| Records |
| Author |
Sist, P.; Blanc, L.; Mazzei, L.; Baraloto, C.; Aussenac, R. |
| Title |
Current knowledge on overall post-logging biomass dynamics in Northern Amazonian forests |
Type |
Journal Article |
| Year |
2012 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois Forets Tropiques |
Volume  |
66 |
Issue |
314 |
Pages |
41-49 |
| Keywords |
Above ground-biomass; Amazonian rainforests; Logging impact; Silviculture |
| Abstract |
This article presents the effects of logging on the dynamics of above-ground biomass from the results of the post-logging study within two forests: Cikel in Eastern Pará, Brazil and Paracou in French Guiana. The main objective is to compare the impact of commercial logging on the regeneration of the aboveground biomass in these forests whose characteristics differ in terms of structure and growth. In both sites, the intensity of exploitation is a key factor in determining the loss of biomass and the time required for its regeneration. In Paracou, the regeneration of biomass lost during conventional logging of 10 trees per hectare takes 45 years and more than 100 years when operating with higher intensity (21 trees/ha ). In Cikel the forest biomass regenerates after 49 years harvesting 6 trees/ha and that takes 87 years after removal of 8 trees/ha. This regeneration needs similar time on both sites but with lower logging intensity at Cikel, in which felled trees are larger with a greater biomass than those of Paracou. This post-logging study has established a direct correlation of the dynamics of the biomass with the initial structure of the forest, as well as with the parameters of forest dynamics: mortality, growth and recruitment. The accumulation of biomass by the tree growth of the two remaining stands is a key parameter for the net carbon storage, while the contribution of recruitment in Paracou becomes significant only after 10 years after felling. Therefore in view to improve the growth of residual trees, it is compulsory to apply adequate silvicultural treatments such as selective thinning or removal of vines. While the two forests are geographically close enough, their regenerative abilities differ and because of the significant difference in size of the trees, the forest could tolerate more intensive harvesting in French Guiana. |
| Address |
Université Antilles-Guyane Cayenne, Guyane, France |
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0006579x (Issn) |
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Export Date: 5 June 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: Cirad UR B and SEF, Campus international de Baillarguet, 34398 Montpellier Cedex 5, France |
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EcoFoG @ webmaster @ |
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489 |
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| Author |
Vincent, G.; Caron, F.; Sabatier, D.; Blanc, L. |
| Title |
LiDAR shows that higher forests have more slender trees |
Type |
Journal Article |
| Year |
2012 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois Forets Tropiques |
| Volume |
66 |
Issue |
314 |
Pages |
51-56 |
| Keywords |
Competition; Fertility; French Guiana; LiDAR; Tree allometry |
| Abstract |
High-density Airborne Laser Scanning was used to derive the Canopy Height Model (CHM) of an experimental forest site in the neotropics (Paracou, French Guiana). Individual tree heights were computed by manually segmenting tree crowns on the CHM and then extracting the local maximum canopy height. Three hundred and ninety-six (396) height estimates were matched from dominant or emergent trees with the corresponding ground records of stem diameters sampled in two plots with different mean canopy heights (28.1 m vs. 31.3 m). Tree slenderness was found to be positively and very significantly correlated with mean canopy height at the plot level. The same correlation was observed at the species population level for the three species adequately sampled. It can therefore be concluded that stratification by canopy height is to be recommended when deriving allometric relationships in order to avoid bias in Above Ground Biomass estimations. |
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CIRAD, UMR Ecofog, 97300 Kourou, France |
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0006579x (Issn) |
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Export Date: 5 June 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: IRD, UMR AMAP, 34000 Montpellier, France |
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EcoFoG @ webmaster @ |
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490 |
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Scotti, I. |
| Title |
Adaptive potential in forest tree populations: what is it, and how can we measure it? |
Type |
Journal Article |
| Year |
2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
67 |
Issue |
8 |
Pages |
801 |
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INRA, Unite Mixte Rech Ecol Forets Guyane EcoFoG, F-97387 Kourou, France, Email: ivan.scotti@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000283594400002 |
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EcoFoG @ eric.marcon @ |
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21 |
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| Author |
