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Found 9 results
Title [ Year(Asc)]
Filters: Author is Amelynck, Crist  [Clear All Filters]
2011
[Simpraga2011] Šimpraga, M., H. Verbeeck, M. Demarcke, É. Joó, O. Pokorska, C. Amelynck, N. Schoon, J. Dewulf, H. Van Langenhove, B. Heinesch, et al., "Clear link between drought stress, photosynthesis and biogenic volatile organic compounds in Fagus sylvatica L.", Atmospheric Environment, vol. 45, no. 30: Elsevier, pp. 5254–5259, 2011.
Link: http://www.sciencedirect.com/science/article/pii/S1352231011006996
Abstract
Direct plant stress sensing is the key for a quantitative understanding of drought stress effects on biogenic volatile organic compound (BVOC) emissions. A given level of drought stress might have a fundamentally different effect on the BVOC emissions of different plants. For the first time, we continuously quantified the level of drought stress in a young potted beech (Fagus sylvatica L.) with a linear variable displacement transducer (LVDT) installed at stem level in combination with simultaneous measurements of BVOC emissions and photosynthesis rates at leaf level. This continuous set of measurements allowed us to examine how beech alters its pattern of photosynthesis and carbon allocation to BVOC emissions (mainly monoterpenes, MTs) and radial stem growth during the development of drought stress. We observed an increasing-decreasing trend in the MT emissions as well as in the fraction of assimilated carbon re-emitted back into the atmosphere (ranging between 0.14 and 0.01%). We were able to link these dynamics to pronounced changes in radial stem growth, which served as a direct plant stress indicator. Interestingly, we detected a sudden burst in emission of a non-identified, non-MT BVOC species when drought stress was acute (i.e. pronounced negative stem growth). This burst might have been caused by a certain stress-related green leaf volatile, which disappeared immediately upon re-watering and thus the alleviation of drought stress. These results highlight that direct plant stress sensing creates opportunities to understand the overall complexity of stress-related BVOC emissions.
[Simpraga2011a] Šimpraga, M., H. Verbeeck, M. Demarcke, É. Joó, C. Amelynck, N. Schoon, J. Dewulf, H. Van Langenhove, B. Heinesch, M. Aubinet, et al., "Comparing monoterpenoid emissions and net photosynthesis of beech ( Fagus sylvatica L.) in controlled and natural conditions", Atmospheric Environment, vol. 45, no. 17: Elsevier, pp. 2922–2928, 2011.
Link: http://www.sciencedirect.com/science/article/pii/S1352231011000884
Abstract
<p>Although biogenic volatile organic compounds (BVOCs) only represent a very limited fraction of the plant&rsquo;s carbon (C) budget, they play an important role in atmospheric chemistry for example as a precursor of tropospheric ozone. We performed a study comparing BVOC emissions of European beech (Fagus sylvatica L.) in controlled and natural environmental conditions. A young and adult beech tree was exposed to short-term temperature variations in growth room conditions and in an experimental forest, respectively. This study attempts to clarify how short-term temperature variations between days influenced the ratio between monoterpenoid (MT) emissions and net photosynthesis (Pn). Within a temperature range of 17&ndash;27 &deg;C and 13&ndash;23 &deg;C, the MT/Pn carbon ratio increased 10&ndash;30 fold for the growth room and forest, respectively. An exponential increasing trend between MT/Pn C ratio and air temperature was observed in both conditions. Beech trees re-emitted a low fraction of the assimilated C back into the atmosphere as MT: 0.01&ndash;0.12% and 0.01&ndash;0.30% with a temperature rise from 17 to 27 &deg;C and 13&ndash;23 &deg;C in growth room and forest conditions, respectively. However, the data showed that the MT/Pn C ratio of young and adult beech trees responded significantly to changes in temperature.</p>
[Joo2011] Joó, É., J. Dewulf, C. Amelynck, N. Schoon, O. Pokorska, M. Šimpraga, K. Steppe, M. Aubinet, and H. Van Langenhove, "Constitutive versus heat and biotic stress induced BVOC emissions in Pseudotsuga menziesii", Atmospheric Environment, vol. 45, no. 22: Elsevier, pp. 3655–3662, 2011.
