavelength range, the strong response of SIF red to GPP under a smaller reabsorption effect is reasonable.…”

Section: Discussionmentioning

confidence: 99%

“…Solar‐induced chlorophyll fluorescence (SIF) is a promising remotely sensed proxy for photosynthesis, as estimated by gross primary productivity (GPP), at the ecosystem scale (Choudhary et al., 2021). Although eddy flux tower measurements have expanded globally through networks such as FLUXNET, there remain unsampled areas covering various ecosystem types and vast areas of the Earth's surface, mostly because of the extreme technological and logistical demands for instrument management: for example, logistical access to the site, accessibility of electricity supply, and availability of an internet signal for remote access (Canadell et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

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Solar‐Induced Chlorophyll Fluorescence as a Potential Proxy for Gross Primary Production and Methane Emission in a Cool‐Temperate Bog in Northern Japan

Buareal,

Kato,

Morozumi

et al. 2024

JGR Biogeosciences

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Wetlands play an essential role in the global greenhouse gas budget via carbon dioxide sequestration as well as methane emission. In recent decades, solar‐induced chlorophyll fluorescence (SIF) has been recognized as a remotely sensed proxy of gross primary productivity (GPP), which generates substrates for methane production. To examine the suitability of SIF for estimation of these two fluxes, we conducted ground tower‐based SIF observation with an ultrafine‐resolution spectroradiometer in conjunction with eddy covariance measurement in a cool‐temperate bog. The daily SIF retrieved in the red (687 nm) and far‐red (760 nm) bands (SIFred and SIFfar‐red, respectively) increased nonlinearly with GPP and linearly with absorbed photosynthetically active radiation (APAR). The relatively weak correlation between apparent SIF yield (ΦSIF = SIF/APAR) and light use efficiency implied that both APAR and plant physiology constrained the SIF emission in this wetland. The SIFred/SIFfar‐red ratio showed a significant negative relationship with vegetation greenness indices, and the similar seasonal variation in SIFred and SIFfar‐red indicated that the SIFred reabsorption effect only weakly influenced the SIFred–GPP relationship. Episodic temporal reduction in the water table did not distinctly influence SIF and ΦSIF. Estimation of the methane emission rate was subtly improved by incorporating SIF, which was substituted for GPP as the methanogenesis substrate, in a multivariable regression analysis together with two environmental factors: soil temperature and water table depth. This study illustrates the potential of both SIFred and SIFfar‐red to monitor GPP and to predict methane emission in wetlands.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solar‐Induced Chlorophyll Fluorescence as a Potential Proxy for Gross Primary Production and Methane Emission in a Cool‐Temperate Bog in Northern Japan

Buareal,

Kato,

Morozumi

et al. 2024

JGR Biogeosciences

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“…This work is particularly timely, given anticipated improvements of SIF detection with new generation hyperspectral sensors (e.g., Erickson et al, 2019;Köhler et al, 2020;Tenjo et al, 2021) and the increased use of ST-ChlF instruments on autonomous, in-situ platforms. Guidance and inspiration can be taken from the terrestrial remote sensing community, where paired measurements of active and passive ChlF in laboratory and field have been extensively utilized to examine fluorescence-photosynthesis linkages and explain observed diurnal, seasonal, and stress-induced variations in remotely sensed SIF (e.g., Porcar-Castell et al, 2014;Magney et al, 2017;Wyber et al, 2017;Maguire et al, 2020;Choudhary et al, 2021).…”

Section: St-chlf and The Interpretation Of Sun Induced Chlfmentioning

confidence: 99%

Single-Turnover Variable Chlorophyll Fluorescence as a Tool for Assessing Phytoplankton Photosynthesis and Primary Productivity: Opportunities, Caveats and Recommendations

et al. 2021

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Phytoplankton photosynthetic physiology can be investigated through single-turnover variable chlorophyll fluorescence (ST-ChlF) approaches, which carry unique potential to autonomously collect data at high spatial and temporal resolution. Over the past decades, significant progress has been made in the development and application of ST-ChlF methods in aquatic ecosystems, and in the interpretation of the resulting observations. At the same time, however, an increasing number of sensor types, sampling protocols, and data processing algorithms have created confusion and uncertainty among potential users, with a growing divergence of practice among different research groups. In this review, we assist the existing and upcoming user community by providing an overview of current approaches and consensus recommendations for the use of ST-ChlF measurements to examine in-situ phytoplankton productivity and photo-physiology. We argue that a consistency of practice and adherence to basic operational and quality control standards is critical to ensuring data inter-comparability. Large datasets of inter-comparable and globally coherent ST-ChlF observations hold the potential to reveal large-scale patterns and trends in phytoplankton photo-physiology, photosynthetic rates and bottom-up controls on primary productivity. As such, they hold great potential to provide invaluable physiological observations on the scales relevant for the development and validation of ecosystem models and remote sensing algorithms.

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Intercropping improves faba bean photosynthesis and reduces disease caused by Fusarium commune and cinnamic acid-induced stress

Yang,

Zhang,

Yuan

et al. 2024

BMC Plant Biol

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Modern intensive cropping systems often contribute to the accumulation of phenolic acids in the soil, which promotes the development of soilborne diseases. This can be suppressed by intercropping. This study analyzed the effects of intercropping on Fusarium wilt based on its effect on photosynthesis under stress by the combination of Fusarium commune and cinnamic acid. The control was not inoculated with F. commune, while the faba bean plants (Vicia faba L.) were inoculated with this pathogen in the other treatments. The infected plants were also treated with cinnamic acid. This study examined the development of Fusarium wilt together with its effects on the leaves, absorption of nutrients, chlorophyll fluorescence parameters, contents of photosynthetic pigments, activities of photosynthetic enzymes, gas exchange parameters, and the photosynthetic assimilates of faba bean from monocropping and intercropping systems. Under monocropping conditions, the leaves of the plants inoculated with F. commune grew significantly less, and there was enhanced occurrence of the Fusarium wilt compared with the control. Compared with the plants solely inoculated with F. commune, the exogenous addition of cinnamic acid to the infected plants significantly further reduced the growth of faba bean leaves and increased the occurrence of Fusarium wilt. A comparison of the combination of F. commune and cinnamic acid in intercropped wheat and faba bean compared with monocropping showed that intercropping improved the absorption of nutrients, increased photosynthetic pigments and its contents, electron transport, photosynthetic enzymes, and photosynthetic assimilates. The combination of these factors reduced the occurrence of Fusarium wilt in faba bean and increased the growth of its leaves. These results showed that intercropping improved the photosynthesis, which promoted the growth of faba bean, thus, reducing the development of Fusarium wilt following the stress of infection by F. commune and cinnamic acid. This research should provide more information to enhance sustainable agriculture.

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Concepts and Applications of Chlorophyll Fluorescence: A Remote Sensing Perspective

Cited by 3 publications

References 117 publications

Solar‐Induced Chlorophyll Fluorescence as a Potential Proxy for Gross Primary Production and Methane Emission in a Cool‐Temperate Bog in Northern Japan

Solar‐Induced Chlorophyll Fluorescence as a Potential Proxy for Gross Primary Production and Methane Emission in a Cool‐Temperate Bog in Northern Japan

Single-Turnover Variable Chlorophyll Fluorescence as a Tool for Assessing Phytoplankton Photosynthesis and Primary Productivity: Opportunities, Caveats and Recommendations

Intercropping improves faba bean photosynthesis and reduces disease caused by Fusarium commune and cinnamic acid-induced stress

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