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Author |
Vleminckx, J.; Bauman, D.; Demanet, M.; Hardy, O.J.; Doucet, J.-L.; Drouet, T. |
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Title |
Past human disturbances and soil fertility both influence the distribution of light-demanding tree species in a Central African tropical forest |
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Journal Article |
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Year |
2020 |
Publication |
Journal of Vegetation Science |
Abbreviated Journal |
J. Veg. Sci. |
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Volume |
31 |
Issue |
3 |
Pages |
440-453 |
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Keywords |
light-demanding species; moist tropical forests; past human disturbances; shade-bearer species; soil charcoal abundance; soil properties; tree community assemblages; wood-specific gravity; anthropogenic effect; forest canopy; forest ecosystem; shifting cultivation; soil fertility; soil property; tree; tropical forest; Cameroon |
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Questions: In vast areas of Central African forests, the upper canopy is presently dominated by light-demanding tree species. Here, we confront three hypotheses to explain this dominance: (a) these species have expanded their distribution because of widespread past slash-and-burn activities, as suggested by important charcoal amounts recorded in the soils of the region; (b) their abundance is rather explained by soil properties, as this guild establishes preferentially on favourable physico-chemical conditions for rapid growth; (c) soil properties have been substantially influenced by past human disturbances and those two effects cannot be disentangled. Location: Pallisco-CIFM logging concession, southeastern Cameroon (300,000 ha). Methods: We quantified soil charcoal abundance and measured ten soil variables at the basis of 60 target trees that belonged to a list of three long-living pioneer light-demanding (LLP) and four shade-bearer (SB) species. We identified all stems with a diameter at breast height (DBH) ≥ 20 cm within a distance of 15 m around each target tree. Species were characterised by their wood-specific gravity (WSG), which reflected their light requirement. Multiple regression models were used to quantify and test the relative effects of charcoal abundance and soil variables on the mean WSG of the 60 tree communities, as well as the abundance of three guilds: LLP, SB, and non-pioneer light demanders (NPLD). Results: The mean WSG was the only response variable significantly explained by soil variables and charcoal abundance combined. It was significantly negatively associated with soil calcium and Mg content and with charcoal abundance, with soil and charcoal influencing the mean WSG independently. Conclusion: Our study provides evidence that past human disturbances and soil fertility have independently promoted the establishment of light-demanding species in western Central African forests, thereby shedding light on tree community assembly rules in these ecosystems which remain considerably understudied compared to the tropical forests of other continents. © 2020 International Association for Vegetation Science |
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Forest is life, TERRA Teaching and Research Centre, Université de Liège – Gembloux Agro-Bio Tech, Gembloux, Belgium |
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Wiley-Blackwell |
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11009233 (Issn) |
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EcoFoG @ webmaster @ |
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970 |
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Schmitt, Sylvain ; Tysklind, Niklas ; Hérault, Bruno ; Heuertz, Myriam |
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Title |
Topography drives microgeographic adaptations of closely related species in two tropical tree species complexes |
Type |
Journal Article |
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Year |
2021 |
Publication |
Molecular Ecology |
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Volume |
30 |
Issue |
20 |
Pages |
5080-5093 |
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Closely related tree species that grow in sympatry are abundant in rainforests. However, little is known of the ecoevolutionary processes that govern their niches and local coexistence. We assessed genetic species delimitation in closely related sympatric species belonging to two Neotropical tree species complexes and investigated their genomic adaptation to a fine-scale topographic gradient with associated edaphic and hydrologic features. Combining LiDAR-derived topography, tree inventories, and single nucleotide polymorphisms (SNPs) from gene capture experiments, we explored genome-wide population genetic structure, covariation of environmental variables, and genotype-environment association to assess microgeographic adaptations to topography within the species complexes Symphonia (Clusiaceae), and Eschweilera (Lecythidaceae) with three species per complex and 385 and 257 individuals genotyped, respectively. Within species complexes, closely related tree species had different realized optima for topographic niches defined through the topographic wetness index or the relative elevation, and species displayed genetic signatures of adaptations to these niches. Symphonia species were genetically differentiated along water and nutrient distribution particularly in genes responding to water deprivation, whereas Eschweilera species were genetically differentiated according to soil chemistry. Our results suggest that varied topography represents a powerful driver of processes modulating tropical forest biodiversity with differential adaptations that stabilize local coexistence of closely related tree species. |
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Wiley |
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EcoFoG @ webmaster @ |
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1045 |
