title: Daily and seasonal dynamics of remotely sensed photosynthetic efficiency in tree canopies.
abstract: The photosynthesis of various species or even a single plant varies dramatically in time and space, creating great spatial heterogeneity within a plant canopy. Continuous and spatially explicit monitoring is, therefore, required to assess the dynamic response of plant photosynthesis to the changing environment. This is a very challenging task when using the existing portable field instrumentation. This paper reports on the application of a technique, laser-induced fluorescence transient (LIFT), developed for ground remote measurement of photosynthetic efficiency at a distance of up to 50 m. The LIFT technique was used to monitor the seasonal dynamics of selected leaf groups within inaccessible canopies of deciduous and evergreen tree species. Electron transport rates computed from LIFT measurements varied over the growth period between the different species studied. The LIFT canopy data and light-use efficiency measured under field conditions correlated reasonably well with the single-leaf pulse amplitude-modulated measurements of broadleaf species, but differed significantly in the case of conifer tree species. The LIFT method has proven to be applicable for a remote sensing assessment of photosynthetic parameters on a diurnal and seasonal scale; further investigation is, however, needed to evaluate the influence of complex heterogeneous canopy structures on LIFT-measured chlorophyll fluorescence parameters.
authors.affiliation: 1Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany Department of Global Ecology, Carnegie Institution of Washington, 260 Panama Street, Stanford, CA 94305, USA r.pieruschka@fz-juelich.de.
authors.forename: Roland
authors.initials: R
authors.lastname: Pieruschka
authors.affiliation: 1Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
authors.forename: Hendrik
authors.initials: H
authors.lastname: Albrecht
authors.affiliation: 1Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
authors.forename: Onno
authors.initials: O
authors.lastname: Muller
authors.affiliation: Department of Global Ecology, Carnegie Institution of Washington, 260 Panama Street, Stanford, CA 94305, USA.
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Berry
authors.affiliation: Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA.
authors.forename: Denis
authors.initials: D
authors.lastname: Klimov
authors.affiliation: Department of Ocean Sciences, 1156 High Street, Santa Cruz, CA 95064, USA.
authors.forename: Zbigniew S
authors.initials: ZS
authors.lastname: Kolber
authors.affiliation: Geography and Environmental Studies, University of Tasmania, Private Bag 76, Hobart 7001, Australia.
authors.forename: Zbyněk
authors.initials: Z
authors.lastname: Malenovský
authors.affiliation: 1Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
authors.forename: Uwe
authors.initials: U
authors.lastname: Rascher
mesh_terms: D000064:Acclimatization; D001901:Botany; D002140:California; D002734:Chlorophyll / Q000378:metabolism*; D005858:Germany; D010788:Photosynthesis; D028223:Pinus / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism*; D029963:Quercus / Q000378:metabolism; D058998:Remote Sensing Technology; D012621:Seasons; D032384:Tilia / Q000378:metabolism; D014197:Trees / Q000378:metabolism*
chemical_list: D002734:Chlorophyll
keywords: LIFT; PAM; electron transport rate; fluorescence; photosynthesis, remote sensing