<div dir="ltr"><p style="margin:0px;font-size:10px;font-family:Times"> Postdoctoral position at University of Lorraine – INRA Nancy:</p>
<p style="margin:0px;font-size:10px;font-family:Times">Understanding and modelling climatic and edaphic controls of CO<span style="font-size:6.5px">2 </span>isofluxes in soil.</p>
<p style="margin:0px;font-size:10px;font-family:Times"> Department: The position is based at UMR 1137 Ecologie et Ecophysiologie Forestières (EEF) – Nancy</p>
<p style="margin:0px;font-size:10px;font-family:Times">(France). This department undertakes fundamental and applied research on forest, with strong expertise in</p>
<p style="margin:0px;font-size:10px;font-family:Times">ecophysiology and ecology, and belongs to the Cluster of Excellence ”ARBRE” at INRA and University of</p>
<p style="margin:0px;font-size:10px;font-family:Times">Lorraine.</p>
<p style="margin:0px;font-size:10px;font-family:Times"> Research team: Caroline Plain, Bernard Longdoz, Daniel Epron (scientific advisor)</p><p style="margin:0px;font-size:10px;font-family:Times"><br></p>
<p style="margin:0px;font-size:10px;font-family:Times"> Context: Forest ecosystem respiration is dominated by soil CO<span style="font-size:6.5px">2 </span>efflux (Granier et al. 2000), which come from</p>
<p style="margin:0px;font-size:10px;font-family:Times">different biological components (roots, microbes) mobilizing different sources of carbon (recent photosynthate,</p>
<p style="margin:0px;font-size:10px;font-family:Times">stored carbohydrates, root exudates, fresh and more or less stabilized organic matter) localized at different depths</p>
<p style="margin:0px;font-size:10px;font-family:Times">and thus under different environmental conditions (Epron 2009). Efflux is also the results of physical processes</p>
<p style="margin:0px;font-size:10px;font-family:Times">such as diffusion and advection depending on the vertical profile of soil CO<span style="font-size:6.5px">2</span>, soil texture and water content. Our</p>
<p style="margin:0px;font-size:10px;font-family:Times">understanding of these processes can be improved by measuring the carbon isotope composition of soil CO<span style="font-size:6.5px">2</span></p>
<p style="margin:0px;font-size:10px;font-family:Times">efflux and soil CO<span style="font-size:6.5px">2 </span>concentration in different layers at high frequency by laser spectrometry (Marron et al.,</p>
<p style="margin:0px;font-size:10px;font-family:Times">2009, Plain et al. 2009, Parent et al. 2013). Indeed, their variations reflect the temporal changes of photosynthetic</p>
<p style="margin:0px;font-size:10px;font-family:Times">and post-photosynthetic fractionation as well as changes in source contribution, and help to better characterize</p>
<p style="margin:0px;font-size:10px;font-family:Times">the influence of climatic and edaphic conditions on (i) the vertical distribution of respiratory source, (ii) the</p>
<p style="margin:0px;font-size:10px;font-family:Times">intensity of CO<span style="font-size:6.5px">2 </span>production and (iii) its transport through the soil profile up to the atmosphere. We have recently</p>
<p style="margin:0px;font-size:10px;font-family:Times">collaborated to the development of a flux-gradient based model that predicted the vertical distribution and the</p>
<p style="margin:0px;font-size:10px;font-family:Times">diurnal variations of the production and isotope composition of soil CO<span style="font-size:6.5px">2 </span>(Goffin et al. 2014).</p><p style="margin:0px;font-size:10px;font-family:Times">
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<p style="margin:0px;font-size:10px;font-family:Times">Published papers from the team related to the project</p>
<p style="margin:0px;font-size:10px;font-family:Times">Epron, D. 2009. Chapter 8: Separating autotrophic and heterotrophic components of soil respiration: lessons</p>
<p style="margin:0px;font-size:10px;font-family:Times">learned from trenching and related root exclusion experiments. In Soil Carbon Dynamics: an Integrated</p>
<p style="margin:0px;font-size:10px;font-family:Times">Methodology Eds. W. Kutsch, M. Bahn and A. Heinemeyer. Cambridge University Press, pp. 157-168.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Goffin, S., M. Aubinet, M. Maier, C. Plain, H. Schack-Kirchner and B. Longdoz 2014. Characterization of the</p>
<p style="margin:0px;font-size:10px;font-family:Times">soil CO2 production and its carbon isotope composition in forest soil layers using the flux-gradient approach.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Agric. For. Meteorol. 188:45-57.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Granier, A., et al. 2000. The carbon balance of a young beech forest. Funct. Ecol. 14:312-325.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Maier, M., H. Schack-Kirchner, M. Aubinet, S. Goffin, B. Longdoz, F. Parent. 2012 Turbulence effect on gas</p>