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Coutant, Opale ; Richard-Hansen, Cecile ; de Thoisy, Benoit ; Decotte, Jean-Baptiste ; Valentini, Alice ; Dejean, Tony ; Vigouroux, Régis ; Murienne, Jérôme ; Brosse, Sébastien |
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Title |
Amazonian mammal monitoring using aquatic environmental DNA |
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Journal Article |
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Year |
2021 |
Publication |
Molecular Ecology Resources |
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Volume |
21 |
Issue |
6 |
Pages |
1875-1888 |
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Environmental DNA (eDNA) metabarcoding has emerged as one of the most efficient methods to assess aquatic species presence. While the method can in theory be used to investigate nonaquatic fauna, its development for inventorying semi-aquatic and terrestrial fauna is still at an early stage. Here we investigated the potential of aquatic eDNA metabarcoding for inventorying mammals in Neotropical environments, be they aquatic, semi-aquatic or terrestrial. We collected aquatic eDNA in 96 sites distributed along three Guianese watersheds and compared our inventories to expected species distributions and field observations derived from line transects located throughout French Guiana. Species occurrences and emblematic mammalian fauna richness patterns were consistent with the expected distribution of fauna and our results revealed that aquatic eDNA metabarcoding brings additional data to line transect samples for diurnal nonaquatic (terrestrial and arboreal) species. Aquatic eDNA also provided data on species not detectable in line transect surveys such as semi-aquatic, aquatic and nocturnal terrestrial and arboreal species. Although the application of eDNA to inventory mammals still needs some developments to optimize sampling efficiency, it can now be used as a complement to traditional surveys. |
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Wiley |
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EcoFoG @ webmaster @ |
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1015 |
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Urbina, Ifigenia ; Grau, Oriol ; Sardans, Jordi ; Margalef, Olga ; Peguero, Guillermo ; Asensio, Dolores ; Llusia, Joan ; Ogaya, Roma ; Gargallo-Garriga, Albert ; Van Langenhove, Leandro ; Verryckt, Lore T. ; Courtois, Elodie A. ; Stahl, Clement ; Soong, Jennifer L. ; Chave, Jérome ; Hérault, Bruno ; Janssens, Ivan A. ; Sayer, Emma ; Penuelas, Josep |
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Title |
High foliar K and P resorption efficiencies in old-growth tropical forests growing on nutrient-poor soils |
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Journal Article |
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Year |
2021 |
Publication |
Ecology and Evolution |
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Volume |
11 |
Issue |
13 |
Pages |
8969-8982 |
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Resorption is the active withdrawal of nutrients before leaf abscission. This mechanism represents an important strategy to maintain efficient nutrient cycling; however, resorption is poorly characterized in old-growth tropical forests growing in nutrient-poor soils. We investigated nutrient resorption from leaves in 39 tree species in two tropical forests on the Guiana Shield, French Guiana, to investigate whether resorption efficiencies varied with soil nutrient, seasonality, and species traits. The stocks of P in leaves, litter, and soil were low at both sites, indicating potential P limitation of the forests. Accordingly, mean resorption efficiencies were higher for P (35.9%) and potassium (K; 44.6%) than for nitrogen (N; 10.3%). K resorption was higher in the wet (70.2%) than in the dry (41.7%) season. P resorption increased slightly with decreasing total soil P; and N and P resorptions were positively related to their foliar concentrations. We conclude that nutrient resorption is a key plant nutrition strategy in these old-growth tropical forests, that trees with high foliar nutrient concentration reabsorb more nutrient, and that nutrients resorption in leaves, except P, are quite decoupled from nutrients in the soil. Seasonality and biochemical limitation played a role in the resorption of nutrients in leaves, but species-specific requirements obscured general tendencies at stand and ecosystem level. |
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Wiley |
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EcoFoG @ webmaster @ |
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1011 |
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Quéméré, Erwan ; Aucourt, Marie ; Troispoux, Valérie ; Brosse, Sébastien ; Murienne, Jérôme ; Covain, Raphael ; Le Bail, Pierre-Yves ; Olivier, Jean ; Tysklind, Niklas ; Galan, Maxime |
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Unraveling the dietary diversity of Neotropical top predators using scat DNA metabarcoding: A case study on the elusive Giant Otter |
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Journal Article |
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Year |
2021 |
Publication |
Environmental DNA |
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3 |
Issue |
5 |
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889-900 |
