Degrees

Courses

Research activities on forest ecosystem functioning

The general topic of my research is the functioning of forest ecosystems in relation to global change and forest management. The research projects that I conducted or in which I collaborated led me to become interested in mineral nutrition of trees, in forest health and in biogeochemical cycling at the ecosystem scale. I usually put out different techniques combining experimental and modeling approaches: manipulation experiments in situ, studies in controlled conditions, monitoring, statistical and mechanistic modeling.

Tree nutrition and forest health

My first study on tree nutrition concerned the long-term effects of thinning on the foliar nutritional status of Norway spruce. Based on thinning trials, I showed that the increase in the forest floor mass with stand density was accompanied by a parallel increase in the foliar N, P and K concentrations (Jonard et al., 2006). At that time, we hypothesized that the forest floor provides an alternative medium for root growth, more favorable to P uptake than the underlying mineral soil.

During a postdoctoral stay in France (INRA), I combined a greenhouse experiment with a modeling approach to test this hypothesis. The experiment aimed at (i) comparing the P uptake of maritime pine seedlings growing either in mineral soil or in mineral soil covered with a forest floor layer and (ii) evaluating the contribution of the forest floor to P supply using an isotopic tracer (Jonard et al., 2009). The comprehensive description of the two soil-plant systems was used to develop and test a model integrating the processes that regulate P availability and P uptake (Jonard et al., 2010).

Throughout my career, I have been involved in forest monitoring activities conducted under the international cooperative program on the assessment of air pollution effects on forests (LRTAP/UNECE). In 2006, I processed the foliar chemistry data of the French, Walloon and Luxembourg plots of forest monitoring. This statistical analysis revealed a general decrease in the foliar P concentration of all broadleaved species and of some coniferous between 1993 and 2005.

In the Belgian Ardennes, the mineral nutrition of Norway spruce and beech trees is deficient in Mg and the foliar Ca concentration is very low. In addition, several episodes of decline were observed, particularly following the 2003 drought. In 1995, a series of liming and fertilization trials were installed in this region. I recently completed a synthesis of the results obtained in these trials. Liming improved significantly Mg and Ca nutrition, limited the increase in defoliation that occurred during the three consecutive dry years (2003 to 2005) and increased slightly stand productivity.

Biogeochemical cycles

Regarding the carbon cycle, I have considered three aspects: carbon allocation, leaf litter dynamics and soil respiration.

I worked on the elaboration of equations predicting tree component biomass based on tree characteristics (Wauters et al., 2008; André et al., 2010; Genet et al., submitted).

During my PhD thesis, I focused on the processes that regulate leaf litterfall, decomposition and accumulation. The objective was to evaluate the relative importance of the different factors by which tree species composition can influence leaf litter dynamics in mixed stands of oak and beech. As the species composition of leaf litter varies from place to place in mixed stands, I developed a mechanistic leaf dispersal model accounting for wind effects and release height (Jonard et al., 2006). Based on this expertise, I collaborated to the development of a seed dispersal model for Prunus serotina (Pairon et al., 2006). In parallel, a transplantation litterbag experiment was conducted to evaluate separately the effects of leaf litter quality and of environmental conditions on leaf decomposition (Jonard et al., 2008). The decomposition of the forest floor was also studied from soil respiration measurements taken in situ and during laboratory incubation of forest floor samples (Jonard et al., 2007).   

At the same experimental site, two studies on water cycle (tree transpiration and rainfall) were also conducted. The objective of the first study was (i) to compare oak and beech tree transpiration in pure stands located at a same site and within a mixed stand and (ii) to evaluate the mixture effects by comparing tree transpiration of a same species in pure and mixed stands. In this work, we pointed out that the species and mixture effects on individual transpiration can be ascribed to contrasted individual LAI (Jonard et al., submitted). The second study describes how species composition and stand density affect the partitioning of rainfall into throughfall, stemflow and interception (André et al., 2008 a and b).

At this experimental site, it is also planed to complete nutrient budgets for stands of different species composition. Two components of these budgets were already characterized: atmospheric deposition and nutrient removal at harvesting; the remaining components will be quantified in the future (weathering and leaching). A PhD thesis was conducted to study the influence of tree species composition on atmospheric deposition, distinguishing external inputs (dry deposition) from internal cycling (foliar exchanges). Species composition was shown to strongly affect the alteration of rainfall chemistry when passing through the canopy (André et al., 2007 and 2008a and b). On the other hand, a destructive sampling was carried out to investigate the effects of tree species, tree size and harvesting regime on nutrient removal at harvesting (André et al., 2010).

