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000202655 0247_ $$2Handle$$a2128/9009
000202655 0247_ $$2ISSN$$a1866-1793
000202655 020__ $$a978-3-95806-061-6
000202655 037__ $$aFZJ-2015-04845
000202655 041__ $$aEnglish
000202655 1001_ $$0P:(DE-Juel1)144570$$aGangi, Laura$$b0$$eCorresponding author$$gfemale$$ufzj
000202655 245__ $$aReal-time quantification of oxygen isotope exchange between carbon dioxide and leaf /soil water in terrestrial ecosystems with laser-based spectroscopy$$f2015-05-31
000202655 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2015
000202655 300__ $$aXX, 156 S.
000202655 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1438323490_1376
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000202655 3367_ $$2ORCID$$aDISSERTATION
000202655 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v266
000202655 502__ $$aUniversität Bonn, Diss., 2015$$bDr.$$cUniversität Bonn$$d2015
000202655 520__ $$aThe oxygen isotope ratio of atmospheric carbon dioxide ($\delta^{18}$O-CO$_{2}$) can be used to partition thegross fluxes of CO$_{2}$ in terrestrial ecosystems, such as soil respiration and plant assimilation, asa characteristic $\delta^{18}$O value is transferred to CO$_{2}$ during isotopic equilibration with differentwater pools. However, the quantitative use of $\delta^{18}$O-CO$_{2}$ requires a detailed understanding of the different processes and factors that influence the CO$_{2}$–H$_{2}$O oxygen isotope exchange atdifferent scales. The effect of varying environmental conditions on the $^{18}$O-exchange between atmospheric CO$_{2}$ and the leaf water of different plant species has been insufficiently explored in experiments, and also the $\delta^{18}$O of soil efflux is fraught with uncertainty due to the complex influence of soil water content (SWC), soil texture and tortuosity, as well as the catalytic activity of the enzyme carbonic anhydrase (CA). The aim of the present study was to elucidate the $^{18}$O-exchange between CO$_{2}$ and leaf/soil water under controlled laboratory conditions and at a hightemporal resolution. For this purpose, $\delta^{18}$O of CO$_{2}$ and water vapor were measured online using infrared laser spectroscopy in plant chamber experiments with spruce, wheat, poplar and maize, as well as soil column experiments, which included the use of gas-permeable tubing. Finally, the biophysical soil–vegetation–atmosphere model MuSICA was applied to simulate the $^{18}$O-exchange at the ecosystem level and to test whether a value for the degree of isotopic equilibrium ($\theta$) obtained from plant chamber experiments was suitable for model parameterization. [...]
000202655 536__ $$0G:(DE-HGF)POF3-255$$a255 - Terrestrial Systems: From Observation to Prediction (POF3-255)$$cPOF3-255$$fPOF III$$x0
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