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A Linking Test that establishes if groundwater recharge can be determined by optimising vegetation parameters against soil moisture / Joseph Alexander Paul Pollacco in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 7 (October - November 2008) . - n° 702 Titre : A Linking Test that establishes if groundwater recharge can be determined by optimising vegetation parameters against soil moisture Titre original : Un Test de Liaison qui établit si la recharge des eaux souterraines peut être quantifiée en optimisant les paramètres de végétation grâce aux profils d'humidité du sol Type de document : Article/Communication Auteurs : Joseph Alexander Paul Pollacco, Auteur ; Isabelle Braud, Auteur ; Rafael Angulo-Jaramillo, Auteur ; Bernard Saugier, Auteur Année de publication : 2008 Article en page(s) : n° 702 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] eau souterraine [Termes IGN] humidité du sol [Termes IGN] hydrodynamique Résumé : (auteur) The impact of afforestation/deforestation on groundwater recharge can be predicted by using one-dimensional soil-vegetation water flow models based on Richards' equation. However simulations depend upon parameters that are not easily measurable. Pollacco et al. (2008) showed that the hydraulic parameters can be determined, if the vegetation parameters are known, by fitting simulated time series of soil moisture profiles to those measured in situ. This paper presents a case study to determine if the interception and crop factor parameters can tentatively be calibrated by fitting soil moisture profiles. Synthetic data were used and the other vegetation parameters and the soil hydraulic parameters were assumed to be known. We applied and improved the Linking Test developed by Pollacco et al. (2008) to look for links between the parameters that need to be calibrated, and thus to investigate whether inverse modelling is feasible, which depends on the accuracy of the calibration data. $\bullet$ The Linking Test established that interception and evapotranspiration parameters are linked and, therefore, uncertainty on interception compensates for uncertainty on evapotranspiration. Thus in spite of a good match between observed and simulated soil moisture data, inverse modelling is unfeasible. This is true even if the interception or the crop factor parameters are known, because an error on interception or evapotranspiration will be compensated by an error on groundwater recharge without affecting soil moisture. This paper recommends that vegetation parameters should not be calibrated by optimisation against soil moisture data. Numéro de notice : A2008-689 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2008046 Date de publication en ligne : 20/09/2008 En ligne : https://doi.org/10.1051/forest:2008046 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71434 [article]

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IFN-DIR-P000234	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Ten years of fluxes and stand growth in a young beech forest at Hesse, North-eastern France / André Granier in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 7 (October - November 2008) . - n° 13 Titre : Ten years of fluxes and stand growth in a young beech forest at Hesse, North-eastern France Titre original : Dix années de mesures de flux et de croissance dans une jeune hêtraie du nord-est de la France, en forêt de Hesse Type de document : Article/Communication Auteurs : André Granier, Auteur ; Nathalie Bréda, Auteur ; Bernard Longdoz, Auteur ; Patrick Gross, Auteur ; Jérôme Ngao, Auteur Année de publication : 2008 Article en page(s) : n° 13 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] bioclimatologie [Termes IGN] biomasse forestière [Termes IGN] croissance des arbres [Termes IGN] dioxyde de carbone [Termes IGN] évapotranspiration [Termes IGN] Fagus sylvatica [Termes IGN] France (administrative) [Termes IGN] Hesse, forêt de (Meuse) [Termes IGN] hêtraie [Termes IGN] production primaire brute [Termes IGN] stress hydrique [Termes IGN] variation saisonnière [Vedettes matières IGN] Sylviculture Résumé : (auteur) Water and carbon fluxes, as measured by eddy covariance, climate, soil water content, leaf area index, tree biomass, biomass increment (BI), litter fall and mortality were monitored for 10 successive years in a young beech stand in Hesse forest (north-eastern France) under contrasting climatic and management conditions. Large year-to-year variability of net carbon fluxes (NEE) and to a lesser extent, of tree growth was observed. The variability in NEE (coefficient of variation, CV = 44%) was related to both gross primary production (GPP) and to variations in total ecosystem respiration (TER), each term showing similar and lower interannual variability (CV = 14%) than NEE. Variation in the annual GPP was related to: (i) the water deficit duration and intensity cumulated over the growing season, and (ii) the growing season length, i.e. the period of carbon uptake by the stand. Two thinnings occurring during the observation period did not provoke a reduction in either GPP, water fluxes, or in tree growth. Interannual variation of TER could not be explained by any annual climatic variables, or LAI, and only water deficit duration showed a poor correlation. Annual biomass increment was well correlated to water shortage duration and was significantly influenced by drought in the previous year. The relationship between annual NEE and biomass increment (BI) was poor: in some years, the annual carbon uptake was much higher and in others much lower than tree growth. However this relationship was much stronger and linear (r2 = 0.93) on a weekly to monthly time-scale from budburst to the date of radial growth cessation, indicating a strong link between net carbon uptake and tree growth, while carbon losses by respiration occurring after this date upset this relationship. Despite the lack of correlation between annual data, the NEE and BI cumulated over the 10 years of observations were very close. On the annual time-scale, net primary productivity calculated from eddy fluxes and from biological measurements showed a good correlation. Numéro de notice : A2008-690 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2008052 Date de publication en ligne : 24/10/2008 En ligne : https://doi.org/10.1051/forest:2008052 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71436 [article]

