Publikationen Werner

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Originalarbeiten in wissenschaftlichen Fachzeitschriften

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2019

• Dubbert M, Caldeira M C, Dubbert D, Werner C
  A pool-weighted perspective on the two-water-worlds hypothesis
  2019 New Phytol
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  Kurzfassung

  The ‘two‐water‐worlds’ hypothesis is based on stable isotope differences in stream, soil and xylem waters in dual isotope space. It postulates no connectivity between bound and mobile soil waters, and preferential plant‐water‐uptake of bound soil water sources. We tested the pool‐weighted impact of isotopically distinct water pools for hydrological cycling, the influence of species‐specific water use and the degree of ecohydrological separation. We combined stable isotope analysis (δ18O and δ2H) of ecosystem water pools of precipitation, groundwater, soil and xylem water of two distinct species (Quercus suber, Cistus ladanifer) with observations of soil water contents and sap flow. Shallow soil water was evaporatively enriched during dry‐down periods, but enrichment faded strongly with depth and upon precipitation events. Despite clearly distinct water sources and water‐use strategies, both species displayed a highly opportunistic root‐water‐uptake pattern. Here we offer an alternative explanation, showing that the isotopic differences between soil and plant water vs groundwater can be fully explained by spatio‐temporal dynamics. Pool weighting the contribution of evaporatively enriched soil water reveals only minor annual impacts of these sources to ecosystem water cycling (c. 11% of bulk soil water and c. 14% of transpired water).
• Nogueira C, Werner C, Rodrigues A, Caldeira M C
  A prolonged dry season and nitrogen deposition interactively affect CO2 fluxes in an annual Mediterranean grassland.
  2019 Stoten, Science of the Total Environment, Band: 654, Seiten: 978 - 986
• Knauer J,, Zaehle S,, De Kauwe M,, Bahar Nur H.A., Evans J R,, Medlyn B E,, Reichstein M,, Werner C
  Exploring the effects of mesophyll conductance on vegetation responses to elevated CO2 concentrations in a land surface model.
  2019 Global Change Biol
• Vetter V, Walter J, Buhk C, Braun M, Clemens S, Dinkel E, Schramm A, Dubbert M, Wegener F, Werner C, Jentsch A
  Invasion windows for a global legume invader are revealed after joint examination of abiotic and biotic filters.
  2019 Plant Biology
• Kuebert A, Goetz M, Kuester E, Piayda A, Rothfuss Y, Werner C, Dubbert M
  Nitrogen Loading Enhances Stress Impact of Drought on a Semi-natural Temperate Grassland
  2019 Front Plant Sci, Band: 10, Seiten: 1 - 16
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  Kurzfassung

  Two important threats to the sustainable functioning of seminatural grasslands in temperate zones are (1) nutrient loading due to agricultural fertilization and pollution, and (2) the increase of extreme drought events due to climate change. These threats may cause substantial shifts in species diversity and abundance and considerably affect the carbon and water balance of ecosystems. The synergistic effects between those two threats, however, can be complex and are poorly understood. Here, we experimentally investigated the effects of nitrogen addition and extreme drought (separately and in combination) on a seminatural temperate grassland, located in Freiburg (South Germany). To study the grassland response, we combined eddy-covariance techniques with open gas exchange systems. Open gas exchange chambers were connected to an infrared gas analyzer and water isotope spectrometer, which allowed the partitioning of net ecosystem exchange and evapotranspiration. Vegetation parameters were described by species richness, species abundance, and leaf area index. Our results suggest that grassland communities, strongly weakened in their stress response by nitrogen loading, can substantially lose their carbon sink function during drought. While nitrogen addition caused a significant loss in forb species (−25%), precipitation reduction promoted a strong dominance of grass species at season start. Consequently, the grass-dominated and species-poor community suffered from a strong above-ground dieback during the dry summer months, likely caused by lower water use efficiency and weaker drought adaptations of the species community. Over the growing season (April-September), the carbon sequestration of the studied grassland was reduced by more than 60% as a consequence of nitrogen addition. Nitrogen addition in combination with precipitation reduction decreased carbon sequestration by 73%. Eutrophication can severely threaten the resilient functioning of grasslands, in particular when drought periods will increase as predicted by future climate scenarios. Our findings emphasize the importance of preserving high diversity of grasslands to strengthen their resistance against extreme events such as droughts.
• Sprenger M, Stumpp C, Weiler M, Aeschbach W, Allen S T, Benettin P, Dubbert M, Hartmann A, Hrachowitz M, Kirchner J W, McDonnell J J, Orlowski N, Penna d, Pfahl S, Rinderer M, Rodriguez N, Schmidt M, Werner C
  The demographics of water: A review of water ages in the critical zone.
  2019 Rev Geophys
• Dubbert M,, Werner C
  Water fluxes mediated by vegetation: Emerging insights at the soil and atmosphere interfaces.
  2019 New Phytol, Band: 221, Seiten: 1754 - 1763