Bremaud, I.; Minato, K.; Langbour, P.; Thibaut, B. |
| Title |
Physico-chemical indicators of inter-specific variability in vibration damping of wood |
Type |
Journal Article |
| Year |
2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
67 |
Issue |
7 |
Pages |
707 |
| Keywords |
damping coefficient; diversity of woods; extractives; physical properties; vibrational properties |
| Abstract |
The vibration damping coefficient (tan delta) of wood is an important property for acoustical uses, including musical instruments. Current difficulties in the availability of some of the preferred species call for diversification, but this comes up against the lack of systematic damping coefficient data. Keeping in mind the possible factors affecting tans, could we predict its variations between species, by using indicators that are either easily measured and/or readily available for many species? Vibrational properties, equilibrium moisture content and colorimetric parameters were assessed on 94 wood types belonging to 76 species. Experimental results were then related to data on chemical contents and physical properties from the CIRAD database. The “standard” relationship between tan delta and specific modulus of elasticity (E'/rho) explained only half of the variations. Deviations from this trend were correlated to extractives content, yet effects were not directly quantitative. Damping deviations were also correlated to colour and moisture-related properties, especially so with fibre saturation point. By taking into account a combination of moisture-related properties, colour – or extractives content, and the “standard” relationship between tans and E'/rho, we could propose simple predictive models which explain up to 89% of observed variations in tan delta between 48 species. |
| Address |
[Bremaud, Iris] Univ Montpellier 2, Lab Mecan & Genie Civil, CNRS, F-34095 Montpellier 5, France, Email: iris_bremaud@hotmail.com |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000283532000007 |
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EcoFoG @ eric.marcon @ |
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23 |
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Coste, S.; Baraloto, C.; Leroy, C.; Marcon, E.; Renaud, A.; Richardson, A.D.; Roggy, J.C.; Schimann, H.; Uddling, J.; Herault, B. |
| Title |
Assessing foliar chlorophyll contents with the SPAD-502 chlorophyll meter: a calibration test with thirteen tree species of tropical rainforest in French Guiana |
Type |
Journal Article |
| Year |
2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
67 |
Issue |
6 |
Pages |
607 |
| Keywords |
chlorophyll estimate; model calibration; homographic functions; neotropical trees |
| Abstract |
Chlorophyll meters such as the SPAD-502 offer a simple, inexpensive and rapid method to estimate foliar chlorophyll content. However, values provided by SPAD-502 are unitless and require empirical calibrations between SPAD units and extracted chlorophyll values. Leaves of 13 tree species from the tropical rain forest in French Guiana were sampled to select the most appropriate calibration model among the often-used linear, polynomial and exponential models, in addition to a novel homographic model that has a natural asymptote. The homographic model best accurately predicted total chlorophyll content (mu g cm(-2)) from SPAD units (R-2 = 0.89). Interspecific differences in the homographic model parameters explain less than 7% of the variation in chlorophyll content in our data set. The utility of the general homographic model for a variety of research and management applications clearly outweighs the slight loss of model accuracy due to the abandon of the species' effect. |
| Address |
[Herault, Bruno] Univ Antilles Guyane, Unite Mixte Rech Ecol Forets Guyane, Kourou, France, Email: bruno.herault@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000282350300007 |
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EcoFoG @ eric.marcon @ |
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40 |
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| Author |
Jaouen, G.; Fournier, M.; Almeras, T. |
| Title |
Thigmomorphogenesis versus light in biomechanical growth strategies of saplings of two tropical rain forest tree species |
Type |
Journal Article |
| Year |
2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
67 |
Issue |
2 |
Pages |
211 |
| Keywords |
biomechanics; thigmomorphogenesis; height growth strategies; tropical rain forest; French Guiana |
| Abstract |
In the dense tropical rainforest understorey, saplings exhibit different growth strategies aiming at reaching light levels better fitting their ecology. Investing mainly in height growth, at the expense of their width, a lot are close to mechanical instability. Tachigali melinonii, a long living heliophilic tree species, is frequently observed to be extremely slender and supported by neighbours. Such observations suggest an active growth control through the perception of mechanical environment. Mechanical environment or light availability, which one is the most influent on growth and slenderness (H/D)? To test this question, we recorded growth of control and staked saplings of two species with contrasting habits and ecology: T. melinonii, and Dicorynia guianensis, along a natural light gradient. Dicorynia, the more stable, responded more clearly to the staking treatment, showing slenderness increase when light is available, whereas for Tachigali, only light availability governed growth. For Tachigali, growth allocation is mainly governed by light availability and ontogeny, whereas Dicorynia is probably similar to the average tree strategy, using the thigmomorphogenetic physiological process to control its stability. |
