Maarten Op de Beeck
University of Antwerp
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Featured researches published by Maarten Op de Beeck.
Tree Physiology | 2009
Arthur Gessler; Markus Löw; C. Heerdt; Maarten Op de Beeck; Johannes Schumacher; Thorsten E. E. Grams; Günther Bahnweg; R. Ceulemans; Herbert Werner; Rainer Matyssek; Heinz Rennenberg; Kristine Haberer
In this study, the effects of different light intensities either in direct sunlight or in the shade crown of adult beech (Fagus sylvatica L.) trees on delta13C and Delta18O were determined under ambient (1 x O3) and twice-ambient (2 x O3) atmospheric ozone concentrations during two consecutive years (2003 and 2004). We analysed the isotopic composition in leaf bulk, leaf cellulose, phloem and xylem material and related the results to (a) meteorological data (air temperature, T and relative humidity, RH), (b) leaf gas exchange measurements (stomatal conductance, g(s); transpiration rate, E; and maximum photosynthetic activity, A(max)) and (c) the outcome of a steady-state evaporative enrichment model. Delta13C was significantly lower in the shade than in the sun crown in all plant materials, whilst Delta18O was increased significantly in the shade than in the sun crown in bulk material and cellulose. Elevated ozone had no effect on delta13C, although Delta18O was influenced by ozone to varied degrees during single months. We observed significant seasonal changes for both parameters, especially in 2004, and also significant differences between the study years. Relating the findings to meteorological data and gas exchange parameters, we conclude that the differences in Delta18O between the sun and the shade crown were predominantly caused by the Péclet effect. This assumption was supported by the modelled Delta18O values for leaf cellulose. It was demonstrated that independent of RH, light-dependent reduction of stomatal conductance (and thus transpiration) and of A(max) can drive the pattern of Delta18O increase with the concomitant decrease of delta13C in the shade crown. The effect of doubling ozone levels on time-integrated stomatal conductance and transpiration as indicated by the combined analysis of Delta18O and delta13C was much lower than the influence caused by the light exposure.
New Phytologist | 2012
Markus Löw; Gaby Deckmyn; Maarten Op de Beeck; M. Blumenröther; Wolfgang Oßwald; M. Alexou; Sascha Jehnes; Kristine Haberer; Heinz Rennenberg; K. Herbinger; Karl-Heinz Häberle; Günther Bahnweg; David E. Hanke; Gerhard Wieser; R. Ceulemans; Rainer Matyssek; Michael Tausz
• Increasing atmospheric concentrations of phytotoxic ozone (O(3) ) can constrain growth and carbon sink strength of forest trees, potentially exacerbating global radiative forcing. Despite progress in the conceptual understanding of the impact of O(3) on plants, it is still difficult to detect response patterns at the leaf level. • Here, we employed principal component analysis (PCA) to analyse a database containing physiological leaf-level parameters of 60-yr-old Fagus sylvatica (European beech) trees. Data were collected over two climatically contrasting years under ambient and twice-ambient O(3) regimes in a free-air forest environment. • The first principal component (PC1) of the PCA was consistently responsive to O(3) and crown position within the trees over both years. Only a few of the original parameters showed an O(3) effect. PC1 was related to parameters indicative of oxidative stress signalling and changes in carbohydrate metabolism. PC1 correlated with cumulative O(3) uptake over preceding days. • PC1 represents an O(3) -responsive multivariate pattern detectable in the absence of consistently measurable O(3) effects on individual leaf-level parameters. An underlying effect of O(3) on physiological processes is indicated, providing experimental confirmation of theoretical O(3) response patterns suggested previously.
Nature Climate Change | 2015
Yan-Shih Lin; Belinda E. Medlyn; Remko A. Duursma; I. Colin Prentice; Han Wang; Sofia Baig; Derek Eamus; Víctor Resco de Dios; Patrick J. Mitchell; David S. Ellsworth; Maarten Op de Beeck; Göran Wallin; Johan Uddling; Lasse Tarvainen; Maj-Lena Linderson; Lucas A. Cernusak; Jesse B. Nippert; Troy W. Ocheltree; David T. Tissue; Nicolas K. Martin-StPaul; Alistair Rogers; Jeff Warren; Paolo De Angelis; Kouki Hikosaka; Qingmin Han; Yusuke Onoda; Teresa E. Gimeno; Craig V. M. Barton; Jonathan Bennie; Damien Bonal
Global Ecology and Biogeography | 2014
Yongshuo H. Fu; Shilong Piao; Maarten Op de Beeck; Nan Cong; Hongfang Zhao; Yuan Zhang; Annette Menzel; Ivan A. Janssens
Tree Physiology | 2007
Hans Verbeeck; Kathy Steppe; N. Nadezhdina; Maarten Op de Beeck; Gaby Deckmyn; Linda Meiresonne; Raoul Lemeur; Jan Čermák; R. Ceulemans; Ivan A. Janssens
Agricultural and Forest Meteorology | 2012
Sophie Y. Dillen; Maarten Op de Beeck; Koen Hufkens; Michele Buonanduci; Nathan Phillips
Silva Fennica | 2009
Gaby Deckmyn; Boštjan Mali; Hojka Kraigher; Niko Torelli; Maarten Op de Beeck; R Ceulemans
Atmospheric Environment | 2011
Maarten De Bock; Maarten Op de Beeck; Ludwig De Temmerman; Yves Guisez; R. Ceulemans; Karine Vandermeiren
Agricultural and Forest Meteorology | 2010
Maarten Op de Beeck; Markus Löw; Gaby Deckmyn; R. Ceulemans
Biogeosciences Discussions | 2007
Hans Verbeeck; Kathy Steppe; N. Nadezhdina; Maarten Op de Beeck; Gaby Deckmyn; Linda Meiresonne; Raoul Lemeur; Jan Čermák; R Ceulemans; Ivan A. Janssens