2018

• Fasbender Lukas, Yáñez-Serrano Ana Maria, Jürgen Kreuzwieser, David Dubbert, Werner Christiane
  A novel approach combining PTR-TOF-MS, 13CO2 laser spectroscopy and 13C-metabolite labelling to trace real-time carbon allocation into biogenic volatile organic compounds (BVOCs) and respiratory carbon dioxide (CO2).
  2018 Plos One, Band: 13: e0204398
• Nogueira C, Werner C, Rodrigues A, Caldeira M C
  A prolonged dry season and nitrogen deposition interactively affect CO2 fluxes in an annual Mediterranean grassland. Stoten, Science of the Total Environment.
  2018 Sci Total Environ, Band: 654, Seiten: 978 - 986
• Große-Stoltenberg A, Hellmann C, Thiele J, Werner C, Oldeland J
  Early detection of GPP-related regime shifts after plant invasion by integrating imaging spectroscopy with airborne LiDAR. , 209: 780–792.
  2018 Remote Sens Environ, Band: 209, Seiten: 780 - 792
• Henry H, Abedi M, Alados C, Beard K, Fraser L, Jentsch A, Kreyling J, Kulmatiski A, Lamb E, Sun W, Vankoughnett M, Werner C, Beil I, Blindow I, Dahlke S, Dubbert M, Effinger A, Garris H, Gartzia M, Gebauer T, Abu Sayed Arfin Khan M, Maleyshev A, Morgan J, Nock C, Paulson J, Pueyo Y, Stover H, Yang X
  Increased Soil Frost Versus Summer Drought as Drivers of Plant Biomass Responses to Reduced Precipitation: Results from a Globally Coordinated Field Experiment
  2018 Ecosystems
• Orlowski N, Breuer L, Angeli N, Boeckx P, Brumbt C, Cook C, Dubbert M, Dyckmans J, Gallagher B, Gralher B, Herbstritt B, Hervé Fernandez P, Hissler C, Koeninger P, Legout A, Macdonald C, Oyarzun C, Redelstein R, Seidler C, Siegwolf RTW, Stumpp C, Thomsen S, Weiler M, Werner C, McDonell JJ
  Inter-laboratory comparison of cryogenic water extraction systems for stable isotope analysis of soil water
  2018 Hydrol Earth Syst Sc discuss
• Große-Stoltenberg A, Hellmann C, Thiele J, Oldeland J, Werner C
  Invasive acacias differ from native dune species in the hyperspectral/ biochemical trait space. Journal of Vegetation Science.
  2018 J Veg Sci
• Craine J M, Elmore A J, Wang L, Aranibar J, Bauters M, Boeckx P, Crowley B E, Dawes M A, Delzon S, Fajardo A, Fang Y, Fujiyoshi L, Gray A, Guerrieri R, Gundale M J, Hawke D J, Hietz P, Jonard M, Kearsley E, Kenzo T, Makarov M, Marañón-Jiménez S, McGlynn T P, McNeil B E, Mosher S G, Nelson D M, Peri P L, Roggy J C, Sanders-DeMott R, Song M, Szpak P, Templer P H, Colff D V d, Werner C, Xu X, Yang Y, Yu G, Zmudczyńska-Skarbek K
  Isotopic evidence for oligotrophication of terrestrial ecosystems.
  2018 Nat Ecol Evol, Band: 2, Seite: 1735
• NayHtoon B, Xue W, Lindner S, Cuntz M, Ko J, Tenhunen J, Werner C, Dubbert M
  Quantifying differences in water and carbon cycling between paddy and rainfed rice (Oryza sativa L.) by flux partitioning
  2018 Plos One
• Haberstroh S,, Kreuzwieser J,, Lobo-do-Vale R,, Caldeira M C,, Dubbert M,, Werner C
  Terpenoid emissions of two Mediterranean woody species in response to drought stress.
  2018 Front Plant Sci, Band: 9, Seite: 1071
• Knauer J, Zaehle S, Medlyn B, Reichstein M, Williams C, Migliavacca M, De Kauwe M, Werner C, Keitel C, Kolari P, Limousin J-M, Linderson M-L
  Towards physiologically meaningful water-use efficiency estimates from eddy covariance data.
  2018 Global Change Biol, Band: 24, Seiten: 694 - 710
• Yáñez-Serrano A. M., L. Fasbender, J. Kreuzwieser, D. Dubbert, S. Haberstroh, R. Lobo-do-Vale, M. C. Caldeira, C. Werner
  Volatile diterpene emission by two Mediterranean Cistaceae shrubs. DOI:10.1038/s41598-018-25056-w
  2018 Sci Rep-uk, Band: 8:6855

2017

• Xue X, Jonghan K, Werner C, Tenhunen J
  A spatially hierarchical integration of close-range remote sensing, leaf structure and physiology assists in diagnosing spatiotemporal dimensions of field-scale ecosystem photosynthetic productivity.
  2017 Agricultural and Forest Meteorology, Band: 247, Seiten: 503 - 519
• Hellmann C, Grosse-Stoltenberg A, Thiele J, Oldeland J, Werner C
  Heterogeneous environments shape invader impacts: integrating environmental, structural and functional effects by isoscapes and remote sensing.
  2017 Sci Rep-uk, Band: 7, Nummer: 1, Seiten: 4118 - 4118
• Dubbert M, Kübert A, Werner C
  Impact of leaf traits on temporal dynamics of transpired oxygen isotope signatures and its impact on atmospheric vapor
  2017 Front Plant Sci
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  Kurzfassung

  Oxygen isotope signatures of transpiration (δE) are powerful tracers of water movement from plant to global scale. However, a mechanistic understanding of how leaf morphological/ physiological traits effect δE is missing. A laser spectrometer was coupled to a leaf-level gas-exchange system to measure fluxes and isotopic signatures of plant transpiration under controlled conditions in seven distinct species (Fagus sylvatica, Pinus sylvestris, Acacia longifolia, Quercus suber, Coffea arabica, Plantago lanceolata, Oxalis triangularis). We analyzed the role of stomatal conductance (gs) and leaf water content (W) on the temporal dynamics of δE following changes in relative humidity (rH). Changes in rH were applied from 60 to 30 % and from 30 to 60 %, which is probably more than covering the maximum step changes occurring under natural conditions. Further, the impact of gs and W on isotopic non-steady state Isofluxes was analyzed. Following changes in rH, temporal development of δE was well described by a one-pool modelling approach for most species. Isofluxes of δE were dominantly driven by stomatal control on E, particularly for the initial period of 30 min following a step change. Hence, the deviation of isofluxes from isotopic steady state can be large, even though plants transpire near to isotopic steady state. Notably, not only transpiration rate and stomatal conductance, but also the leaf traits stomatal density (as a measure of gmax) and leaf water content are significantly related to the time constant (τ) and non-steady-state isofluxes. This might provide an easy-to-access means of a priori assumptions for the impact of isotopic non-steady-state transpiration in various ecosystems. We discuss the implications of our results from leaf to ecosystem scale.
• Piayda, A, Dubbert M, Siegwolf R T W, Cuntz M, Werner C
  Quantification of dynamic soil – vegetation feedbacks following an isotopically labelled precipitation pulse
  2017 Biogeosciences
• Wei X, Lindner S, Dubbert M, Otieno D, Ko J, Muraoka H, Werner C, Tenhunen J
  Supplement understanding of the relative importance of biophysical factors in determination of photosynthetic capacity and photosynthetic productivity in rice ecosystems
  2017 Agricultural and Forest Meteorology, Band: 232, Seiten: 550 - 565
• Fasbender L, Maurer D, Kreuzwieser J, Kreuzer I, Schulze WX, Kruse J, Becker D, Alfarraj S, Hedrich R, Werner C, Rennenberg H
  The carnivorous Venus flytrap uses prey-derived amino acid carbon to fuel respiration.
  2017 New Phytol
• Knauer J, Zaehle S, Medlyn BE, Reichstein M, Williams CA, Migliavacca M, De Kauwe MG, Werner C, Keitel C, Kolari P, Limousin JM, Linderson ML
  Towards physiologically meaningful water-use efficiency estimates from eddy covariance data.
  2017 Glob Change Biol

2016

• Hellmann C, Werner C, Oldeland J
  A Spatially Explicit Dual-Isotope Approach to Map Regions of Plant-Plant Interaction after Exotic Plant Invasion.
  2016 Plos One, Band: 11, Nummer: 7, Seiten: e0159403 - e0159403
• Lehmann MM, Wegener F, Werner RA, Werner C
  Diel variations in carbon isotopic composition and concentration of organic acids and their impact on plant dark respiration in different species.
  2016 Plant Biology, Band: 18, Nummer: 5, Seiten: 776 - 784
• Grosse-Stoltenberg Andre, Hellmann Christine, Werner Christiane, Oldeland Jens, Thiele Jan
  Evaluation of Continuous VNIR-SWIR Spectra versus Narrowband Hyperspectral Indices to Discriminate the Invasive Acacia longifolia within a Mediterranean Dune Ecosystem
  2016 POSTFACH, CH-4005 BASEL, SWITZERLAND REMOTE SENSING, MDPI AG, Band: 8, Nummer: 4
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  Kurzfassung

  Hyperspectral remote sensing is an effective tool to discriminate plant species, providing vast potential to trace plant invasions for ecological assessments. However, necessary baseline information for the use of remote sensing data is missing for many high-impact invaders. Furthermore, the identification of the suitable classification algorithms and spectral regions for successfully classifying species remains an open field of research. Here, we tested the separability of the invasive tree Acacia longifolia from adjacent exotic and native vegetation in a Natura 2000 protected Mediterranean dune ecosystem. We used continuous visible, near-infrared and short wave infrared (VNIR-SWIR) data as well as vegetation indices at the leaf and canopy level for classification, comparing five different classification algorithms. We were able to successfully distinguish A. longifolia from surrounding vegetation based on vegetation indices. At the leaf level, radial-basis function kernel Support Vector Machine (SVM) and Random Forest (RF) achieved both a high Sensitivity (SVM: 0.83, RF: 0.78) and a high Positive Predicted Value (PPV) (0.86, 0.83). At the canopy level, RF was the classifier with an optimal balance of Sensitivity (0.75) and PPV (0.75). The most relevant vegetation indices were linked to the biochemical parameters chlorophyll, water, nitrogen, and cellulose as well as vegetation cover, which is in line with biochemical and ecophysiological properties reported for A. longifolia. Our results highlight the potential to use remote sensing as a tool for an early detection of A. longifolia in Mediterranean coastal ecosystems.
• Hellmann C, Rascher KG, Oldeland J, Werner C
  Isoscapes resolve species-specific spatial patterns in plant-plant interactions in an invaded Mediterranean dune ecosystem.
  2016 Tree Physiol
• Lehmann MM, Wegener F, Barthel M, Maurino VG, Siegwolf RT, Buchmann N, Werner C, Werner RA
  Metabolic Fate of the Carboxyl Groups of Malate and Pyruvate and their Influence on delta(13)C of Leaf-Respired CO2 during Light Enhanced Dark Respiration.
  2016 Front Plant Sci, Band: 7, Seiten: 739 - 739
• Xue W, Lindner S, Nay-Htoon B, Dubbert M, Otieno D, Ko J, Muraoka H, Werner C, Tenhunen J, Harley P
  Nutritional and developmental influences on components of rice crop light use efficiency
  2016 Agricultural and Forest Meteorology, Band: 223, Seiten: 1 - 16
• Piayda A*, Dubbert M*, Siegwolf RTW, Cuntz M, Werner C
  Quantification of dynamic soil – vegetation feedbacks following an isotopically labelled precipitation pulse
  2016 Biogeosciences discussions
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  Kurzfassung

