Modeling re-absorption of fluorescence from the leaf to the canopy level
Chlorophyll fluorescence is widely used as an indicator of photosynthesis and physiological state of plants. Remote acquisition of fluorescence allows the diagnosis of large field extensions, even from satellite measurements. Nevertheless, fluorescence emerging from chloroplasts, the one directly co...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00344257_v204_n_p138_Romero http://hdl.handle.net/20.500.12110/paper_00344257_v204_n_p138_Romero |
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paper:paper_00344257_v204_n_p138_Romero2023-06-08T15:00:40Z Modeling re-absorption of fluorescence from the leaf to the canopy level Canopy Chlorophyll fluorescence Light re-absorption Photophysical modeling Remote sensing Chlorophyll Physiology Remote sensing Canopy Chlorophyll fluorescence Experimental validations Light re-absorption Photophysical models Satellite measurements Spectral distribution Theoretical development Fluorescence accuracy assessment chloroplast fluorescence measurement method model validation photoperiod photosynthesis physiological response remote sensing satellite data visible spectrum Chlorophyll fluorescence is widely used as an indicator of photosynthesis and physiological state of plants. Remote acquisition of fluorescence allows the diagnosis of large field extensions, even from satellite measurements. Nevertheless, fluorescence emerging from chloroplasts, the one directly connected to plant physiology, undergoes re-absorption processes both within the leaf and the canopy. Therefore, corrections of the observed canopy fluorescence, taking into account these two re-absorption processes may help to draw accurate inferences about plant health. Here, we show the theoretical development and experimental validation of a model that allows to retrieve the spectral distribution of the leaf fluorescence spectrum from that on top of canopy (TOC) using a correction factor which is a function of both canopy and soil reflectance, and canopy transmittance. Canopy fluorescence spectra corrected by our theoretical approach and normalized shows 95% correlation with the normalized fluorescence spectrum at leaf-level, thus validating the model. Therefore, our results provide a physical explanation and quantification for fluorescence re-absorption within the canopy, a phenomenon which has only been mentioned but never measured up to the date. From a more general perspective, this new analytical tool together with the one previously developed by Ramos and Lagorio (2004) allows to obtain the spectral distribution of chloroplast fluorescence spectrum from that on top of canopy (TOC). © 2017 Elsevier Inc. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00344257_v204_n_p138_Romero http://hdl.handle.net/20.500.12110/paper_00344257_v204_n_p138_Romero |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Canopy Chlorophyll fluorescence Light re-absorption Photophysical modeling Remote sensing Chlorophyll Physiology Remote sensing Canopy Chlorophyll fluorescence Experimental validations Light re-absorption Photophysical models Satellite measurements Spectral distribution Theoretical development Fluorescence accuracy assessment chloroplast fluorescence measurement method model validation photoperiod photosynthesis physiological response remote sensing satellite data visible spectrum |
| spellingShingle |
Canopy Chlorophyll fluorescence Light re-absorption Photophysical modeling Remote sensing Chlorophyll Physiology Remote sensing Canopy Chlorophyll fluorescence Experimental validations Light re-absorption Photophysical models Satellite measurements Spectral distribution Theoretical development Fluorescence accuracy assessment chloroplast fluorescence measurement method model validation photoperiod photosynthesis physiological response remote sensing satellite data visible spectrum Modeling re-absorption of fluorescence from the leaf to the canopy level |
| topic_facet |
Canopy Chlorophyll fluorescence Light re-absorption Photophysical modeling Remote sensing Chlorophyll Physiology Remote sensing Canopy Chlorophyll fluorescence Experimental validations Light re-absorption Photophysical models Satellite measurements Spectral distribution Theoretical development Fluorescence accuracy assessment chloroplast fluorescence measurement method model validation photoperiod photosynthesis physiological response remote sensing satellite data visible spectrum |
| description |
Chlorophyll fluorescence is widely used as an indicator of photosynthesis and physiological state of plants. Remote acquisition of fluorescence allows the diagnosis of large field extensions, even from satellite measurements. Nevertheless, fluorescence emerging from chloroplasts, the one directly connected to plant physiology, undergoes re-absorption processes both within the leaf and the canopy. Therefore, corrections of the observed canopy fluorescence, taking into account these two re-absorption processes may help to draw accurate inferences about plant health. Here, we show the theoretical development and experimental validation of a model that allows to retrieve the spectral distribution of the leaf fluorescence spectrum from that on top of canopy (TOC) using a correction factor which is a function of both canopy and soil reflectance, and canopy transmittance. Canopy fluorescence spectra corrected by our theoretical approach and normalized shows 95% correlation with the normalized fluorescence spectrum at leaf-level, thus validating the model. Therefore, our results provide a physical explanation and quantification for fluorescence re-absorption within the canopy, a phenomenon which has only been mentioned but never measured up to the date. From a more general perspective, this new analytical tool together with the one previously developed by Ramos and Lagorio (2004) allows to obtain the spectral distribution of chloroplast fluorescence spectrum from that on top of canopy (TOC). © 2017 Elsevier Inc. |
| title |
Modeling re-absorption of fluorescence from the leaf to the canopy level |
| title_short |
Modeling re-absorption of fluorescence from the leaf to the canopy level |
| title_full |
Modeling re-absorption of fluorescence from the leaf to the canopy level |
| title_fullStr |
Modeling re-absorption of fluorescence from the leaf to the canopy level |
| title_full_unstemmed |
Modeling re-absorption of fluorescence from the leaf to the canopy level |
| title_sort |
modeling re-absorption of fluorescence from the leaf to the canopy level |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00344257_v204_n_p138_Romero http://hdl.handle.net/20.500.12110/paper_00344257_v204_n_p138_Romero |
| _version_ |
1768545729983283200 |