Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field

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...

Descripción completa

Detalles Bibliográficos
Autores principales:	Moya, Ismael, Quiroz, Roberto A, y 4 autores más
Formato:	Artículo
Lenguaje:	Inglés
Publicado:	Photosynthesis Research 2022
Materias:	FLUORESCENCIA FLUORESCENCE FESTUCA ESTRES DE SEQUIA DROUGHT STRESS µ-LIDAR STRESS DETECTION Sede Central
Acceso en línea:	https://repositorio.catie.ac.cr/handle/11554/12198

id	RepoCATIE12198
record_format	dspace
spelling	RepoCATIE121982022-12-17T17:42:18Z Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field Moya, Ismael Quiroz, Roberto A y 4 autores más FLUORESCENCIA FLUORESCENCE FESTUCA ESTRES DE SEQUIA DROUGHT STRESS µ-LIDAR STRESS DETECTION Sede Central 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. 2022-12-15T16:34:35Z 2022-12-15T16:34:35Z 2022 Artículo https://repositorio.catie.ac.cr/handle/11554/12198 openAccess en Photosynthesis Research https://doi.org/10.1007/s11120-019-00642-9 17 páginas application/pdf Photosynthesis Research
institution	Centro Agronómico Tropical de Investigación y Enseñanza
collection	Repositorio CATIE
language	Inglés
topic	FLUORESCENCIA FLUORESCENCE FESTUCA ESTRES DE SEQUIA DROUGHT STRESS µ-LIDAR STRESS DETECTION Sede Central
spellingShingle	FLUORESCENCIA FLUORESCENCE FESTUCA ESTRES DE SEQUIA DROUGHT STRESS µ-LIDAR STRESS DETECTION Sede Central Moya, Ismael Quiroz, Roberto A y 4 autores más Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
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 Quiroz, Roberto A y 4 autores más
author_facet	Moya, Ismael Quiroz, Roberto A y 4 autores más
author_sort	Moya, Ismael
title	Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
title_short	Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
title_full	Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
title_fullStr	Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
title_full_unstemmed	Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
title_sort	active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
publisher	Photosynthesis Research
publishDate	2022
url	https://repositorio.catie.ac.cr/handle/11554/12198
work_keys_str_mv	AT moyaismael activeinsituandpassiveairbornefluorescencemeasurementsforwaterstressdetectiononafescuefield AT quirozrobertoa activeinsituandpassiveairbornefluorescencemeasurementsforwaterstressdetectiononafescuefield AT y4autoresmas activeinsituandpassiveairbornefluorescencemeasurementsforwaterstressdetectiononafescuefield
_version_	1808117408394641408

Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field

Ejemplares similares