  Abstract. The presence of vegetation alters hydrological cycles of ecosystems. Complex plant – soil interactions govern the fate of precipitation input and water transitions through ecosystem compartments. Disentangling these interactions is a major challenge in the field of ecohydrology and pivotal foundation for understanding the carbon cycle of semi – arid ecosystems. Stable water isotopes can be used in this context as tracer to quantify water movement through soil – vegetation – atmosphere interfaces. The aim of this study is to disentangle vegetation effects on soil water infiltration and distribution as well as dynamics of soil evaporation and grassland water – use in a Mediterranean cork – oak woodland during dry conditions. An irrigation experiment using δ18O labeled water was carried out in order to quantify distinct effects of tree and herbaceous vegetation on infiltration and distribution of event water in the soil profile. Dynamic responses of soil and herbaceous vegetation fluxes to precipitation regarding event water – use, water uptake depth plasticity and contribution to ecosystem evapotranspiration were quantified. Total water loss to the atmosphere from bare soil was as high as from vegetated soil, utilizing large amounts of unproductive water loss for biomass production, carbon sequestration and nitrogen fixation. During the experiment no adjustments of main root water uptake depth to changes of water availability could be observed, rendering light to medium precipitation events under dry conditions useless. This forces understory plants to compete with adjacent trees for soil water in deeper soil layers. Thus understory plants are faster subject to chronic drought, leading to premature senescence at the onset of drought. Despite this water competition, the presence of Cork oak trees fosters infiltration to large degrees. That reduces drought stress, caused by evapotranspiration, due to favourable micro climatic conditions under tree crown shading. This study highlights complex soil – plant – atmosphere and inter – species interactions in both space and time controlling the fate of rain pulse transitions through a typical Mediterranean savannah ecosystem, disentangled by the use of stable water isotopes.
• Werner, C., Dubbert, M.
  Resolving rapid dynamics of soil-plant-atmosphere interactions
  2016 New Phytologist
• Xue W, Nay-Htoon B, Lindner S, Dubbert M, Otieno D, Ko J, Werner C, Tenhunen J
  Soil water availability and capacity of nitrogen accumulation influence variations of intrinsic water use efficiency in rice.
  2016 J Plant Physiol, Band: 193, Seiten: 26 - 36
• Knauer Jürgen, Zaehle Sönke, Reichstein Markus, Medlyn Belinda, Forkel Matthias, Hagemann Stefan, Werner Christiane
  The response of ecosystem water-use efficiency to rising atmospheric CO2 concentrations: Sensitivity and large-scale biogeochemical implications.
  2016 New Phytol