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2012 Article de périodique (Journal article) Jonard, Mathieu; Legout, Arnaud; Nicolas, Manuel; Dambrine, Etienne; Nys, Claude; van der Perre, R.; Ponette, Q. et al. (2012). Deterioration of Norway spruce vitality despite a sharp decline in acid deposition : a long-term integrated perspective. In : Global Change Biology (2012), p. 711-725. doi: 10.1111/j.1365-2486.2011.02550.x. http://hdl.handle.net/2078.1/105468. Campioli, M.; Vincke, Caroline; Jonard, Mathieu; Kint, Vincent; Demarée, Gaston; Ponette, Q. et al. (2012). Current status and predicted impact of climate change on forest production and biogeochemistry in the temperate oceanic European zone : review and prospects for Belgium as a case study. In : Journal of Forest Research (-), p. 1-18. doi: 10.1007/s10310-011-0255-8. http://hdl.handle.net/2078.1/105467. 2011 Article de périodique (Journal article) André, Frédéric; Jonard, Mathieu; Jonard, François; Ponette, Quentin (2011). Spatial and temporal patterns of throughfall volume in a deciduous mixed-species stand. In : Journal of Hydrology (30 March 2011), p. 244-254. doi: 10.1016/j.jhydrol.2011.01.037. http://hdl.handle.net/2078/73474. Genet, Astrid; Wernsdörfer, Holger; Mothe, Frédéric; Bock, Jérôme; Ponette, Quentin; Jonard, M.; Saint-André, L. et al. (2011). Des modèles robustes et génériques de Biomasse.Exemple du hêtre. In : Revue Forestière Française (mars-avril 2011), p. 179-190. doi: 10.4267/2042/45203. http://hdl.handle.net/2078.1/96105. Jonard, François; André, Frédéric; Ponette, Quentin; Vincke, Caroline; Jonard, Mathieu (2011). Sap flux density and stomatal conductance of European beech and common oak trees in pure and mixed stands during the summer drought of 2003. In : Journal of Hydrology. doi: 10.1016/j.hydrol.2011.08.032. http://hdl.handle.net/2078.1/90415. Genet, A.; Wernsdörfer, H.; Jonard, Mathieu; Pretzsch, H.; Rauch, M.; Ponette, Q.; Vallet, P. et al. (2011). Ontogeny partly explains the apparent heterogeneity of published biomass equations for Fagus sylvatica in central Europe. In : Forest Ecology and Management (-), p. 1188-1202. doi: 10.1016/j.foreco.2010.12.034. http://hdl.handle.net/2078.1/105500. Communication à un colloque (Conference Paper) Jonard, Mathieu; Legout, A; Nicolas, M.; Dambrine, E.; Nys, C.; Van der Perre, R.; Ponette, Q. et al. (2011). Norway spruce vitality loss despite a sharp decline in acid deposition : how liming may help ?. Final Symposium International Francqui Chair, Antwerpen - Belgium le 15-12-2011. http://hdl.handle.net/2078.1/105501. Gallet-Budynek, A.; Achat , D.L.; Bakker, M.R.; Augusto, L.; Gonzalez, M.; Jonard, M.; Morel, C. et al. (2011). Understanding nutrient limitation in a temperate forest ecosystem : contribution of biological process to soil phosphorus bioavailability. CLIMMANI/INTERFACE Workshop, Keflavik - Iceland du 15-06-2011 au 17-06-2011. http://hdl.handle.net/2078.1/105505. Jonard, Mathieu; André, Frédéric; Jonard, François; Ponette, Quentin (2011). Le mélange chêne-hêtre : fonctionnement et implications pour la gestion. Symposium relatif à la gestion durable de la chênaie, Chimay - Belgique le 14-12-2011. http://hdl.handle.net/2078.1/105503. 2010 Article de périodique (Journal article) Jonard, Mathieu; Augusto, Laurent; Hanert, Emmanuel; Achat, David L.; Bakker, Mark R.; Pellerin, S. et al. (2010). Modeling forest floor contribution to phosphorus supply to maritime pine seedlings in two-layered forest soils. In : Ecological Modelling (2010), p. 927-935. doi: 10.1016/j.ecolmodel.2009.12.017. http://hdl.handle.net/2078.1/34052. Jonard, Mathieu; André, Frédéric; Giot, Pierre; Weissen, Francois; Van der Perre, Raphaele; Ponette, Q. et al. (2010). Thirteen-year monitoring of liming and PK fertilization effects on tree vitality in Norway spruce and European beech stands. In : European Journal of Forest Research (2010), p. 1203-1211. doi: 10.1007/s10342-010-0410-3. http://hdl.handle.net/2078.1/34984. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2010). Biomass and nutrient content of sessile oak (Quercus petraea (Matt.) Liebl.) and beech (Fagus sylvatica L.) stem and branches in a mixed stand in southern Belgium. In : The Science of the total environment (2010), p. 2285-94. doi: 10.1016/j.scitotenv.2010.02.040. http://hdl.handle.net/2078.1/30495. Van der Perre, Raphaèle; Jonard, Mathieu; Nys, Claude; Ponette, Quentin (2010). Impacts de l'amendement sur la réaction des peuplements au stress hydrique. In : Forêt Wallonne (2010), p. 21-37. http://hdl.handle.net/2078.1/70857. Braem, Steve; Jonard, Mathieu; VANWIJNSBERGHE, Stéphane; Defourny, Pierre; Ponette, Quentin (2010). Bilan de santé de la forêt de Soignes bruxelloise. In : Forêt Wallone (2010), p. 15-25. http://hdl.handle.net/2078.1/70855. Communication à un colloque (Conference Paper) Jonard, Mathieu; Augusto, Laurent; Achat, D.L.; Morel, C.; Hanert, Emmanuel; Ponette, Q.; Pellerin, S. et al. (2010). Phosphorous nutrition of forest trees : the role of the forest floor. 4th International Symposium on Phosphorous Dynamics in the Soil-Plant Continuum (ISPDSPC), Beijing - China du 19-09-2010 au 23-09-2010. http://hdl.handle.net/2078.1/105523. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2010). Tree species and mixture effects on leaf litter fall, decomposition and accumulation in common oak and European beech forest. Mixed and Pure Forests in a Changing World, Vila Real - Portugal du 5-10-2010 au 8-10-2010. http://hdl.handle.net/2078.1/105507. 2009 Article de périodique (Journal article) Jonard, Mathieu; Augusto, Laurent; Morel, Christian; Achat, David L.; Saur, Etienne (2009). Forest floor contribution to phosphorus nutrition: experimental data. In : Annals of Forest Science (2009). doi: 10.1051/forest/2009039. http://hdl.handle.net/2078.1/35486. Jonard, Mathieu; André, Frédéric; Dambrine, Etienne; Ponette, Quentin; Ulrich, Erwin (2009). Temporal trends in the foliar nutritional status of the French, Walloon and Luxembourg broad-leaved plots of forest monitoring. In : Annals of Forest Science (2009). doi: 10.1051/forest/2009014. http://hdl.handle.net/2078.1/35553. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2009). Cycle des éléments et évaluation de la fertilité chimique en forêt. In : Forêt Wallonne (2009), p. 60-70. http://hdl.handle.net/2078.1/70853. Heyninck, Christophe; Jonard, Mathieu (2009). Des hêtraies qui poussent plus vite. In : Forêt Wallonne (2009), p. 17-23. http://hdl.handle.net/2078.1/70854. 2008 Article de périodique (Journal article) André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Precipitation water storage capacity in a temperate mixed oak-beech canopy. In : Hydrological Processes : an international journal (2008), p. 4130-4141. doi: 10.1002/hyp.7013. http://hdl.handle.net/2078.1/36313. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Influence of species and rain event characteristics on stemflow volume in a temperate mixed oak-beech stand. In : Hydrological Processes : an international journal (2008), p. 4455-4466. doi: 10.1002/hyp.7048. http://hdl.handle.net/2078.1/36264. Wauters, J. B.; Coudert, S.; Grallien, E.; Jonard, Mathieu; Ponette, Quentin (2008). Carbon stock in rubber tree plantations in Western Ghana and Mato Grosso (Brazil). In : Forest Ecology and Management (2008), p. 2347-2361. doi: 10.1016/j.foreco.2007.12.038. http://hdl.handle.net/2078.1/36564. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2008). Tree species mediated effects on leaf litter dynamics in pure and mixed stands of oak and beech. In : Canadian Journal of Forest Research (2008), p. 528-538. doi: 10.1139/X07-183. http://hdl.handle.net/2078.1/36780. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Spatial and temporal patterns of throughfall chemistry within a temperate mixed oak-beech stand. In : The Science of the total environment (2008), p. 215-28. doi: 10.1016/j.scitotenv.2008.02.043. http://hdl.handle.net/2078.1/11369. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Effects of biological and meteorological factors on stemflow chemistry within a temperate mixed oak-beech stand. In : The Science of the total environment (2008), p. 72-83. doi: 10.1016/j.scitotenv.2007.12.002. http://hdl.handle.net/2078.1/11256. Croisé, Luc; Jonard, Mathieu (2008). Evolution de la nutrition des peuplements vers une carence générale en phosphore ?. In : Rendez-vous techniques hors-série (2008), p. 120-126. http://hdl.handle.net/2078.1/70852. Monographie (Book) Jonard, Mathieu; Ulrich, E.; Giot-Wirgot, Pierre; Dambrine, Etienne (2008). Facteurs explicatifs de la variabilité et évolution temporelle de la nutrition foliaire dans les réseaux de suivi à long terme des écosystèmes forestiers de France (RENECOFOR), de Belgique (Wallonie) et du Grand-Duché de Luxembourg (Période 1993 - 2005). Office National des Forêts : Fontainebleau. p. 67. http://hdl.handle.net/2078.1/71168. 