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Quantifying intra-annual dynamics of carbon sequestration in the forming wood: a novel histologic approach / Anjy Andrianantenaina in Annals of Forest Science, Vol 76 n° 3 (September 2019)  

Public [article]  inAnnals of Forest Science > Vol 76 n° 3 (September 2019) . - n° 62 Titre : Quantifying intra-annual dynamics of carbon sequestration in the forming wood: a novel histologic approach Type de document : Article/Communication Auteurs : Anjy Andrianantenaina, Auteur ; Cyrille B.K. Rathgeber, Auteur ; Gonzalo Péres-de-Lis, Auteur ; Henri E. Cuny , Auteur ; Julien Ruelle, Auteur Année de publication : 2019 Projets : ARBRE / AgroParisTech (2007 -) Article en page(s) : n° 62 Note générale : bibliographie This work was supported by a grant overseen by the French National Research Agency (ANR) as part of the “Investissements d’Avenir” program (ANR-11-LABX-0002-01, Lab of Excellence ARBRE), and by the National Institute of Agricultural Research (INRA Grand-Est Nancy) with a doctoral fellowship granted to the first author (CJS, “Contrat Jeune Scientifique”). Langues : Anglais (eng) Descripteur : [Termes IGN] analyse d'image numérique [Termes IGN] Angiosperme [Termes IGN] biomasse aérienne [Termes IGN] croissance végétale [Termes IGN] densité du bois [Termes IGN] Hesse, forêt de (Meuse) [Termes IGN] microscope électronique [Termes IGN] Picea abies [Termes IGN] puits de carbone [Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) This study presents a novel histologic approach to quantify the intra-annual dynamics of carbon sequestration in forming wood. This innovative approach, based on repeated measurements of xylem apparent density, is more direct, and more accurate than the previously published cellular-based approach. Moreover, this new approach, which was tested here on softwoods, is also applicable to hardwoods without any modification. Context : Forest ecosystems are key players of the terrestrial carbon cycle. Indeed, wood represents the principal carbon pool of terrestrial biomass, accumulated in trees through cambial activity. Aims : Here, we present a novel, simple, and fast approach to accurately estimate the intra-annual dynamics of aboveground woody biomass production based on image analysis of forming xylem sections. Methods : During the 2015 growing season, we weekly collected wood samples (microcores) containing the forming xylem on seven Norway spruces (Picea abies (L.) Karst), grown in Hesse forest (North-East France). The microcores were prepared to allow the observation of the forming tissues with an optical microscope. Xylem apparent density and radial increment were then measured directly on images of the histological sections. In order to compare our “histologic approach” with the previously published “cellular approach,” we also counted the number of tracheids in each differentiation zones, and measured the tracheid dimensions all along the last-formed tree ring. Results : The two approaches yielded comparable meaningful results, describing xylem size increase and aboveground woody biomass production as bell-shaped curves culminating in May and June respectively. However, the histologic approach provided a shorter time lag between xylem size increase and biomass production than the cellular one. Conclusion : Better quantification of the shift between stem growth in size and in biomass will require addressing the knowledge gap regarding lignin deposition kinetics. Nevertheless, our novel histologic approach is simpler and more direct than the cellular one, and may open the way to a first quantification of intra-annual dynamics of woody biomass production in angiosperms, where the cellular approach is hardly applicable. Numéro de notice : A2019-650 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s13595-019-0846-7 En ligne : https://doi.org/10.1007/s13595-019-0846-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97454 [article]

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]

Exemplaires(1)

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