2015

• Heinrich S, Dippold MA, Werner C, Wiesenberg GL, Kuzyakov Y, Glaser B
  Allocation of freshly assimilated carbon into primary and secondary metabolites after in situ (1)(3)C pulse labelling of Norway spruce (Picea abies).
  2015 Tree Physiol, Band: 35, Nummer: 11, Seiten: 1176 - 1191
• Misztal PK, Hewitt CN, Wildt J, Blande JD, Eller AS, Fares S, Gentner DR, Gilman JB, Graus M, Greenberg J, Guenther AB, Hansel A, Harley P, Huang M, Jardine K, Karl T, Kaser L, Keutsch FN, Kiendler-Scharr A, Kleist E, Lerner BM, Li T, Mak J, Nolscher AC, Schnitzhofer R, Sinha V, Thornton B, Warneke C, Wegener F, Werner C, Williams J, Worton DR, Yassaa N, Goldstein AH
  Atmospheric benzenoid emissions from plants rival those from fossil fuels.
  2015 Sci Rep-uk, Band: 5, Seiten: 12064 - 12064
• Jeglinski JW, Wolf JB, Werner C, Costa DP, Trillmich F
  Differences in foraging ecology align with genetically divergent ecotypes of a highly mobile marine top predator.
  2015 Oecologia, Band: 179, Nummer: 4, Seiten: 1041 - 1052
• Wegener, Frederik, Beyschlag, Wolfram, Werner, Christiane
  Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios
  2015 Functional Plant Biology, Band: 42, Nummer: 7, Seite: 620–629
• Costa e Silva, F., Correia, A., Piayda, A., Dubbert, M., Rebmann, C., Cuntz, M., Werner, C., David, J., Pereira, J.S.
  Effects of extremely dry winter on net ecosystem carbon exchange and tree phenology at a cork oak woodland.
  2015 Agricultural and Forest Meteorology
• Knauer, Jürgen, Werner, Christiane, Zaehle, Söhnke
  Evaluating stomatal models and their atmospheric drought response in a land surface scheme: a multi-biome analysis.
  2015 J Geophys Res
• Brewitt, Katrin, Pinol, J., Werner, Christiane, Beyschlag, Wolfram, Espadaler, X., Perez, N., Platner, Christian
  Evaluating the importance of trophobiosis in a Mediterranean ant community: a stable isotope analysis
  2015 Journal for the Study of social Arthropods
• Wegener F, Beyschlag W, Werner C
  High intraspecific ability to adjust both carbon uptake and allocation under light and nutrient reduction in Halimium halimifolium L.
  2015 Front Plant Sci, Band: 6, Seiten: 609 - 609
• Piayda, A., Dubbert, M., Werner, C., Correia, A.V., Pereira, J. S., Cuntz, M.
  Influence of woody tissue and leaf clumping on vertically resolved leaf area index and angular gap probability estimates
  2015 Forest Ecology and Management
• Kreyling, Jürgen, Schuerings, J., Malyshev, A., Vogt, L., Werner, Chrisitane, Jentsch, Anke
  Nitrogen leaching is enhanced after a winter warm spell but mainly controlled by vegetation composition in temperate zone mesocosms
  2015 Plant Soil
• Hellmann C, Grosse-Stoltenberg A, Laustro V, Oldeland J, Werner C
  Retrieving nitrogen isotopic signatures from fresh leaf reflectance spectra: disentangling delta(15)N from biochemical and structural leaf properties.
  2015 Front Plant Sci, Band: 6, Seiten: 307 - 307
• Höpfner, Ingo, Beyschlag, Wolfram, Bartelheimer, Maik, Werner, Christiane, Unger, Stephan
  Role of mycorrhization and nutrient availability in competitive interactions between the grassland species Plantago lanceolata and Hieracium pilosella
  2015 Plant Ecol
• Caldeira MC, Lecomte X, David TS, Pinto JG, Bugalho MN, Werner C
  Synergy of extreme drought and shrub invasion reduce ecosystem functioning and resilience in water-limited climates.
  2015 Sci Rep-uk, Band: 5, Seiten: 15110 - 15110

2014

• Piayda, A., Dubbert, M., Rebmann, C., Kolle, O., Costa e Silva, F., Correia, A., Pereira, J. S., Werner, C., Cuntz, M.
  Drought impact on carbon and water cycling in a Mediterranean Quercus suber L. woodland during the extreme drought event in 2012
  2014 Biogeosciences
• Dubbert, M., Mosena, A., Piayda, A., Cuntz, M., Correia, A., Pereira, J. S., Werner, C.,
  Influence of tree cover on herbaceous layer development and carbon and water fluxes in a Portuguese cork oak woodland
  2014 Acta Oecologica-International Journal of Ecology
• Dubbert, M., Cuntz, M., Piayda, A., Werner, C.
  Oxygen isotope signatures of transpired water vapor – the role of isotopic non-steady-state transpiration under natural conditions
  2014 New Phytologist
• Jardine, Kolby, Wegener, Frederik, Abrell, Leif, van Haren, Joost, Werner, Christiane
  Phytogenic biosynthesis and emission of methyl acetate
  2014 Plant Cell and Environment, Band: 37, Nummer: 2, Seiten: 414 - 424
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  Acetylation of plant metabolites fundamentally changes their volatility, solubility and activity as semiochemicals. Here we present a new technique termed dynamic C-13-pulse chasing to track the fate of C1-3 carbon atoms of pyruvate into the biosynthesis and emission of methyl acetate (MA) and CO2. C-13-labelling of MA and CO2 branch emissions respond within minutes to changes in C-13-positionally labelled pyruvate solutions fed through the transpiration stream. Strong C-13-labelling of MA emissions occurred only under pyruvate-2-C-13 and pyruvate-2,3-C-13 feeding, but not pyruvate-1-C-13 feeding. In contrast, strong (CO2)-C-13 emissions were only observed under pyruvate-1-C-13 feeding. These results demonstrate that MA (and other volatile and non-volatile metabolites) derive from the C-2,C-3 atoms of pyruvate while the C-1 atom undergoes decarboxylation. The latter is a non-mitochondrial source of CO2 in the light generally not considered in studies of CO2 sources and sinks. Within a tropical rainforest mesocosm, we also observed atmospheric concentrations of MA up to 0.6 ppbv that tracked light and temperature conditions. Moreover, signals partially attributed to MA were observed in ambient air within and above a tropical rainforest in the Amazon. Our study highlights the potential importance of acetyl coenzyme A (CoA) biosynthesis as a source of acetate esters and CO2 to the atmosphere.
• Dubbert M, Piayda A, Cuntz M, Correia AC, Costa E Silva F, Pereira JS, Werner C
  Stable oxygen isotope and flux partitioning demonstrates understory of an oak savanna contributes up to half of ecosystem carbon and water exchange.
  2014 Front Plant Sci, Band: 5, Seiten: 530 - 530