2007 Article de périodique (Journal article) Jonard, Mathieu; André, Frédéric; Jonard, Francois; Mouton, Nicolas; Proces, Pierre; Ponette, Q. et al. (2007). Soil carbon dioxide efflux in pure and mixed stands of oak and beech. In : Annals of Forest Science (2007), p. 141-150. doi: 10.1051/forest:2006098. http://hdl.handle.net/2078.1/37755. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2007). Influence of meteorological factors and polluting environment on rain chemistry and wet deposition in a rural area near Chimay, Belgium. In : Atmospheric Environment (2007), p. 1426-1439. doi: 10.1016/j.atmosenv.2006.10.013. http://hdl.handle.net/2078.1/37754. Communication à un colloque (Conference Paper) Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2007). Dynamique des litières foliaires en peuplements purs et mélangé de chêne et de hêtre. Atelier Recherche et Gestion Forestière "Forêts mélangées : quels scénarios pour l'avenir ?, Nancy - France du 26-06-2007 au 28-06-2007. http://hdl.handle.net/2078.1/105542. Croisé, L.; Jonard, Mathieu (2007). Evolution de la nutrition des peuplements : vers une carence générale en phosphore ? 15 ans de suivi des écosystèmes forestiers. Résultats, acquis et perspectives de RENECOFOR, Beaune - France du 9-05-2007 au 11-05-2007. http://hdl.handle.net/2078.1/105539. 2006 Article de périodique (Journal article) Jonard, Mathieu; Misson, Laurent; Ponette, Quentin (2006). Long-term thinning effects on the forest floor and the foliar nutrient status of Norway spruce stands in the Belgian Ardennes. In : Canadian Journal of Forest Research (2006), p. 2684-2695. doi: 10.1139/X06-153. http://hdl.handle.net/2078.1/38149. Pairon, Marie; Jonard, Mathieu; Jacquemart, Anne-Laure (2006). Modeling seed dispersal of black cherry, an invasive forest tree: how microsatellites may help?. In : Canadian Journal of Forest Research (2006), p. 1385-1394. doi: 10.1139/X06-018. http://hdl.handle.net/2078.1/38420. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2006). Modeling leaf dispersal in mixed hardwood forests using a ballistic approach. In : Ecology (2006), p. 2306-18. doi: 10.1890/0012-9658(2006)87[2306:MLDIMH]2.0.CO;2. http://hdl.handle.net/2078.1/10713. Giot-Wirgot, Pierre; Ponette, Quentin; Jonard, Mathieu (2006). Le point sur une expérience d'amendements en peuplements d'épicéa, hêtre et chêne. In : Forêt Wallonne (2006), p. 32-37. http://hdl.handle.net/2078.1/70851. 2005 Article de périodique (Journal article) Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2005). Accumulation de litière foliaire en peuplements purs et mélangés de chêne sessile et de hêtre. In : Forêt Wallonne (2005), p. 12-20. http://hdl.handle.net/2078.1/70850. Communication à un colloque (Conference Paper) Wauters, J.B.; Bemelmans, Daniel; Bortolazzo, R.; Coudert, S.; Difle, S.; Giot, P.; Jonard, M.; Ponette, Q. et al. (2005). Measurement and prediction of carbon content in rubber tree (Hevea brasiliensis) plantations. International Natural Rubber Conference, Kottayan, Kerala - India du 6-11-2005 au 8-11-2005. http://hdl.handle.net/2078.1/105541. 2004 Article de périodique (Journal article) Jonard, Mathieu; Ponette, Quentin; Giot-Wirgot, Pierre (2004). Impact de l'intensité d'éclaircie sur l'humus et sur les teneurs foliaires en pessière. In : Forêt Wallonne (2004), p. 35-39. http://hdl.handle.net/2078.1/70849. Communication à un colloque (Conference Paper) Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2004). Impact du mélange sur la dynamique des litières : dispersion des feuilles. Séminaire Forêts Hétérogènes, Nancy, France du 22-06-2004 au 23-06-2004. http://hdl.handle.net/2078.1/105469. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2004). Soil carbon dioxide efflux in a mixed stand of oak and beech : abiotic factors and species effects. International Symposium : forest soils under global and local changes, Bordeaux - France du 15-09-2004 au 18-09-2004. http://hdl.handle.net/2078.1/105544. 2001 Article de périodique (Journal article) Misson, L; de Warnaffe, GD; Jonard, Mathieu (2001). Effects of fertilization on the vascular ground vegetation of European beech (Fagus sylvatica L.) and sessile oak (Quercus petraea (Matt.) Lieb.) stands. In : Annals of Forest Science (2001), p. 829-842. doi: 10.1051/forest:2001166. http://hdl.handle.net/2078.1/42399.