| Address |
[Jaouen, Gaelle; Almeras, Tancrede] Univ Antilles Guyane, INRA, CNRS,Cirad, Unite Mixte Rech Ecol Forets Guyane,AgroParisTech, Kourou 97379, French Guiana, Email: gaelle.jaouen@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000276507100012 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
61 |
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| Author |
Baraloto, C.; Marcon, E.; Morneau, F.; Pavoine, S.; Roggy, J.C. |
| Title |
Integrating functional diversity into tropical forest plantation designs to study ecosystem processes |
Type |
Journal Article |
| Year |
2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
67 |
Issue |
3 |
Pages |
303 |
| Keywords |
complementarity; ecosystem function; functional groups; leaf economics spectrum; nitrogen fixation; quadratic entropy |
| Abstract |
The elucidation of relationships between biodiversity and ecosystem processes has been limited by the definition of metrics of biodiversity and their integration into experimental design. Functional trait screening can strengthen the performance of these designs. We suggest the use of Rao's quadratic entropy to measure both functional diversity and phylogenetic diversity of species mixtures proposed for an experimental design, and demonstrate how they can provide complementary information. We also present an index assessing the statistical performance of these independent variables in different experimental designs. Measurement of independent variables as continuous vs. discrete variables reduces statistical performance, but improves the model by quantifying species differences masked by group assignments. To illustrate these advances, we present an example from a tropical forest tree community in which we screened 38 species for nine functional traits. The proposed TropiDEP design is based on the relative orthogonality of two multivariate trait axes defined using principal component analysis. We propose that independent variables describing functional diversity might be grouped to calculate independent variables describing suites of different traits with potentially different effects on particular ecosystem processes. In other systems these axes may differ from those reported here, yet the methods of analysis integrating functional and phylogenetic diversity into experimental design could be universal. |
| Address |
[Baraloto, Christopher; Roggy, Jean-Christophe] INRA, UMR Ecol Forets Guyane, Kourou, French Guiana, Email: chris.baraloto@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000276507800004 |
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no |
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EcoFoG @ eric.marcon @ |
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62 |
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Rodrigues, A.M.; Amusant, N.; Beauchene, J.; Eparvier, V.; Lemenager, N.; Baudasse, C.; Espindola, L.S.; Stien, D. |
| Title |
The termiticidal activity of Sextonia rubra (Mez) van der Werff (Lauraceae) extract and its active constituent rubrynolide |
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Journal Article |
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2011 |
Publication |
Pest Management Science |
Abbreviated Journal |
Pest Manage. Sci. |
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67 |
Issue |
11 |
Pages |
1420-1423 |
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Nasutitermes macrocephalus; Reticulitermes flavipes; Rubrynolide; Sextonia rubra extract; Wood preservation |
| Abstract |
Termites are degradation agents that inflict severe damage on wood. Some long-lasting Amazonian trees can resist these insects by producing toxic secondary metabolites. These metabolites could potentially replace synthetic termiticidal products which are becoming more restricted to use. Results: Sextonia rubra is resistant to termite-induced degradation. It has been demonstrated that this species naturally produces an ethyl-acetate-soluble termiticidal metabolite, rubrynolide, to protect its wood. Assays in the presence of tropical and invasive termites established that both rubrynolide and crude ethyl acetate extract from S. rubra wood can be used as a treatment for the protection of sensitive woods against termites. Conclusion: Rubrynolide and S. rubra extract are promising candidates for the replacement of synthetic termiticides. © 2011 Society of Chemical Industry. |
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CNRS-Institut de Chimie des Substances Naturelles, Gif-sur-Yvette, France |
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1526498x (Issn) |
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Export Date: 26 October 2011; Source: Scopus; Coden: Pmscf; doi: 10.1002/ps.2167; Language of Original Document: English; Correspondence Address: Rodrigues, A.M.; UMR Ecofog, Institut d'Enseignement Supérieur de la Guyane, BP792, 97337 Cayenne Cedex, France; email: alice.rodrigues@pop.com.br |