2013

• Dubbert, M., Cuntz, M., Piayda, A., Maguas, C., Werner, C.
  Partitioning evapotranspiration - Testing the Craing and Gordon model with field measurements of oxygen isotope ratios of evaporative fluxes
  2013 Journal of Hydrology, Band: 496, Nummer: 142, Seite: 153
• Jeglinski JW, Goetz KT, Werner C, Costa DP, Trillmich F
  Same size-same niche? Foraging niche separation between sympatric juvenile Galapagos sea lions and adult Galapagos fur seals.
  2013 J Anim Ecol, Band: 82, Nummer: 3, Seiten: 694 - 706

2012

• Jeglinski, Jana W., Werner, Christiane, Robinson, Patrick W., Costa, Daniel P., Trillmich, Fritz
  Age, body mass and environmental variation shape the foraging ontogeny of Galapagos sea lions
  2012 Marine Ecology-Progress Series, Band: 453, Seiten: 279 - 296
• Rascher, Katherine G., Hellmann, Christine, M guas, Cristina, Werner, Christiane
  Community scale 15N isoscapes: tracing the spatial impact of an exotic N2-fixing invader
  2012 Ecology Letters, Band: 15, Seiten: 484 - 491
• Jardine, Kolby, Barron-Gafford, Greg, Norman, L., Abrell, Leif, Monson, R.K., Meyers, K.T., Pavao-Zuckerman, M., Dontsova, K., Kleist, E., Werner, Christiane, Huxman, Travor
  Green leaf volatiles and oxygenated metabolite emission bursts from mesquite branches following light-dark transitions.
  2012 Photosynth Res
• Unger, Stephan, Maguas, Cristina, Pereira, Joao, David, T., Werner, Christiane
  Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah.
  2012 Agr Forest Meteorol
• Werner, Christiane, Schnyder, Hans, Cuntz, Matthias, Keitel, Claudia, Zeeman, M., Dawson, Todd, Badeck, F., Brugnoli, E., Gashghaie, Jaleh, Grams, Thorsten, Kayler, Zackary, Lakatos, Michael, Lee, X., Maguas, Cristina, Ogee, Jerome, Rascher, K., Siegwolf, Rolf, Unger, Stephan, Welker, J., Wingate, Lisa, Gessler, Arthur
  Progress and challenges in using stable isotopes to trace plant carbon and water relations across scales.
  2012 Biogeosciences
• Dubbert M, Rascher KG, Werner C
  Species-specific differences in temporal and spatial variation in delta(13)C of plant carbon pools and dark-respired CO (2) under changing environmental conditions.
  2012 Photosynth Res, Band: 113, Nummer: 1-3, Seiten: 297 - 309

2011

• Rascher, K., Maguas, Cristina, Werner, Christiane
  Acacia invasion impacts vegetation structure and regeneration dynamics in open dunes and pine forests.
  2011 Biol Invasions
• Werner, C., Gessler, A.
  Diel variations in the carbon isotope composition of respired CO2 and associated carbon sources: a review of dynamics and mechanisms
  2011 Biogeosciences, Band: 8, Seiten: 2437 - 2459
• Stahl, Vanessa, Beyschlag, Wolfram, Werner, Christiane
  Dynamic niche sharing in dry acidic grasslands - a 15N labelling approach.
  2011 Plant Soil
• Kueffer C, Niinemets U, Drenovsky RE, Kattge J, Milberg P, Poorter H, Reich PB, Werner C, Westoby M, Wright IJ
  Fame, glory and neglect in meta-analyses.
  2011 Trends Ecol Evol, Band: 26, Nummer: 10, Seiten: 493 - 494
• Hellmann, Christine, Sutter, Rabea, Rascher, K., Maguas, Cristina, Werner, Christiane
  Influence of an exotic N2-fixing Acacia on community composition and N status of native Mediterranean species.
  2011 Acta Oecol
• M guas, C., Rascher, K., Martins-Lou‡Æo, A., Carvalho, P., Pinho, P., Ramos, M., Correia, O., Werner, C.
  Responses of woody species to spatial and temporal ground water changes in coastal sand dune systems
  2011 Biogeosciences, Band: 8, Seiten: 3823 - 3832
• Reyers, Mark, Krüger, A., Werner, Christiane, Pinto, Joaquim, Zacharias, S., Kerschgens, M.
  The Simulation of the Opposing Fluxes of Latent Heat and CO2 over Various Land-Use Types: Coupling a Gas Exchange Model to a Mesoscale Atmospheric Model.
  2011 Bound-lay Meteorol
• Rascher, K., Große-Stoltenberg, Andre, Maguas, Cristina, Werner, Christiane
  Understory invasion by Acacia longifolia alters the water balance and carbon gain of a Mediterranean pine forest.
  2011 Ecosystems

