% IMPORTANT: The following is UTF-8 encoded. This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.
@BOOK{Schickling:20447,
author = {Schickling, Anke},
title = {{R}emote sensing of sun-induced fluorescence for improved
modeling of gross primary productivity in a heterogeneous
agricultural area},
volume = {134},
school = {Universität Köln},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {PreJuSER-20447},
isbn = {978-3-89336-775-7},
series = {Schriften des Forschungszentrums Jülich : Energie $\&$
Umwelt / Energy $\&$ Environment},
year = {2012},
note = {Record converted from VDB: 12.11.2012; Universität Köln,
Diss., 2011},
abstract = {Gross primary productivity (GPP) is an important parameter
to quantify carbon fixation by plant ecosystems. To
determine GPP at different spatial scales, remote sensing
(RS) offers the unique possibility to provide information
from local to global scales. Attempts to estimate GPP from
RS data focus on the light-use efficiency (LUE) concept of
Monteith that relates GPP to the absorbed photosynthetically
active radiation and the efficiency of plant canopies to
utilize the absorbed radiation for photosynthesis. To
reliably predict GPP at different spatio-temporal scales,
LUE has to be linked to optical remote sensing parameters
that detect variations in photosynthetic efficiency as a
result of changes in environmental conditions. In this study
two optical remote sensing parameters were investigated for
their potential to serve as a proxy for LUE: the sun-induced
fluorescence yield derived from the oxygen absorption
O$_{2}$-A band at 760 nm (Fs$_{760}$-yield) and the
photochemical reflectance index (PRI). Both parameters were
derived from two ASD FieldSpec spectrometers that were
operated in parallel, one above the vegetation canopy of
either a winter wheat or a sugar beet field and one from a
small research aircraft. Based on the LUE concept of
Monteith GPP was calculated on a diurnal basis including
optical parameters derived from ground observations and
compared to simultaneously acquired GPP data from the eddy
covariance method. The results showed that the diurnal
response of physiological regulation of photosynthesis to
changing environmental conditions could be tracked reliably
with the Fs$_{760}$-yield or a combination of the
Fs760-yield and the PRI. Moreover, the airborne observations
were used to characterize the spatial variations of
Fs$_{760}$-yield, PRI and GPP of different fields at a
regional observation site over the course of a day. Results
of this spatio-temporal investigation revealed a significant
variability of GPP between different winter wheat fields
compared to the within-field variability. For sugar beet the
results also showed an increase of the within-field
variability in the afternoon in addition to the significant
between-field variability. It could be shown that optical RS
parameters are sufficiently sensitive to detect a reduction
of photosynthetic CO$_{2}$ uptake due to stomatal closure.
In the sugar beet canopy this regulation of photosynthesis
caused a reduction of GPP in the afternoon ranging from 25
\% to 33 \% in comparison to maximum GPP values in the
morning.},
cin = {IEK-8},
ddc = {333.7},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {Atmosphäre und Klima},
pid = {G:(DE-Juel1)FUEK491},
typ = {PUB:(DE-HGF)3},
url = {https://juser.fz-juelich.de/record/20447},
}