Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar

LEDFLEX is a micro-lidar dedicated to the measurement of vegetation fluorescence. The light source consists of 4 blue Light-Emitting Diodes (LED) to illuminate part of the canopy in order to average the spatial variability of small crops. The fluorescence emitted in response to a 5-μs width pulse is...

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Main Authors:	Moya, Ismael, Loayza, Hildo, Llanos López, María, Quiroz, Roberto, Ounis, Abderrahmane, Goulas, Yves
Format:	Artículo
Language:	Inglés
Published:	Springer Link 2020
Online Access:	https://repositorio.catie.ac.cr/handle/11554/9332

id	RepoCATIE9332
record_format	dspace
spelling	RepoCATIE93322022-08-05T19:07:52Z Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar Moya, Ismael Loayza, Hildo Llanos López, María Quiroz, Roberto Ounis, Abderrahmane Goulas, Yves LEDFLEX is a micro-lidar dedicated to the measurement of vegetation fluorescence. The light source consists of 4 blue Light-Emitting Diodes (LED) to illuminate part of the canopy in order to average the spatial variability of small crops. The fluorescence emitted in response to a 5-μs width pulse is separated from the ambient light through a synchronized detection. Both the reflectance and the fluorescence of the target are acquired simultaneously in exactly the same field of view, as well as the photosynthetic active radiation and air temperature. The footprint is about 1 m2 at a distance of 8 m. By increasing the number of LEDs longer ranges can be reached. The micro-lidar has been successfully applied under full sunlight conditions to establish the signature of water stress on pea (Pisum Sativum) canopy. Under well-watered conditions the diurnal cycle presents an M shape with a minimum (Fmin) at noon which is Fmin > Fo. After several days withholding watering, Fs decreases and Fmin < Fo. The same patterns were observed on mint (Menta Spicata) and sweet potatoes (Ipomoea batatas) canopies. Active fluorescence measurements with LEDFLEX produced robust fluorescence yield data as a result of the constancy of the excitation intensity and its geometry fixity. Passive methods based on Sun-Induced chlorophyll Fluorescence (SIF) that uses high-resolution spectrometers generate only flux data and are dependent on both the 3D structure of vegetation and variable irradiance conditions along the day. Parallel measurements with LEDFLEX should greatly improve the interpretation of SIF changes. 2020-01-14T16:22:49Z 2020-01-14T16:22:49Z 2019 Artículo https://repositorio.catie.ac.cr/handle/11554/9332 en Photosynthesis Research info:eu-repo/semantics/openAccess application/pdf Springer Link
institution	Centro Agronómico Tropical de Investigación y Enseñanza
collection	Repositorio CATIE
language	Inglés
description	LEDFLEX is a micro-lidar dedicated to the measurement of vegetation fluorescence. The light source consists of 4 blue Light-Emitting Diodes (LED) to illuminate part of the canopy in order to average the spatial variability of small crops. The fluorescence emitted in response to a 5-μs width pulse is separated from the ambient light through a synchronized detection. Both the reflectance and the fluorescence of the target are acquired simultaneously in exactly the same field of view, as well as the photosynthetic active radiation and air temperature. The footprint is about 1 m2 at a distance of 8 m. By increasing the number of LEDs longer ranges can be reached. The micro-lidar has been successfully applied under full sunlight conditions to establish the signature of water stress on pea (Pisum Sativum) canopy. Under well-watered conditions the diurnal cycle presents an M shape with a minimum (Fmin) at noon which is Fmin > Fo. After several days withholding watering, Fs decreases and Fmin < Fo. The same patterns were observed on mint (Menta Spicata) and sweet potatoes (Ipomoea batatas) canopies. Active fluorescence measurements with LEDFLEX produced robust fluorescence yield data as a result of the constancy of the excitation intensity and its geometry fixity. Passive methods based on Sun-Induced chlorophyll Fluorescence (SIF) that uses high-resolution spectrometers generate only flux data and are dependent on both the 3D structure of vegetation and variable irradiance conditions along the day. Parallel measurements with LEDFLEX should greatly improve the interpretation of SIF changes.
format	Artículo
author	Moya, Ismael Loayza, Hildo Llanos López, María Quiroz, Roberto Ounis, Abderrahmane Goulas, Yves
spellingShingle	Moya, Ismael Loayza, Hildo Llanos López, María Quiroz, Roberto Ounis, Abderrahmane Goulas, Yves Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
author_facet	Moya, Ismael Loayza, Hildo Llanos López, María Quiroz, Roberto Ounis, Abderrahmane Goulas, Yves
author_sort	Moya, Ismael
title	Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
title_short	Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
title_full	Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
title_fullStr	Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
title_full_unstemmed	Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
title_sort	canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar
publisher	Springer Link
publishDate	2020
url	https://repositorio.catie.ac.cr/handle/11554/9332
work_keys_str_mv	AT moyaismael canopychlorophyllfluorescenceappliedtostressdetectionusinganeasytobuildmicrolidar AT loayzahildo canopychlorophyllfluorescenceappliedtostressdetectionusinganeasytobuildmicrolidar AT llanoslopezmaria canopychlorophyllfluorescenceappliedtostressdetectionusinganeasytobuildmicrolidar AT quirozroberto canopychlorophyllfluorescenceappliedtostressdetectionusinganeasytobuildmicrolidar AT ounisabderrahmane canopychlorophyllfluorescenceappliedtostressdetectionusinganeasytobuildmicrolidar AT goulasyves canopychlorophyllfluorescenceappliedtostressdetectionusinganeasytobuildmicrolidar
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Canopy chlorophyll fluorescence applied to stress detection using an easy-to-build micro-lidar

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