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Has global change induced divergent trends in radial growth of Pinus sylvestris and Pinus halepensis at their bioclimatic limit? The example of the Sainte-Baume forest (south-east France) / Bruno Vila in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 7 (October - November 2008) . - n° 709 Titre : Has global change induced divergent trends in radial growth of Pinus sylvestris and Pinus halepensis at their bioclimatic limit? The example of the Sainte-Baume forest (south-east France) Titre original : Les changements globaux ont-ils induit des tendances de croissance radiale opposées chez Pinus sylvestris et Pinus halepensis à leur limite bioclimatique ? L'exemple de la forêt de la Sainte-Baume Type de document : Article/Communication Auteurs : Bruno Vila, Auteur ; Michel Vennetier, Auteur ; Christian Ripert, Auteur ; Olivier Chandioux, Auteur ; Eryuan Liang, Auteur ; Frédéric Guibal, Auteur ; Franck Torre, Auteur Année de publication : 2008 Article en page(s) : n° 709 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] croissance des arbres [Termes IGN] France (administrative) [Termes IGN] limite bioclimatique [Termes IGN] Pinus halepensis [Termes IGN] Pinus sylvestris [Termes IGN] Sainte-Baume, forêt de la (Bouches-du-Rhône/Var) [Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) It is agreed that climate (precipitation and temperature) influences the distribution of plant species. Near the margins of a species' natural range, climate becomes limiting to physiological processes. There, climate change may be expected to have a significant impact on tree growth and the species' ranges may be altered. In order to assess what influence climate change could exert on the distribution of pine species at their margin, radial growth trends in ring-width chronologies over the last century were analysed. In the French Mediterranean area where climate change is characterized by increased temperature, forest plots were selected along an altitudinal transect on the north-facing slope of the Sainte-Baume mountain (Bouches-du-Rhône, France) where the ranges of Pinus sylvestris and Pinus halepensis overlap. Two growth patterns were identified. For P. halepensis, radial growth has increased at all altitudes indicating that climate change has improved growth conditions of this species near the margin of its ecological range. For P. sylvestris, radial growth has increased only at low altitudes and even decreased at high altitudes. It must be deduced that the growth changes observed cannot be generalised either at the species level or at the geographical level and must be interpreted with great caution. Numéro de notice : A2008-691 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2008048 Date de publication en ligne : 20/09/2008 En ligne : https://doi.org/10.1051/forest:2008048 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71441 [article]

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A new bioclimatic model calibrated with vegetation for Mediterranean forest areas / Michel Vennetier in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 7 (October - November 2008) . - n° 10 Titre : A new bioclimatic model calibrated with vegetation for Mediterranean forest areas Titre original : Un nouveau modèle bioclimatique calibré à l'aide de la flore pour les milieux forestiers méditerranéens Type de document : Article/Communication Auteurs : Michel Vennetier, Auteur ; Christian Ripert, Auteur ; Eric Maille, Auteur ; Laurence Blanc, Auteur ; Franck Torre, Auteur ; Philip Roche, Auteur ; Thierry Tatoni, Auteur ; Jean-Jacques Brun, Auteur Année de publication : 2008 Article en page(s) : n° 10 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] changement climatique [Termes IGN] forêt méditerranéenne [Termes IGN] inventaire de la végétation [Termes IGN] modèle statistique [Termes IGN] modélisation de la forêt [Termes IGN] Provence-Alpes-Côte d'Azur [Termes IGN] régression des moindres carrés partiels [Termes IGN] stress hydrique Résumé : (auteur) Water availability is one of the main factors explaining flora composition and growth in Mediterranean regions, where it may decline with climate change. Our goal was to develop a model for forest site assessment in Mediterranean environments, focusing on water availability to assess potential vegetation composition and productivity in any places, whatever their level of disturbance. We designed a statistical model, using global climatic and geographic variables, as well as detailed local topographic and edaphic variables, to compute a bioclimatic index for Mediterranean forest environments. This model was calibrated in France with a flora index from 325 old forests. The model explained 80.3% of the flora index variance. The method fills a gap in existing models, bridging scales from the region to forest sites. Beyond its theoretical aspect, it was designed to allow practical tools to be derived from it for decision-making and management, such as the assessment of climate change impact on vegetation, and of forest productivity. Its development and adaptation is possible in other Mediterranean regions, and in any region where water is one of the main limiting factors. Numéro de notice : A2008-654 Affiliation des auteurs : non IGN Thématique : FORET/MATHEMATIQUE Nature : Article DOI : 10.1051/forest:2008050 Date de publication en ligne : 24/10/2008 En ligne : https://doi.org/10.1051/forest:2008050 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71443 [article]