Link: http://www.sciencedirect.com/science/article/pii/S1352231011004377
Abstract
Induced volatiles have been a focus of recent research, as not much is known of their emission behavior or atmospheric contribution. BVOC emissions were measured from Pseudotsuga menziesii saplings under natural environmental conditions, using a dynamic branch enclosure system and GC–MS for their analysis. We determined temperature and light dependency of the individual compounds, studied seasonality of the emissions and discuss the effect of heat stress in comparison with two specific biotic stresses that occurred naturally on the trees. A standardized emission rate of 6.8 μg g(dw)−1 h−1 for monoterpenes under stressed conditions was almost a magnitude higher than that obtained for healthy trees (0.8 ± 0.2 μg g(dw)−1 h−1), with higher beta factors characterizing the stressed trees. The response of the emissions to light intensity was different for the individual compounds, suggesting a distinct minimum light intensity to reach saturation. Heat stress changed the relative contribution of specific volatiles, with larger extent of increase of sesquiterpenes, methyl salicylate and linalool emissions compared to monoterpenes. Biotic stress kept low the emissions of sesquiterpenes, (E)-4,8-dimethyl-1,3,7-nonatriene and methylbutenol isomers, and increased the level of methyl salicylate and monoterpenes. The ratio of β-pinene/α-pinene was also found to be significantly enhanced from 1.3 to 2.4 and 3.2 for non-stressed, heat stressed and combined biotic and heat stressed, respectively.
[Laffineur2011a] Laffineur, Q., M. Aubinet, N. Schoon, C. Amelynck, J-F. Müller, J. Dewulf, H. Van Langenhove, K. Steppe, M. Šimpraga, and B. Heinesch, "Isoprene and monoterpene emissions from a mixed temperate forest", Atmospheric Environment, vol. 45, no. 18: Elsevier, pp. 3157–3168, 2011.
Link: http://www.sciencedirect.com/science/article/pii/S1352231011001981
Abstract
<p>We measured the isoprene and monoterpene fluxes continuously above a mixed forest site at Vielsalm in the eastern part of Belgium, using the disjunct eddy covariance technique with proton transfer reaction-mass spectrometry. Simultaneously, we also measured the carbon dioxide fluxes in order to deduce the gross primary production. The measurements were conducted from July to September 2009. During the day, the seasonal evolution of the isoprene/monoterpene emissions was studied using a monthly temperature and light dependence function deduced from our results to standardize the fluxes. A seasonal decrease in the standard emission factors was observed, probably linked to acclimation or senescence. The standard emission factor for isoprene fluxes (30 &deg;C, 1000 μmol m&minus;2 s&minus;1) fell from 0.91 &plusmn; 0.01 to 0.56 &plusmn; 0.02 μg m&minus;2 s&minus;1 and for monoterpene fluxes from 0.74 &plusmn; 0.03 to 0.27 &plusmn; 0.03 μg m&minus;2 s&minus;1. During the night, a slight positive flux of monoterpenes was observed that seemed to be driven by air temperature. The standard emission factor (30&deg;C) for nighttime monoterpene fluxes was equal to 0.093 &plusmn; 0.019 μg m&minus;2 s&minus;1. Finally, we studied the seasonal evolution of the relationship between the gross primary production and the isoprene/monoterpenes fluxes. A linear relationship was observed, highlighting the strong link between carbon assimilation and isoprene/monoterpene emissions.</p>
[Laffineur2011] Laffineur, Q., B. Heinesch, N. Schoon, C. Amelynck, J-F. Müller, J. Dewulf, H. Van Langenhove, E. Joó, K. Steppe, and M. Aubinet, "What can we learn from year-round BVOC disjunct eddycovariance measurements? A case example from a temperate forest", 5th International PTR-MS Conference on Proton Transfer Reaction Mass Spectrometry and its Applications: Innsbruck university press, 2011.
Link: http://www.ionicon.com/sites/default/files/uploads/doc/contributions_ptr_ms_Conference_5.pdf
2010