2010

• Werner, C., M guas, C.
  Carbon isotope discrimination as a tracer of functional traits in a Mediterranean maccia plant community
  2010 Functional Plant Biology
• Unger, S., M guas, C., Pereira, J. S., Aires, L. M., David, T. S., Werner, C.
  Disentangling drought-induced variation in ecosystem and soil respiration by stable isotope partitioning
  2010 Oecologia
• Werner, C.
  Do isotopic respiratory signals trace changes in metabolic fluxes?
  2010 New Phytologist
• Werner, C., Zumkier, U., Beyschlag, W., Maguas, C.
  High competitiveness of a resource demanding invasive acacia under low resource supply
  2010 Plant Ecology, Band: 206, Seiten: 83 - 96
• Rascher, K. G., M guas, C., Werner, C.
  On the use of phloem sap ë13C as an indicator of canopy carbon discrimination
  2010 Tree Physiology
• Unger, Stephan, Maguas, Cristina, Pereira, Joao, David, T., Werner, Christiane
  The influence of precipitation pulses on soil respiration – Assessing the “Birch Effect” by stable carbon isotopes.
  2010 Soil Biol Biochem
• Wegener, F., Beyschlag, W., Werner, C.
  The magnitude of diurnal variation in carbon isotopic composition of leaf dark respired CO2 correlates with the difference between delta C-13 of leaf and root material
  2010 Functional Plant Biology, Band: 37, Nummer: 9, Seiten: 849 - 858
  » Kurzfassung anzeigen« Kurzfassung verbergen
  Kurzfassung

  Spatial and temporal variations in delta C-13 of dark respired CO2 (delta C-13(res)) and total and water-soluble organic matter (WSOM) were analysed in four plant species. There was an increase in delta C-13(res) over the light period (measured 5 min after darkening) in leaves, whereas no distinct diurnal pattern was detected in roots. Furthermore, large differences in delta C-13(res) were found along the plant axis during day time. The amount of daily delta C-13(res) enrichment in leaves relative to the putative substrate (WSOM) varied largely between species (3.2-15.9%), probably due to different carbon allocation strategies. Positional pyruvate labelling was used to detect whether variations in delta C-13(res) were related to changes in the relative activity of pyruvate dehydrogenase (PDH) and Krebs cycle (KC). The results indicate that one reason for the increase in delta C-13(res) in leaves during daylight is an increasing carbon flux through the PDH relative to the KC. Labelling experiments revealed no clear diurnal variations in PDH and KC activity in roots. Further, we found new evidence that the fractionation process that leads to the diurnal delta C-13 increase in leaf dark respiration is related to the well known C-13 depletion of leaf material compared with heterotrophic tissues

2009

• Beyschlag, W., Hanisch, S., Friedrich, S., Jentsch, A., Werner, C.
  15N natural abundances during early and late succession in a middle-European dry acidic grassland
  2009 Plant Biology, Band: 11 , Seiten: 713 - 724
• Unger, S., M guas, C., Pereira, J. S., Aires, L. M., David, T. S., Werner, C.
  Partitioning carbon fluxes in a Mediterranean oak forest to disentangle changes in ecosystem sink strength during drought
  2009 Agricultural and Forest Meteorolog, Band: 149, Seiten: 949 - 961
• Priault, P., Wegener, F., Werner, C.
  Pronounced differences in diurnal variation of carbon isotope composition of leaf respired CO2 among functional groups
  2009 New Phytologist, Band: 181, Nummer: 2, Seiten: 400 - 412
  » Kurzfassung anzeigen« Kurzfassung verbergen
  Kurzfassung

  The first broad species survey of diurnal variation in carbon (C) isotope signatures of leaf dark-respired CO2 (delta C-13(res)) is presented here and functional differences and diurnal dynamics are linked to fractionation in different respiratory pathways, based on C-13-labelling experiments. delta C-13(res) was analysed with a rapid in-tube incubation technique in 16 species. A large diurnal increase in delta C-13(res) (4-8 parts per thousand) occurred in evergreen, slow-growing and aromatic species and correlated significantly with cumulative photosynthesis, whereas no variation occurred in herbaceous, fast-growing plants or temperate trees. The diurnal increase in delta C-13(res) declined almost proportionally to reductions in cumulative light and was reduced in growing compared with mature leaves. Pyruvate positional labelling provided direct evidence that functional groups differ in C allocation between respiratory pathways owing to different metabolic demands for growth, maintenance and secondary metabolism. Diurnal increase in C flux through pyruvate dehydrogenase (for investment in, for example, isoprene or aromatic compounds) combined with consistently low Krebs cycle activity resulted in pronounced increase in delta C-13(res) in evergreen and aromatic species. By contrast, fast growing herbs with high respiratory demand exhibited no diurnal changes since C was fully respired. Hence, diurnal delta C-13(res) pattern may provide information for C allocation in plants. New Phytologist (2009) 181: 400-412doi: 10.1111/j.1469-8137.2008.02665.x
• Werner, C., Wegener, F., Unger, S., Nogues, S., Priault, P.
  Short-term dynamics of isotopic composition of leaf-respired CO2 upon darkening: measurements and implications
  2009 Rapid Communications in Mass Spectrometry, Band: 23, Nummer: 16, Seiten: 2428 - 2438
• Rascher, K. G., Maguas, C., Correia, O., Werner, C.
  Tracing seasonal changes in water use of an invasive Acacia and a native pine in Southern Portugal by measurement of sap flow
  2009 Acta Horticultura

