title: Upward and downward solar-induced chlorophyll fluorescence yield indices of four tree species as indicators of traffic pollution in Valencia.
abstract: Passive steady-state chlorophyll fluorescence (Fs) provides a direct diagnosis of the functional status of vegetation photosynthesis. With the prospect of mapping Fs using remote sensing techniques, field measurements are mandatory to understand to which extent Fs allows detecting plant stress in different environments. Trees of four common species in Valencia were classified in either a low or a high local traffic exposure class based on their leaf magnetic value. Upward and downward hyperspectral fluorescence yield (FY) and indices based on the two Fs peaks (at 687 and 741 nm) were calculated. FY indices of P. canariensis and P. x acerifolia were significantly different between the two traffic exposure classes defined, but not for C. australis nor M. alba. While chlorophyll content could not indicate the difference between low and high traffic exposure, the FY(687)/FY(741) peak ratio increased significantly (p < 0.05) for both leaf sides for the higher traffic exposure class.
authors.affiliation: Department of Bioscience Engineering, Faculty of Sciences, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium. Shari.VanWittenberghe@ua.ac.be
authors.forename: Shari
authors.initials: S
authors.lastname: Van Wittenberghe
authors.forename: Luis
authors.initials: L
authors.lastname: Alonso
authors.forename: Jochem
authors.initials: J
authors.lastname: Verrelst
authors.forename: Inge
authors.initials: I
authors.lastname: Hermans
authors.forename: Jesús
authors.initials: J
authors.lastname: Delegido
authors.forename: Frank
authors.initials: F
authors.lastname: Veroustraete
authors.forename: Roland
authors.initials: R
authors.lastname: Valcke
authors.forename: José
authors.initials: J
authors.lastname: Moreno
authors.forename: Roeland
authors.initials: R
authors.lastname: Samson
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D001336:Automobiles / Q000706:statistics & numerical data; D002734:Chlorophyll / Q000378:metabolism*; D004784:Environmental Monitoring / Q000379:methods*; D005453:Fluorescence; D010788:Photosynthesis; D013030:Spain; D013472:Sunlight; D014197:Trees / Q000502:physiology*; D001335:Vehicle Emissions / Q000032:analysis
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions; D002734:Chlorophyll