[Demarcke2010a] Demarcke, M., C. Amelynck, N. Schoon, F. Dhooghe, J. Rimetz-Planchon, H. Van Langenhove, and J. Dewulf, "Laboratory studies in support of the detection of biogenic unsaturated alcohols by proton transfer reaction-mass spectrometry", International Journal of Mass Spectrometry, vol. 290, no. 1: Elsevier, pp. 14–21, 2010.
Link: http://www.sciencedirect.com/science/article/pii/S1387380609003558
Abstract
The effect of the ratio of the electric field to the buffer gas number density (E/N) in the drift tube reactor of a proton transfer reaction-mass spectrometer (PTR-MS) on the product ion distributions of seven common biogenic unsaturated alcohols (2-methyl-3-buten-2-ol, 1-penten-3-ol, cis-3-hexen-1-ol, trans-2-hexen-1-ol, 1-octen-3-ol, 6-methyl-5-hepten-2-ol and linalool) has been investigated. At low E/N values, the dominant product ion is the dehydrated protonated alcohol. Increasing E/N results in more extensive fragmentation for all compounds. For cis-3-hexenol and 6-methyl-5-hepten-2-ol the contribution of the protonated molecule can be enhanced by reducing E/N with respect to commonly used PTR-MS E/N values (120–130 Td). Significant differences have been found between some of the isomeric species studied, opening a way for selective detection. The C10 alcohol linalool mainly results in product ions at m/z 137 and 81, which are also PTR-MS fingerprints of monoterpenes. This may complicate monoterpene quantification when linalool and monoterpenes are simultaneously present in sampled air. Furthermore the influence of the water vapour pressure in the PTR-MS inlet line on the product ion distributions has been determined. Some major fingerprint ions of the unsaturated alcohols were found to depend significantly on the water vapour pressure in the inlet line and this should be taken into account for accurate quantification of these species by PTR-MS.
2009
[Steppe2009] Steppe, K., R. Lemeur-UGent, J. Dewulf, H. Van Langenhove-UGent, C. Amelynck, N. Schoon, J-F. Müller-BISA, M. Aubinet-FUSAG, J. Dewulf, E. Joó, et al., "IMPACT OF PHENOLOGY AND ENVIRONMENTAL CONDITIONS ON BVOC EMISSIONS FROM FOREST ECOSYSTEMS IMPECVOC", Science for Sustainable Development (SSD), 2009.
Link: http://www.belspo.be/belspo/ssd/science/Reports/FinalReport_IMPECVOC_phase1.ML.pdf
2008
[Demarcke2008] Demarcke, M., C. Amelynck, N. Schoon, JF. Muller, É. Joó, J. Dewulf, H. Van Langenhove, M. Simpraga, K. Steppe, R. Samson, et al., "Measurements of BVOC emissions from Fagus sylvatica L. in controlled environmental conditions: preliminary results", European Geophysical Union Conference, 2008.
Link: http://meetings.copernicus.org/www.cosis.net/abstracts/EGU2008/02589/EGU2008-A-02589-1.pdf
[Simpraga2008] Simpraga, M., K. Steppe, M. Demarcke, C. Amelynck, N. Schoon, É. Joó, J. Dewulf, H. Van Langenhove, R. Samson, JF. Muller, et al., "Preliminary observations of temperature effects on carbon losses throught BVOC emissions in Fagus sylVatica L.", European Geophysical Union Conference, vol. 10, 2008.
Link: https://biblio.ugent.be/publication/1208460/file/1209475.pdf

Featured Articles

Download Contributions to the International Conference on Proton Transfer Reaction Mass Spectrometry and Its Applications:

 

Selected PTR-MS related Reviews

F. Biasioli, C. Yeretzian, F. Gasperi, T. D. Märk: PTR-MS monitoring of VOCs and BVOCs in food science and technology, Trends in Analytical Chemistry 30 (7) (2011).
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J. de Gouw, C. Warneke, T. Karl, G. Eerdekens, C. van der Veen, R. Fall: Measurement of Volatile Organic Compounds in the Earth's Atmosphere using Proton-Transfer-Reaction Mass Spectrometry. Mass Spectrometry Reviews, 26 (2007), 223-257.
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W. Lindinger, A. Hansel, A. Jordan: Proton-transfer-reaction mass spectrometry (PTR–MS): on-line monitoring of volatile organic compounds at pptv levels, Chem. Soc. Rev. 27 (1998), 347-375.
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Lists with PTR-MS relevant publications of the University of Innsbruck can be found here: Atmospheric and indoor air chemistry, IMR, Environmental Physics and Nano-Bio-Physics

 

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