<p style="margin:0px;font-size:10px;font-family:Times">transport in three contrasting forest soils Soil Sci. Soc. Am. J. 76: 1518–1528</p>
<p style="margin:0px;font-size:10px;font-family:Times">Marron, N., C. Plain, B. Longdoz and D. Epron 2009. Seasonal and daily time course of the 13C composition in</p>
<p style="margin:0px;font-size:10px;font-family:Times">soil CO2 efflux recorded with a tunable diode laser spectrophotometer (TDLS). Plant Soil. 318:137-151.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Parent, F., C. Plain, D. Epron, M. Maier and B. Longdoz 2013. A new method for continuously measuring the</p>
<p style="margin:0px;font-size:10px;font-family:Times"><span style="font-family:Helvetica"><b>δ</b></span>13C of soil CO2 concentrations at different depths by laser spectrometry. Eur. J. Soil Sci. 64:516–525.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Plain, C., D. Gérant, P. Maillard, M. Dannoura, Y. Dong, B. Zeller, P. Priault, F. Parent and D. Epron 2009.</p>
<p style="margin:0px;font-size:10px;font-family:Times">Tracing of recently assimilated carbon in respiration at high temporal resolution in the field with a tuneable</p>
<p style="margin:0px;font-size:10px;font-family:Times">diode laser absorption spectrometer after in situ 13CO2 pulse labelling of 20-year-old beech trees. Tree</p>
<p style="margin:0px;font-size:10px;font-family:Times">Physiol. 29:1433-1447.</p><p style="margin:0px;font-size:10px;font-family:Times"><br></p>
<p style="margin:0px;font-size:10px;font-family:Times"> Duties: We are seeking a young researcher who will be in charge of understanding the interplay between</p>
<p style="margin:0px;font-size:10px;font-family:Times">production and transport of <span style="font-size:6.5px">13</span>CO<span style="font-size:6.5px">2 </span>and <span style="font-size:6.5px">12</span>CO<span style="font-size:6.5px">2 </span>in the soil and to analyze their temporal variability at different</p>
<p style="margin:0px;font-size:10px;font-family:Times">scales using the flux-gradient based model using a large available data set obtained in the Hesse experimental</p>
<p style="margin:0px;font-size:10px;font-family:Times">forest (vertical profile and fluxes of soil and trunk CO<span style="font-size:6.5px">2 </span>and <span style="font-family:Helvetica"><b>d</b></span><span style="font-size:6.5px">13</span>C-CO<span style="font-size:6.5px">2</span>, sapflow, <span style="font-family:Helvetica"><b>d</b></span><span style="font-size:6.5px">13</span>C of phloem sap and leaf and</p>
<p style="margin:0px;font-size:10px;font-family:Times">root soluble C as well as all the data available at this eddy covariance flux site).</p><p style="margin:0px;font-size:10px;font-family:Times"><br></p>
<p style="margin:0px;font-size:10px;font-family:Times"> Qualifications: Qualified candidate should be highly motivated and have a PhD degree in Biology or in Soil</p>
<p style="margin:0px;font-size:10px;font-family:Times">science with good skills in physics and modelling. Knowledge in stable isotope and forest/agricultural ecosystem</p>
<p style="margin:0px;font-size:10px;font-family:Times">functioning would be an advantage but they may be acquired during the first month. Oral and written English are</p>
<p style="margin:0px;font-size:10px;font-family:Times">required.</p><p style="margin:0px;font-size:10px;font-family:Times"><br></p>
<p style="margin:0px;font-size:10px;font-family:Times"> Duration: 12 months, starting Nov 2014 (no later than Dec 1<span style="font-size:6.5px">st</span>, 2014).</p><p style="margin:0px;font-size:10px;font-family:Times">
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<p style="margin:0px;font-size:10px;font-family:Times"> How to apply? Applicants should submit a CV including a publication list and a short description of previous</p>
<p style="margin:0px;font-size:10px;font-family:Times">research, current research interests and other activities of relevance for the position to Daniel Epron</p>
<p style="margin:0px;font-size:10px;font-family:Times">(<span style="color:rgb(4,51,255)"><a href="mailto:daniel.epron@univ-lorraine.fr">daniel.epron@univ-lorraine.fr</a></span>). Telephone numbers and e-mail addresses of up to three references should be</p>
<p style="margin:0px;font-size:10px;font-family:Times">given. Applications will be accepted until the position is filled.</p>
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