Biography

Degrees

Teaching

Courses

Research

Research activities on forest ecosystem functioning

The general topic of my research is the functioning of forest ecosystems in relation to global change and forest management. The research projects that I conducted or in which I collaborated led me to become interested in mineral nutrition of trees, in forest health and in biogeochemical cycling at the ecosystem scale. I usually put out different techniques combining experimental and modeling approaches: manipulation experiments in situ, studies in controlled conditions, monitoring, statistical and mechanistic modeling.

Tree nutrition and forest health

My first study on tree nutrition concerned the long-term effects of thinning on the foliar nutritional status of Norway spruce. Based on thinning trials, I showed that the increase in the forest floor mass with stand density was accompanied by a parallel increase in the foliar N, P and K concentrations (Jonard et al., 2006). At that time, we hypothesized that the forest floor provides an alternative medium for root growth, more favorable to P uptake than the underlying mineral soil.

During a postdoctoral stay in France (INRA), I combined a greenhouse experiment with a modeling approach to test this hypothesis. The experiment aimed at (i) comparing the P uptake of maritime pine seedlings growing either in mineral soil or in mineral soil covered with a forest floor layer and (ii) evaluating the contribution of the forest floor to P supply using an isotopic tracer (Jonard et al., 2009). The comprehensive description of the two soil-plant systems was used to develop and test a model integrating the processes that regulate P availability and P uptake (Jonard et al., 2010).

Throughout my career, I have been involved in forest monitoring activities conducted under the international cooperative program on the assessment of air pollution effects on forests (LRTAP/UNECE). In 2006, I processed the foliar chemistry data of the French, Walloon and Luxembourg plots of forest monitoring. This statistical analysis revealed a general decrease in the foliar P concentration of all broadleaved species and of some coniferous between 1993 and 2005.

In the Belgian Ardennes, the mineral nutrition of Norway spruce and beech trees is deficient in Mg and the foliar Ca concentration is very low. In addition, several episodes of decline were observed, particularly following the 2003 drought. In 1995, a series of liming and fertilization trials were installed in this region. I recently completed a synthesis of the results obtained in these trials. Liming improved significantly Mg and Ca nutrition, limited the increase in defoliation that occurred during the three consecutive dry years (2003 to 2005) and increased slightly stand productivity.

Biogeochemical cycles

Regarding the carbon cycle, I have considered three aspects: carbon allocation, leaf litter dynamics and soil respiration.

I worked on the elaboration of equations predicting tree component biomass based on tree characteristics (Wauters et al., 2008; André et al., 2010; Genet et al., submitted).

During my PhD thesis, I focused on the processes that regulate leaf litterfall, decomposition and accumulation. The objective was to evaluate the relative importance of the different factors by which tree species composition can influence leaf litter dynamics in mixed stands of oak and beech. As the species composition of leaf litter varies from place to place in mixed stands, I developed a mechanistic leaf dispersal model accounting for wind effects and release height (Jonard et al., 2006). Based on this expertise, I collaborated to the development of a seed dispersal model for Prunus serotina (Pairon et al., 2006). In parallel, a transplantation litterbag experiment was conducted to evaluate separately the effects of leaf litter quality and of environmental conditions on leaf decomposition (Jonard et al., 2008). The decomposition of the forest floor was also studied from soil respiration measurements taken in situ and during laboratory incubation of forest floor samples (Jonard et al., 2007).   

At the same experimental site, two studies on water cycle (tree transpiration and rainfall) were also conducted. The objective of the first study was (i) to compare oak and beech tree transpiration in pure stands located at a same site and within a mixed stand and (ii) to evaluate the mixture effects by comparing tree transpiration of a same species in pure and mixed stands. In this work, we pointed out that the species and mixture effects on individual transpiration can be ascribed to contrasted individual LAI (Jonard et al., submitted). The second study describes how species composition and stand density affect the partitioning of rainfall into throughfall, stemflow and interception (André et al., 2008 a and b).

At this experimental site, it is also planed to complete nutrient budgets for stands of different species composition. Two components of these budgets were already characterized: atmospheric deposition and nutrient removal at harvesting; the remaining components will be quantified in the future (weathering and leaching). A PhD thesis was conducted to study the influence of tree species composition on atmospheric deposition, distinguishing external inputs (dry deposition) from internal cycling (foliar exchanges). Species composition was shown to strongly affect the alteration of rainfall chemistry when passing through the canopy (André et al., 2007 and 2008a and b). On the other hand, a destructive sampling was carried out to investigate the effects of tree species, tree size and harvesting regime on nutrient removal at harvesting (André et al., 2010).

