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000872668 037__ $$aFZJ-2020-00159
000872668 041__ $$aEnglish
000872668 1001_ $$0P:(DE-Juel1)178852$$aBusch, Carsten$$b0$$eCorresponding author
000872668 245__ $$aUntersuchungen von nicht-destruktiven Verfahren zur Messung von  Kohlenstoffakkumulation in Pflanzen: Sonneninduzierte Chlorophyllfluoreszenz und Eddy-Kovarianz$$f - 2020-12-17
000872668 260__ $$c2019
000872668 300__ $$a91 p.
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000872668 3367_ $$2BibTeX$$aMASTERSTHESIS
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000872668 502__ $$aMasterarbeit, Köln, 2019$$bMasterarbeit$$cKöln$$d2019$$o2020-12-17
000872668 520__ $$aVegetation drives 90 % of the gas exchange between biosphere and atmosphere resulting in the dependency of vital vegetation for stable gas concentrations in the atmosphere. The commonly used method for measuring gas fluxes is eddy covariance (EC), which measures the difference between incoming and outcoming gas and specifies these measurements on a source region called footprint. Another method for quantifying gas fluxes is sun-induced chlorophyll fluorescence (SIF), which is an electromagnetic signal in a spectral region between 640 and 800 nm emitted by plants during photosynthesis. SIF correlates strongly with the photosynthetic efficiency and therefore with the assimilation of carbon. In  the  following  thesis  a  new  method  for  linking  SIF  with  gross  primary  production  (GPP)  is postulated.  The  Method  uses  the  EC-Footprint  for  spatially  weighting  SIF  and  GPP.  The  used footprints were subsequently divided in different percentages. The aim of this thesis is the analysis of  the  correlation  between  SIF and  GPP  regarding  the  use of  different  percentages of  the  EC footprint.   Hyperspectral scenes were taken with the sensor HyPlant on four days during summer of 2018. With these scenes SIF can be estimated due to the iFLD method which uses two oxygen absorption bands at 678 and 760 nm. Two additional SIF products were considered: F Ratio  describes the ratio between the estimated F 687  and F 760 . F tot  is characterized by the total Fluorescence of the entire emission spectrum. GPP were estimated with the measured net ecosystem exchange (NEE) by the method of REICHSTEIN et al. (2005). The estimation of the footprints was calculated by the method of KORMANN & MEIXNER (2001). A script written in python spatially matched and read the different data sets. Afterwards the script exported values of GPP and SIF for different percentages of the footprint, which were used to calculate the coefficient of determination per percentage per statio per SIF product.  The results show a strong correlation with the use of small percentages of the footprint for the northern station, while the southern and both stations combined show no or small correlation in all  percentages  of  the  footprint.  The  extent  of  the  fields  could  play  an  important  role  in  the calculations  due  to  the  larger  extent  of  the  footprints.  Higher  percentages  overlap  the  fields boundaries and therefore bordering plant species could manipulate the results. However, the results of the northern station show a possible use of the method for future investigations.
000872668 536__ $$0G:(DE-HGF)POF3-582$$a582 - Plant Science (POF3-582)$$cPOF3-582$$fPOF III$$x0
000872668 7001_ $$0P:(DE-Juel1)172754$$aKrieger, Vera$$b1$$eThesis advisor
000872668 7001_ $$0P:(DE-Juel1)129388$$aRascher, Uwe$$b2$$eThesis advisor
000872668 8564_ $$uhttps://juser.fz-juelich.de/record/872668/files/Busch_Carsten_Masterarbeit_2019.pdf$$yOpenAccess
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