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Large carnivores play a pivotal regulating role in maintaining healthy and balanced ecosystems; however, most of them are rare and elusive, and knowledge about their resource consumption is scarce. Traditional methods based on morphological identification of undigested remains are labor intensive and often not sufficiently accurate, leading to errors and biased ecological inferences. Here, we developed a multi-marker DNA metabarcoding approach to analyze the dietary diversity of giant otters (Pteronura brasiliensis) from fecal DNA while controlling predator species identity. We combined two mitochondrial markers, 12S rRNA and cytochrome c oxidase 1 (COI) gene, that target the full range of potential vertebrate and invertebrate prey. We compiled a local reference database of DNA barcodes for most potentially ingested fish, which were used to evaluate the specificity of the metabarcoding primers in silico. Most prey are identified at the species level (>90%) and the dietary profiles provided independently by the two markers are highly similar, whether in terms of list of prey or frequency of occurrences, hence validating the approach. We detected a higher number of rare fish prey with the 12S primers that amplified solely Teleost species while the degenerate COI primers revealed non-fish prey (e.g., amphibians, snakes, birds, and earthworms) and confirmed predator species identity. This study demonstrated that scat DNA metabarcoding is particularly useful to provide in-depth information on elusive carnivorous dietary profile. Our methodology opens up new opportunities to understand how top carnivores diet cope with the effects of anthropogenic alteration of ecosystems and identify conflicts with humans and livestock. |
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Wiley |
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EcoFoG @ webmaster @ |
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1054 |
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Author |
Bleron, L.; Duchanois, G.; Thibaut, B. |
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Title |
Characteristic properties of embedding strength for the nailing of the gonfolio rose (Qualea rosea Aubl.) |
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Journal Article |
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Year |
2008 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
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62 |
Issue |
1 |
Pages |
86-90 |
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Keywords |
embedding strength; Eurocode V; nail |
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Experimental results are presented with single nail joints of gonfolo rose which were loaded at different grain angles and compared to results obtained by Eurocode V. A wide range of embedding strength tests was conducted. The embedding behaviour across the grain was also investigated with a specific test apparatus. The results were analysed and modelled in terms of strength. Initial loading and unloading stiffness of the timber have been taken into account. The embedment strength of the nails varied according to the angle between the direction of loading and that to the grain. This work is part of a larger research project to establish a computer program for the prediction of stiffness and limit strengths of all timber-to-timber and timber-to-steel joints. |
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[Bleron, Laurent] LABOMAP ENSAM, F-71250 Poret De Paris, Cluny, France, Email: laurent.bleron@cluny.ensam.fr |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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Notes |
ISI:000252041400013 |
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no |
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EcoFoG @ eric.marcon @ |
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144 |
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Marchal, R.; Mothe, F.; Denaud, L.E.; Thibaut, B.; Bleron, L. |
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Cutting forces in wood machining – Basics and applications in industrial processes. A review COST Action E35 2004-2008: Wood machining – micromechanics and fracture |
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Journal Article |
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Year |
2009 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
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Volume |
63 |
Issue |
2 |
Pages |
157-167 |
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Keywords |
cutting forces; online control; peeling process; physico-mechanical model; sound; vibrations; wood industry; wood machining |
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Abstract |
The data available in the literature concerning wood cutting forces permits to build models or to simulate the main wood machining processes ( milling, sawing, peeling, etc.). This approach contributes to a better understanding of formation of wood surfaces and chips and the data may be helpful to optimise cutting geometry, reduce tool wear, improve tool material, and to size tool-machines. The models may also be useful for industrial application in two ways: ( 1) providing data to optimise the settings for a given operation ( batch approach), and ( 2) building predictive models that could be the basis of an online control system for the machining processes ( interactive approach). A prerequisite for this is that numerous machining tests on different wood materials are performed based on experiences with different kind of tools and experimental devices. With a focus on potential industrial applications, the emphasis of this review was on the wood peeling process, which is a very demanding special case of wood cutting. Although not so many industrial machines are equipped with expensive force sensors, there is a lot of high quality information available about cutting forces which may be useful to improve the scientific or technological knowledge in wood machining. Alternative parameters, such as vibration or sound measurements, appear to be promising substitutes in the praxis, particularly to feed online control systems of any wood cutting process. |
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[Marchal, Remy; Bleron, Laurent] Arts & Metiers ParisTech, LABOMAP, F-71250 Cluny, France, Email: remy.marchal@cluny.ensam.fr |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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ISI:000263932200006 |
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EcoFoG @ eric.marcon @ |
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205 |
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Clair, B.; Jaouen, G.; Beauchene, J.; Fournier, M. |
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Mapping radial, tangential and longitudinal shrinkages and relation to tension wood in discs of the tropical tree Symphonia globulifera |