2007

• Werner, C., Hasenbein, N., Maia, R., Beyschlag, W., M guas, C.
  Evaluating high time-resolved changes in carbon isotope ratio of respired CO2 by a rapid in-tube incubation technique
  2007 Rapid Communications in Mass Spectrometry, Band: 21, Seiten: 1352 - 1360

2006

• Werner, C., Unger, S., Pereira, J. S., Maia, R., David, J. S., Kurz-Besson, C., David, J. S., Maguas, C.
  Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (ë13CR) in a Mediterranean oak woodland and linkage to environmental factors
  2006 New Phytologist, Band: 172, Seiten: 330 - 346

2005

• Peperkorn, R., Werner, C., Beyschlag, W.
  Phenotypic plasticity of an invasive acacia versus two native Mediterranean species
  2005 Functional Plant Biology, Band: 32, Seiten: 933 - 944

2004

• Clemente, A., Werner, Christiane, Maguas, Cristina, Cabral, M., Martins-Loucao, M., Correia, O.
  Restoration of a Limestone Quarry: Effect of Soil Amendments on the Establishment of Native Mediterranean Sclerophyllous Shrubs.
  2004 Restor Ecol

2002

• Werner, C., Correia, O., Beyschlag, W.
  Characteristic patterns of chronic and dynamic photoinhibition of different functional groups in a Mediterranean ecosystem
  2002 Functional Plant Biology, Band: 29, Seiten: 999 - 1011

2001

• Werner, C., Ryel, R. J., Correia, O., Beyschlag, W.
  Effects of photoinhibition on whole-plant carbon gain assessed with a photosynthesis model
  2001 Plant, Cell and Environment, Band: 24, Seiten: 27 - 40
• Werner, C., Correia, O. A., Ryel, R. J., Beyschlag, W.
  Structural and functional variability within the canopy and its relevance for carbon gain and stress avoidance
  2001 Acta Oecologica, Band: 22, Seiten: 1 - 10

1999

• Werner, C., Correia, O., Beyschlag, W.
  Two different strategies of Mediterranean macchia plants to avoid photoinhibitory damage by excessive radiation levels during summer drought
  1999 Acta Oecologica, Band: 20, Seiten: 15 - 23

1998

• Werner, C., Correia, O. A., Ryel, R. J., Beyschlag, W.
  Modelling whole-plant primary production of macchia species: assessing the effects of photoinhibition and foliage orientation
  1998 Revista de Biologia, Band: 16, Seiten: 247 - 257

1996

• Oliveira, G., Werner, C., Correia, O.
  Are ecophysiological responses influenced by crown position in cork-oak?
  1996 Annales des Sciences ForestiŠres, Band: 53, Seiten: 235 - 241
• Werner, C., Correia, O.
  Photoinhibition in cork-oak leaves under stress: influence of the bark-stripping on the chlorophyll fluorescence emission in Quercus suber L
  1996 Trees Structure and Function, Band: 10, Seiten: 288 - 292

1993

• Oliveira, G., Werner, C., Mertens, C., Correia, O.
  Influencia da la posicion de la copa sobre la fenologia y las relaciones hidricas del alcornoque ( Quercus suber L.)
  1993 Congresso florestal espanol, Band: 1, Seiten: 277 - 282

Buchbeiträge

 zurück zur Übersicht aller Publikationen

2015

• Dubbert, M., Werner, C.
  Auswirkungen des Klimawandels in mediterranen Ökosystemen
  In: Folgen des Klimawandels
  2015, , Band: 8, Seiten: 15 - 22,

2008

• Werner, C., Peperkorn, R., Maguas, C., Beyschlag, W.
  Competitive balance between the alien invasive Acacia longifolia and native mediterranean species
  In: Plant Invasions: Human perception, ecological impacts and management
  2008, Backhuys Publishers, Seiten: 261 - 275,

2007

• Werner, C., Unger, S., Pereira, J. S., Ghashghaie, J., M guas, C.
  Temporal dynamics in ë13C of ecosystem respiration in response to environmental changes
  In: Stable Isotopes as Indicators of Ecological Change
  2007, Elsevier Academic Press, Band: 1, Seiten: 193 - 210,

2001

• Unger, S., Werner, C., M guas, C.
  Evaluation of water use efficiency: the contribution of structural vs. functional adaptations to drought stress
  In: PS2001 Proceedings: 12th International Congress on Photosynthesis.
  2001, CSIRO Publishing,

2000

• Werner, C., Clemente, A. S., Correia, P. M., Lino, P., M guas, C., Correia, A. I., Correia, O.
  Restoration of disturbed areas in the Mediterranean - a case study in a limestone quarry
  In: Sustainable Land-Use in Deserts
  2000, Springer, Band: 1, Seiten: 368 - 376,

1998

• Werner, C., Correia, O., Ryel, R. J., Beyschlag, W.
  Evaluation of photoinhibition on single-leaf and whole-plant photosynthesis of mediterranean macchia species
  In: Photosynthesis: Mechanisms and Effects
  1998, Kluwer AcademicPublishers, Band: Vol. V, Seiten: 4011 - 4014,