Publications

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2012 Article de périodique (Journal article) Jonard, Mathieu; Legout, Arnaud; Nicolas, Manuel; Dambrine, Etienne; Nys, Claude; van der Perre, R.; Ponette, Q. et al. (2012). Deterioration of Norway spruce vitality despite a sharp decline in acid deposition : a long-term integrated perspective. In : Global Change Biology (2012), p. 711-725. doi: 10.1111/j.1365-2486.2011.02550.x. http://hdl.handle.net/2078.1/105468. Campioli, M.; Vincke, Caroline; Jonard, Mathieu; Kint, Vincent; Demarée, Gaston; Ponette, Q. et al. (2012). Current status and predicted impact of climate change on forest production and biogeochemistry in the temperate oceanic European zone : review and prospects for Belgium as a case study. In : Journal of Forest Research (-), p. 1-18. doi: 10.1007/s10310-011-0255-8. http://hdl.handle.net/2078.1/105467. 2011 Article de périodique (Journal article) André, Frédéric; Jonard, Mathieu; Jonard, François; Ponette, Quentin (2011). Spatial and temporal patterns of throughfall volume in a deciduous mixed-species stand. In : Journal of Hydrology (30 March 2011), p. 244-254. doi: 10.1016/j.jhydrol.2011.01.037. http://hdl.handle.net/2078/73474. Genet, Astrid; Wernsdörfer, Holger; Mothe, Frédéric; Bock, Jérôme; Ponette, Quentin; Jonard, M.; Saint-André, L. et al. (2011). Des modèles robustes et génériques de Biomasse.Exemple du hêtre. In : Revue Forestière Française (mars-avril 2011), p. 179-190. doi: 10.4267/2042/45203. http://hdl.handle.net/2078.1/96105. Jonard, François; André, Frédéric; Ponette, Quentin; Vincke, Caroline; Jonard, Mathieu (2011). Sap flux density and stomatal conductance of European beech and common oak trees in pure and mixed stands during the summer drought of 2003. In : Journal of Hydrology. doi: 10.1016/j.hydrol.2011.08.032. http://hdl.handle.net/2078.1/90415. Genet, A.; Wernsdörfer, H.; Jonard, Mathieu; Pretzsch, H.; Rauch, M.; Ponette, Q.; Vallet, P. et al. (2011). Ontogeny partly explains the apparent heterogeneity of published biomass equations for Fagus sylvatica in central Europe. In : Forest Ecology and Management (-), p. 1188-1202. doi: 10.1016/j.foreco.2010.12.034. http://hdl.handle.net/2078.1/105500. Communication à un colloque (Conference Paper) Jonard, Mathieu; Legout, A; Nicolas, M.; Dambrine, E.; Nys, C.; Van der Perre, R.; Ponette, Q. et al. (2011). Norway spruce vitality loss despite a sharp decline in acid deposition : how liming may help ?. Final Symposium International Francqui Chair, Antwerpen - Belgium le 15-12-2011. http://hdl.handle.net/2078.1/105501. Gallet-Budynek, A.; Achat , D.L.; Bakker, M.R.; Augusto, L.; Gonzalez, M.; Jonard, M.; Morel, C. et al. (2011). Understanding nutrient limitation in a temperate forest ecosystem : contribution of biological process to soil phosphorus bioavailability. CLIMMANI/INTERFACE Workshop, Keflavik - Iceland du 15-06-2011 au 17-06-2011. http://hdl.handle.net/2078.1/105505. Jonard, Mathieu; André, Frédéric; Jonard, François; Ponette, Quentin (2011). Le mélange chêne-hêtre : fonctionnement et implications pour la gestion. Symposium relatif à la gestion durable de la chênaie, Chimay - Belgique le 14-12-2011. http://hdl.handle.net/2078.1/105503. 2010 Article de périodique (Journal article) Jonard, Mathieu; Augusto, Laurent; Hanert, Emmanuel; Achat, David L.; Bakker, Mark R.; Pellerin, S. et al. (2010). Modeling forest floor contribution to phosphorus supply to maritime pine seedlings in two-layered forest soils. In : Ecological Modelling (2010), p. 927-935. doi: 10.1016/j.ecolmodel.2009.12.017. http://hdl.handle.net/2078.1/34052. Jonard, Mathieu; André, Frédéric; Giot, Pierre; Weissen, Francois; Van der Perre, Raphaele; Ponette, Q. et al. (2010). Thirteen-year monitoring of liming and PK fertilization effects on tree vitality in Norway spruce and European beech stands. In : European Journal of Forest Research (2010), p. 1203-1211. doi: 10.1007/s10342-010-0410-3. http://hdl.handle.net/2078.1/34984. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2010). Biomass and nutrient content of sessile oak (Quercus petraea (Matt.) Liebl.) and beech (Fagus sylvatica L.) stem and branches in a mixed stand in southern Belgium. In : The Science of the total environment (2010), p. 2285-94. doi: 10.1016/j.scitotenv.2010.02.040. http://hdl.handle.net/2078.1/30495. Van der Perre, Raphaèle; Jonard, Mathieu; Nys, Claude; Ponette, Quentin (2010). Impacts de l'amendement sur la réaction des peuplements au stress hydrique. In : Forêt Wallonne (2010), p. 21-37. http://hdl.handle.net/2078.1/70857. Braem, Steve; Jonard, Mathieu; VANWIJNSBERGHE, Stéphane; Defourny, Pierre; Ponette, Quentin (2010). Bilan de santé de la forêt de Soignes bruxelloise. In : Forêt Wallone (2010), p. 15-25. http://hdl.handle.net/2078.1/70855. Communication à un colloque (Conference Paper) Jonard, Mathieu; Augusto, Laurent; Achat, D.L.; Morel, C.; Hanert, Emmanuel; Ponette, Q.; Pellerin, S. et al. (2010). Phosphorous nutrition of forest trees : the role of the forest floor. 4th International Symposium on Phosphorous Dynamics in the Soil-Plant Continuum (ISPDSPC), Beijing - China du 19-09-2010 au 23-09-2010. http://hdl.handle.net/2078.1/105523. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2010). Tree species and mixture effects on leaf litter fall, decomposition and accumulation in common oak and European beech forest. Mixed and Pure Forests in a Changing World, Vila Real - Portugal du 5-10-2010 au 8-10-2010. http://hdl.handle.net/2078.1/105507. 2009 Article de périodique (Journal article) Jonard, Mathieu; Augusto, Laurent; Morel, Christian; Achat, David L.; Saur, Etienne (2009). Forest floor contribution to phosphorus nutrition: experimental data. In : Annals of Forest Science (2009). doi: 10.1051/forest/2009039. http://hdl.handle.net/2078.1/35486. Jonard, Mathieu; André, Frédéric; Dambrine, Etienne; Ponette, Quentin; Ulrich, Erwin (2009). Temporal trends in the foliar nutritional status of the French, Walloon and Luxembourg broad-leaved plots of forest monitoring. In : Annals of Forest Science (2009). doi: 10.1051/forest/2009014. http://hdl.handle.net/2078.1/35553. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2009). Cycle des éléments et évaluation de la fertilité chimique en forêt. In : Forêt Wallonne (2009), p. 60-70. http://hdl.handle.net/2078.1/70853. Heyninck, Christophe; Jonard, Mathieu (2009). Des hêtraies qui poussent plus vite. In : Forêt Wallonne (2009), p. 17-23. http://hdl.handle.net/2078.1/70854. 2008 Article de périodique (Journal article) André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Precipitation water storage capacity in a temperate mixed oak-beech canopy. In : Hydrological Processes : an international journal (2008), p. 4130-4141. doi: 10.1002/hyp.7013. http://hdl.handle.net/2078.1/36313. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Influence of species and rain event characteristics on stemflow volume in a temperate mixed oak-beech stand. In : Hydrological Processes : an international journal (2008), p. 4455-4466. doi: 10.1002/hyp.7048. http://hdl.handle.net/2078.1/36264. Wauters, J. B.; Coudert, S.; Grallien, E.; Jonard, Mathieu; Ponette, Quentin (2008). Carbon stock in rubber tree plantations in Western Ghana and Mato Grosso (Brazil). In : Forest Ecology and Management (2008), p. 2347-2361. doi: 10.1016/j.foreco.2007.12.038. http://hdl.handle.net/2078.1/36564. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2008). Tree species mediated effects on leaf litter dynamics in pure and mixed stands of oak and beech. In : Canadian Journal of Forest Research (2008), p. 528-538. doi: 10.1139/X07-183. http://hdl.handle.net/2078.1/36780. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Spatial and temporal patterns of throughfall chemistry within a temperate mixed oak-beech stand. In : The Science of the total environment (2008), p. 215-28. doi: 10.1016/j.scitotenv.2008.02.043. http://hdl.handle.net/2078.1/11369. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2008). Effects of biological and meteorological factors on stemflow chemistry within a temperate mixed oak-beech stand. In : The Science of the total environment (2008), p. 72-83. doi: 10.1016/j.scitotenv.2007.12.002. http://hdl.handle.net/2078.1/11256. Croisé, Luc; Jonard, Mathieu (2008). Evolution de la nutrition des peuplements vers une carence générale en phosphore ?. In : Rendez-vous techniques hors-série (2008), p. 120-126. http://hdl.handle.net/2078.1/70852. Monographie (Book) Jonard, Mathieu; Ulrich, E.; Giot-Wirgot, Pierre; Dambrine, Etienne (2008). Facteurs explicatifs de la variabilité et évolution temporelle de la nutrition foliaire dans les réseaux de suivi à long terme des écosystèmes forestiers de France (RENECOFOR), de Belgique (Wallonie) et du Grand-Duché de Luxembourg (Période 1993 - 2005). Office National des Forêts : Fontainebleau. p. 67. http://hdl.handle.net/2078.1/71168. 