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EcoFoG @ webmaster @ |
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362 |
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Bordenave, B.; Lehir, F.; Lorans, M. |
| Title |
Current knowledge on threatened plant species of French Guiana |
Type |
Journal Article |
| Year |
2012 |
Publication |
Revue d'Ecologie (La Terre et la Vie) |
Abbreviated Journal |
Rev. Ecol. Terre Vie |
| Volume |
67 |
Issue |
Suppl.2 |
Pages |
29-45 |
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The elaboration of a first list of the most threatened species of the overseas territory of French Guyana was undertaken in 2009 by the Association for Botanical Conservation in French Guiana in collaboration with the National Botanical Conservatory of Brest. Carried out in synergy with the updating of the species list for Natural Areas of Ecological, Faunistic and Floritic Interests supervised by the Region Science Council for Natural Heritage, this work includes 97 vascular plants, 18 of which can be considered as threatened in the state of current knowledge, according to the IUCN criteria which are recommended by the Federation of National Botanical Conservatories. Among these 18 taxa, threatened because of their rarity and the fragility of their natural habitats, 17 are already protected by a 2001 ministry decree and one is from a new genus, Hekkingia bordenavei; nine of these appear to be of high concern for conservation: Cleistes grandifiora (Orchidaceae), Cornutia pubescens (Verbenaceae), Antirhea triflora (Rubiaceae), Himathantus drasticus (Apocynaceae), Axonopus oiapocensis (Poaceae), Psychotria granvillei (Rubiaceae), Eriocaulon guyanense (Eriocaulaceae) along with two palm species subject to National Action Plans for their conservation since 2009, Astrocaryum minus and Bactris nancibaensis. This study also contributes to the on-going “regional Red List” of the French Guiana flora. |
| Address |
Étudiant en Master 2, Écologie des Forêts Tropicales, Université de Kourou, 1 rue de l'Université, 97310 Kourou, Guyane Française, France |
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02497395 (Issn) |
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Export Date: 13 April 2012; Source: Scopus; Coden: Retve; Language of Original Document: French; Correspondence Address: Bordenave, B.; BGB Consultance, Botanique Tropicale, 9 route des grandes roches, 29910 Trégunc, France; email: bruno.bordenave@wanadoo.fr |
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EcoFoG @ webmaster @ |
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390 |
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Brémaud, I.; Ruelle, J.; Thibaut, A.; Thibaut, B. |
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Changes in viscoelastic vibrational properties between compression and normal wood: Roles of microfibril angle and of lignin |
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Journal Article |
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2013 |
Publication |
Holzforschung |
Abbreviated Journal |
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67 |
Issue |
1 |
Pages |
75-85 |
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Compression wood (CW); Damping coefficient; Ft-Ir; Internal friction; Lignin; Microfibril angle (MFA); Picea abies; Pinus pinaster; Pinus sylvestris; Specific dynamic modulus of elasticity; Viscoelastic vibrational properties |
| Abstract |
This study aims at better understanding the respective influences of specific gravity (γ ), microfibril angle (MFA), and cell wall matrix polymers on viscoelastic vibrational properties of wood in the axial direction. The wide variations of properties between normal wood (NW) and compression wood (CW) are in focus. Three young bent trees (Picea abies, Pinus sylvestris and Pinus pinaster ), which recovered verticality, were sampled. Several observed differences between NW and CW were highly significant in terms of anatomical, physical (γ, shrinkage, CIE Lab colorimetry), mechanical (compressive strength), and vibrational properties. The specific dynamic modulus of elasticity (E′/γ) decreases with increasing MFA, and Young's modulus (E′) can be satisfactorily explained by γ and MFA. Apparently, the type of the cell wall polymer matrix is not influential in this regard. The damping coefficient (tan δ) does not depend solely on the MFA of NW and CW. The tanδ-E′/γ relationship evidences that, at equivalent E′/γ, the tan δ of CW is approximately 34% lower than that of NW. This observation is ascribed to the more condensed nature of CW lignins, and this is discussed in the context of previous findings in other hygrothermal and time/frequency domains. It is proposed that the lignin structure and the amount and type of extractives, which are both different in various species, are partly responsible for taxonomy-related damping characteristics. Copyright © by Walter de Gruyter • Berlin • Boston. |
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Wood Laboratory, Empa-Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland |
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Export Date: 25 February 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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471 |
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