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Journal Article |
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Year |
2003 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
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Volume |
57 |
Issue |
6 |
Pages |
665-671 |
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Keywords |
drying shrinkage; tension wood; Symphonia globulifera L. f. |
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Abstract |
A method for measuring shrinkage resulting from drying in the three anisotropic directions is developed and tested. Measurements are performed on sawn discs, a technique which simplifies preparation and enables large numbers of measurements. Shrinkage values can be represented as a map of the disc surface. The results indicate that comparisons between shrinkage distribution and tension wood distribution on the discs show a clear relationship and can be measured with relatively high accuracy in reference to the shrinkage map. In the long term, this method could be useful in the timber industry as a means for choosing the direction in which logs are cut depending on their type of wood composition. |
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CIRAD ENGREF INRA, UMR Ecol Forets Guyane, Kourou 97379, French Guiana |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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ISI:000186257800016 |
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EcoFoG @ eric.marcon @ |
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243 |
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Almeras, T.; Gril, J.; Yamamoto, H. |
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Title |
Modelling anisotropic maturation strains in wood in relation to fibre boundary conditions, microstructure and maturation kinetics |
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Journal Article |
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Year |
2005 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
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Volume |
59 |
Issue |
3 |
Pages |
347-353 |
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anisotropy; boundary conditions; cell-wall maturation; growth strain; multilayer model; residual stress; wood fibre |
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A generalisation of existing mechanical models is proposed to account for the relation between wood macroscopic properties and fibre microstructure and chemical composition. It is applied to understanding of the origin of anisotropic maturation strains measured at the outermost surface of the xylem. Various assumptions are considered for boundary conditions of the fibre during the progressive maturation process and are applied to experimental data from the literature. Assumptions that the fibre is fully restrained in displacement, or fully unrestrained or unrestrained in the transverse direction only are all incompatible with observations. Indeed, within the tree, the fibre is restrained in the longitudinal and tangential directions, but unrestrained in the radial direction towards the bark. Mixed boundary conditions must be introduced to correctly simulate both longitudinal and tangential maturation strains. In the context of an analytical axisymmetric model, this is estimated by considering a parameter of partial release of tangential stress during maturation. Consistence with data and with finite element computation in the case of a square fibre confirmed that, because of the unrestrained radial condition, a large part of the tangential maturation stress is released in situ. |
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Address |
Nagoya Univ, Grad Sch Bioagr Sci, Lab Biomat Phys, Chikusa Ku, Nagoya, Aichi 4648601, Japan, Email: tancrede@nuagr1.agr.nagoya-u.ac.jp |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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ISI:000228828800016 |
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EcoFoG @ eric.marcon @ |
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256 |
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Author |
Clair, B.; Ruelle, J.; Thibaut, B. |
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Title |
Relationship between growth stress, mechanical-physical properties and proportion of fibre with gelatinous layer in chestnut (Castanea sativa Mill.) |
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Journal Article |
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Year |
2003 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
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Volume |
57 |
Issue |
2 |
Pages |
189-195 |
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Keywords |
growth stress; longitudinal Young's modulus; shrinkage; normal wood; tension wood; gelatinous layer; Castanea Sativa |
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A range of mechanical and physical properties were determined for 96 specimens of chestnut wood and for wood types ranging from compression to tension wood; tests included (1) growth stress, (2) longitudinal Young's modulus in green and air-dried states (3) shrinkage in longitudinal and tangential directions. Anatomical observations permitted determination of the proportion of fibres with a gelatinous layer. The influence of these atypical fibres on macroscopic wood properties is examined and discussed. A basic model is proposed to determine their properties in theoretically isolated conditions. |
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Address |
Univ Montpellier 2, Lab Mecan & Genie Civil, F-34095 Montpellier 5, France, Email: clair@lmgc.univ-montp2.fr |
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WALTER DE GRUYTER & CO |
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0018-3830 |
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ISI:000181797800011 |
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EcoFoG @ eric.marcon @ |
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274 |
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