2007 Article de périodique (Journal article) Jonard, Mathieu; André, Frédéric; Jonard, Francois; Mouton, Nicolas; Proces, Pierre; Ponette, Q. et al. (2007). Soil carbon dioxide efflux in pure and mixed stands of oak and beech. In : Annals of Forest Science (2007), p. 141-150. doi: 10.1051/forest:2006098. http://hdl.handle.net/2078.1/37755. André, Frédéric; Jonard, Mathieu; Ponette, Quentin (2007). Influence of meteorological factors and polluting environment on rain chemistry and wet deposition in a rural area near Chimay, Belgium. In : Atmospheric Environment (2007), p. 1426-1439. doi: 10.1016/j.atmosenv.2006.10.013. http://hdl.handle.net/2078.1/37754. Communication à un colloque (Conference Paper) Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2007). Dynamique des litières foliaires en peuplements purs et mélangé de chêne et de hêtre. Atelier Recherche et Gestion Forestière "Forêts mélangées : quels scénarios pour l'avenir ?, Nancy - France du 26-06-2007 au 28-06-2007. http://hdl.handle.net/2078.1/105542. Croisé, L.; Jonard, Mathieu (2007). Evolution de la nutrition des peuplements : vers une carence générale en phosphore ? 15 ans de suivi des écosystèmes forestiers. Résultats, acquis et perspectives de RENECOFOR, Beaune - France du 9-05-2007 au 11-05-2007. http://hdl.handle.net/2078.1/105539. 2006 Article de périodique (Journal article) Jonard, Mathieu; Misson, Laurent; Ponette, Quentin (2006). Long-term thinning effects on the forest floor and the foliar nutrient status of Norway spruce stands in the Belgian Ardennes. In : Canadian Journal of Forest Research (2006), p. 2684-2695. doi: 10.1139/X06-153. http://hdl.handle.net/2078.1/38149. Pairon, Marie; Jonard, Mathieu; Jacquemart, Anne-Laure (2006). Modeling seed dispersal of black cherry, an invasive forest tree: how microsatellites may help?. In : Canadian Journal of Forest Research (2006), p. 1385-1394. doi: 10.1139/X06-018. http://hdl.handle.net/2078.1/38420. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2006). Modeling leaf dispersal in mixed hardwood forests using a ballistic approach. In : Ecology (2006), p. 2306-18. doi: 10.1890/0012-9658(2006)87[2306:MLDIMH]2.0.CO;2. http://hdl.handle.net/2078.1/10713. Giot-Wirgot, Pierre; Ponette, Quentin; Jonard, Mathieu (2006). Le point sur une expérience d'amendements en peuplements d'épicéa, hêtre et chêne. In : Forêt Wallonne (2006), p. 32-37. http://hdl.handle.net/2078.1/70851. 2005 Article de périodique (Journal article) Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2005). Accumulation de litière foliaire en peuplements purs et mélangés de chêne sessile et de hêtre. In : Forêt Wallonne (2005), p. 12-20. http://hdl.handle.net/2078.1/70850. Communication à un colloque (Conference Paper) Wauters, J.B.; Bemelmans, Daniel; Bortolazzo, R.; Coudert, S.; Difle, S.; Giot, P.; Jonard, M.; Ponette, Q. et al. (2005). Measurement and prediction of carbon content in rubber tree (Hevea brasiliensis) plantations. International Natural Rubber Conference, Kottayan, Kerala - India du 6-11-2005 au 8-11-2005. http://hdl.handle.net/2078.1/105541. 2004 Article de périodique (Journal article) Jonard, Mathieu; Ponette, Quentin; Giot-Wirgot, Pierre (2004). Impact de l'intensité d'éclaircie sur l'humus et sur les teneurs foliaires en pessière. In : Forêt Wallonne (2004), p. 35-39. http://hdl.handle.net/2078.1/70849. Communication à un colloque (Conference Paper) Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2004). Impact du mélange sur la dynamique des litières : dispersion des feuilles. Séminaire Forêts Hétérogènes, Nancy, France du 22-06-2004 au 23-06-2004. http://hdl.handle.net/2078.1/105469. Jonard, Mathieu; André, Frédéric; Ponette, Quentin (2004). Soil carbon dioxide efflux in a mixed stand of oak and beech : abiotic factors and species effects. International Symposium : forest soils under global and local changes, Bordeaux - France du 15-09-2004 au 18-09-2004. http://hdl.handle.net/2078.1/105544. 2001 Article de périodique (Journal article) Misson, L; de Warnaffe, GD; Jonard, Mathieu (2001). Effects of fertilization on the vascular ground vegetation of European beech (Fagus sylvatica L.) and sessile oak (Quercus petraea (Matt.) Lieb.) stands. In : Annals of Forest Science (2001), p. 829-842. doi: 10.1051/forest:2001166. http://hdl.handle.net/2078.1/42399.