Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field
Date Issued
Date Online
Language
Type
Review Status
Access Rights
Metadata
Full item pageCitation
Moya, I.; Loayza, H.; López, M.L.; Sánchez, J.M.; Goulas, Y.; Ounis, A.; Quiroz, R.; Calera, A. 2022. Active in situ and passive airborne fluorescence measurements for water stress detection on a fescue field. Photosynthesis Research. ISSN 1573-5079.
Permanent link to cite or share this item
External link to download this item
Abstract/Description
Ledflex is a fluorometer adapted to measure chlorophyll fluorescence at the canopy level. It has been described in detail by Moya et al. (2019), Photosynthesis Research. https://doi.org/10.1007/s11120-019-00642-9. We used this instrument to determine the effect of water stress on the fluorescence of a fescue field under extreme temperature and light conditions through a 12 days campaign during summer in a Mediterranean area. The fescue field formed part of a lysimeter station in "las Tiesas," near Albacete-Spain. In addition to the fluorescence data, the surface temperature was measured using infrared radiometers. Furthermore, "Airflex," a passive fluorometer measuring the filling-in of the atmospheric oxygen absorption band at 760 nm, was installed in an ultralight plane and flown during the most critical days of the campaign. We observed with the Ledflex fluorometer a considerable decrease of about 53% of the stationary chlorophyll fluorescence level at noon under water stress, which was well correlated with the surface temperature difference between the stressed and control plots. Airflex data also showed a decrease in far-red solar-induced fluorescence upon water stress in agreement with surface temperature data and active fluorescence measurements after correction for PS I contribution. Notwithstanding, the results from airborne remote sensing are not as precise as in situ active data.
Author ORCID identifiers
Hildo Loayza https://orcid.org/0000-0002-4145-5453
María-Llanos López Gónzalez https://orcid.org/0000-0003-2762-8140
J. M. Sánchez https://orcid.org/0000-0003-1027-9351
Yves Goulas https://orcid.org/0000-0002-6499-1670
Abderrahmane OUNIS https://orcid.org/0000-0002-5606-5466
Roberto Quiroz https://orcid.org/0000-0001-8401-2700
Alfonso José Calera Belmonte https://orcid.org/0000-0003-4271-2439