Exemplaires(1)

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IFN-DIR-P000234	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Ultrasonic tomography of green wood using a non-parametric imaging algorithm with reflected waves / Loïc Brancheriau in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 7 (October - November 2008) . - n° 712 Titre : Ultrasonic tomography of green wood using a non-parametric imaging algorithm with reflected waves Titre original : Tomographie ultrasonore de bois vert par reconstruction d'image non paramétrique en réflexion Type de document : Article/Communication Auteurs : Loïc Brancheriau, Auteur ; Philippe Lasaygues, Auteur ; Eric Debieu, Auteur ; Jean Pierre Lefebvre, Auteur Année de publication : 2008 Article en page(s) : n° 712 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] approximation [Termes IGN] Picea abies [Termes IGN] tomographie [Termes IGN] ultrason Résumé : (auteur) Ultrasonic computed tomography in reflection was used to assess the integrity of green wood. Qualitative reflectivity images were obtained from back-scattered measurements by reflection tomography, like ultrasound in medical applications. The reconstruction algorithm was designed using, in particular, a linear approximation of the forward problem (Born approximation) and based on the assumption that a transversal cross section of wood is isotropic. The experimental device was composed of only one rotating emitter–receiver transducer to record and compute the projections. In this specific case, a tomographic projection was directly associated with a recorded signal. The qualitative aspect of this imaging technique was validated by performing a numerical simulation and tested on a small diameter green wood (Picea abies) log. The images obtained were geometrically accurate considering the internal inclusions. It was, however, not possible in the simulation to differentiate the object shape from the background (coupling medium) because the reflectivity value associated with the object was too low. The image obtained with the spruce sample mainly showed the position of the bark as indicated by a very high contrast area. The proportion of transmitted energy was, however, sufficient to reconstruct the artificial inclusion within the sample. Numéro de notice : A2008-693 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.1051/forest:200851 Date de publication en ligne : 20/09/2008 En ligne : https://doi.org/10.1051/forest:200851 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71444 [article]

Exemplaires(1)

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IFN-DIR-P000234	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

A quantitative assessment of the ecological value of sycamore maple habitats in the French Alps / Yoan Paillet in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 7 (October - November 2008) . - n° 713 Titre : A quantitative assessment of the ecological value of sycamore maple habitats in the French Alps Titre original : Une évaluation quantitative de la valeur écologique des érablaies de versant dans les Alpes françaises Type de document : Article/Communication Auteurs : Yoan Paillet, Auteur ; Yoan Paillet, Auteur ; Frédéric Archaux, Auteur ; Vincent Breton, Auteur ; Jean-Jacques Brun, Auteur Année de publication : 2008 Article en page(s) : n° 713 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Acer pseudoplatanus [Termes IGN] Alpes (France) [Termes IGN] Chartreuse, massif de la (Préalpes ; France) [Termes IGN] conservation de la flore [Termes IGN] indicateur biologique [Termes IGN] politique de conservation (biodiversité) [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Naturalness is an important criterion in nature conservation assessment. At the stand-level, such assessment must be based on objective and quantifiable indicators measurable in the field. In this study, we used a multi-criterion method based on the difference between a Natural Value (NV) and a Conservation Value (CV) to quantify the ecological value of sycamore maple patches compared to the surrounding mixed forests. Indeed, sycamore habitats are considered of high natural and conservation value both by naturalists and by European institutions. Our results showed that the natural and conservation values were significantly higher for the sycamore forests than for the surrounding mixed forests and that this assessment did not depend on abiotic factors such as elevation or aspect. Actually, naturalness of structure and composition in the sycamore habitats was higher than for mixed forests and allowed us to differentiate between the two habitats. Managers could easily use this method in order to assess the ecological value of small habitats in mountainous regions and to provide guidelines for close-to-nature and conservation-related silviculture. Numéro de notice : A2008-694 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1051/forest:2008058 Date de publication en ligne : 24/10/2008 En ligne : https://doi.org/10.1051/forest:2008058 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71445 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-DIR-P000234	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt