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Roy, M.; Vasco-Palacios, A.; Geml, J.; Buyck, B.; Delgat, L.; Giachini, A.; Grebenc, T.; Harrower, E.; Kuhar, F.; Magnago, A.; Rinaldi, A.C.; Schimann, H.; Selosse, M.-A.; Sulzbacher, M.A.; Wartchow, F.; Neves, M.-A. |
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The (re)discovery of ectomycorrhizal symbioses in Neotropical ecosystems sketched in Florianópolis |
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Journal Article |
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2017 |
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New Phytologist |
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New Phytologist |
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214 |
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3 |
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920-923 |
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barcoding; biodiversity; ectomycorrhizal fungi; ectomycorrhizal roots; ectomycorrhizal symbioses; fruitbodies; Neotropical ecosystems |
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Departamento de Sistemática e Ecologia/CCEN, Laboratório de Morfo-Taxonomia Fúngica, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil |
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Cited By :1; Export Date: 23 April 2017 |
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EcoFoG @ webmaster @ |
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749 |
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Lehnebach, R.; Doumerc, L.; Clair, B.; Alméras, T. |
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Title |
Mechanical stress in the inner bark of 15 tropical tree species and the relationship with anatomical structure |
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Journal Article |
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2020 |
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Botany |
Abbreviated Journal |
Bot. |
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98 |
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1 |
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1-8 |
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Bark anatomical structure; Mechanical stress; Sclereids; Secondary phloem; Tree biomechanics; Tropical species |
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Recent studies have shown that the inner bark is implicated in the postural control of inclined tree stems through the interaction between wood radial growth and tangential expansion of a trellis fiber network in bark. Assessing the taxonomic extent of this mechanism requires a screening of the diversity in bark anatomy and mechanical stress. The mechanical state of bark was measured in 15 tropical tree species from various botanical families on vertical mature trees, and related to the anatomical structure of the bark. Significant tensile or compressive longitudinal stresses were observed in the stems of most species. Tensile longitudinal stress was observed in various botanical families and was always associated with fibers arranged in a trellis-like structure and strong dilatation of rays. The highest tensile stress was recorded in species with gelatinous fibers forming a treillis. Compressive stress was typically associated with a large amount of sclereids in the bark, supporting the differentiation of sclereids as a potential origin of the generation of longitudinal compressive stresses in bark. In species exhibiting both a fibrous trellis structure and a significant amount of sclereids, the sign of longitudinal stress may depend on the balance between these two mechanisms. |
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Faculty of Bioscience Engineering, Laboratory of Wood Technology, Woodlab, Coupure Links 653, Gent, B-9000, Belgium |
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Canadian Science Publishing |
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19162804 (Issn) |
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Cited By :1; Export Date: 20 January 2020; Correspondence Address: Lehnebach, R.; Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier, CNRS, 860 rue de St. Priest, France; email: lehnebach.romain@hotmail.fr |
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EcoFoG @ webmaster @ |
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913 |
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Paine, C.E.T.; Stahl, C.; Courtois, E.A.; Patino, S.; Sarmiento, C.; Baraloto, C. |
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Functional explanations for variation in bark thickness in tropical rain forest trees |
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Journal Article |
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2010 |
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Functional Ecology |
Abbreviated Journal |
Funct. Ecol. |
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24 |
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6 |
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1202-1210 |
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bark thickness; fire ecology; flexural rigidity; herbivore defence; periderm; rhytidome; trunk respiration |
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P>1. The complex structure of tree bark reflects its many functions, which include structural support as well as defence against fire, pests and pathogens. Thick bark, however, might limit respiration by the living tissues of the trunk. Nevertheless, little research has addressed community-level variation in bark thickness, and to the best of our knowledge, no one has tested multiple hypotheses to explain variation in bark thickness. 2. We conducted an extensive survey of bark thickness within and among species of trees in the tropical rain forests of French Guiana. Trunk bark thickness increased by 1 center dot 2 mm per 10 cm increase in stem diameter, and varied widely at all taxonomic levels. Mean trunk bark thickness was 4 center dot 5 mm (range: 0 center dot 5-29 mm), which was less that found in two Amazonian rain forests in previous studies. This survey of bark thickness should be of use for forest management since tree survival through fire is strongly predicted by bark thickness. 3. We combined the survey data with multiple datasets to test several functional hypotheses proposed to explain variation in bark thickness. We found bark to provide an average of 10% of the flexural rigidity of tree stems, which was substantially less than that found in the only other study of bark stiffness. Bark thickness was uncorrelated with species' association with fire-prone habitats, suggesting that the influence of fire on bark thickness does not extend into moist Forests. There was also little evidence that bark thickness is affected by its function as a defence against herbivory. Nor was there evidence that thick bark limits trunk respiration. 4. A re-analysis of previously collected anatomical data indicated that variation in rhytidome (non-conducting outer bark) thickness explains much of the variation in overall bark thickness. As rhytidome is primarily involved in protecting the living tissues of the trunk, we suggest that bark thickness is driven mostly by its defensive function. 5. Functional explanations for the variation in bark thickness were not clear-cut. Nevertheless, this study provides a foundation for further investigation of the functional bases of bark in tropical trees. |
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[Paine, Charles Eliot Timothy] ENGREF, UMR Ecol Forets Guyane, F-97387 Kourou, France, Email: timothy.paine@ieu.uzh.ch |
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WILEY-BLACKWELL PUBLISHING, INC |
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0269-8463 |
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ISI:000284589400005 |
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EcoFoG @ eric.marcon @ |
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15 |
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Ghislain, B.; Alméras, T.; Prunier, J.; Clair, B. |
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Contributions of bark and tension wood and role of the G-layer lignification in the gravitropic movements of 21 tropical tree species |
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Journal Article |
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2019 |
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Annals of Forest Science |
Abbreviated Journal |
Ann. Forest Sci. |
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76 |
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4 |
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107 |
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Bark; Biomechanics; G-layer; Lignification; Tension wood; Tropical rainforest; Magnoliophyta |
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Key message: Gravitropic movements in angiosperm woody stems are achieved through the action of bark and/or wood motor, depending on the bark and wood fibre anatomy (with trellis structure or not; with G-layers or not). Bark motor is as efficient as wood motor to recover from tilting in young trees of 21 tropical species. Context: Angiosperm trees produce tension wood to control their orientation through changes in stem curvature. Tension wood is classified into 3 anatomical groups: with unlignified G-layer, with lignified G-layer and without G-layer. Aims: This study aimed at assessing whether this anatomical diversity reflects a diversity in efficiency of gravitropic movement. Methods: The study was conducted on tropical seedling from the three anatomical groups. Seedlings were staked and grown tilted. At the end of the experiment, changes in curvature when releasing the stem from the stake and when removing bark were measured. Three parameters were computed to compare the global efficiency of gravitropism (stem gravitropic efficiency) and the specific efficiency of motor mechanism based on wood (maturation strain of tension wood) and bark (standardized debarking curvature). Results: The maturation strain of tension wood was similar between species with unlignified and lignified G-layer. Species without G-layer exhibited low maturation strain and large debarking curvature, showing they rely on bark for gravitropism. Bark and wood achieved similar motor efficiency. Conclusion: Lignin does not affect the generation of tensile stress in the G-layer. Bark can be as efficient as wood as a motor of gravitropic movements. © 2019, The Author(s). |
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Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier, CNRS, Montpellier, 34095, France |
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Springer |
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12864560 (Issn) |
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EcoFoG @ webmaster @ |
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900 |
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Stahl, C.; Burban, B.; Bompy, F.; Jolin, Z.B.; Sermage, J.; Bonal, D. |
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Seasonal variation in atmospheric relative humidity contributes to explaining seasonal variation in trunk circumference of tropical rain-forest trees in French Guiana |
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Journal Article |
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2010 |
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Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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26 |
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393-405 |
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bark; drought; secondary growth; seasonality; tropical rain forest; water |
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Large seasonal variation in the rate of change in girth of tropical rain-forest tree species has been described, but its origin is still under debate. We tested whether this variation might be related to variation in atmospheric relative humidity through its influence on bark water content and thickness. Variation in trunk circumference of 182 adult trees was measured about twice a month in an undisturbed tropical rain forest over 18 mo using dendrometers. Furthermore, a laboratory experiment was conducted to test the direct influence of relative air humidity on bark water content and thickness. in the field, most trees displayed highly positive rates of change in girth at the onset of the wet season, while a quarter of the trees displayed negative changes during long dry seasons, whatever their total annual growth. This variation was correlated with environmental conditions, particularly with atmospheric relative humidity. Trees with high bark water content and thickness displayed a stronger decrease in girth during the dry season. in the chamber experiment, desiccation induced a decrease in the diameter of the trunk sections in tandem with a decrease in bark water content. As a result, seasonal variation in the rate of change in girth of tropical rain-forest trees reflects variation in trunk biophysical properties, through the influence of relative humidity on bark properties. but not directly variation in secondary growth. |
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[Stahl, Clement; Burban, Benoit; Bompy, Felix; Jolin, Zachari B.; Sermage, Juliette; Bonal, Damien] INRA, UMR Ecol Forets Guyane 745, Kourou 97387, French Guiana, Email: bonal@nancy.inra.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000279100600005 |
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EcoFoG @ eric.marcon @ |
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57 |
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Clair, B.; Ghislain, B.; Prunier, J.; Lehnebach, R.; Beauchene, J.; Alméras, T. |
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Mechanical contribution of secondary phloem to postural control in trees: the bark side of the force |
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Journal Article |
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Year |
2019 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol |
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221 |
Issue |
1 |
Pages |
209-217 |
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Keywords |
bark; Malvaceae; maturation stress; secondary phloem; tree biomechanics |
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Summary To grow straight, plants need a motor system that controls posture by generating forces to offset gravity. This motor function in trees was long thought to be only controlled by internal forces induced in wood. Here we provide evidence that bark is involved in the generation of mechanical stresses in several tree species. Saplings of nine tropical species were grown tilted and staked in a shadehouse and the change in curvature of the stem was measured after releasing from the pole and after removing the bark. This first experiment evidenced the contribution of bark in the up-righting movement of tree stems. Combined mechanical measurements of released strains on adult trees and microstructural observations in both transverse and longitudinal/tangential plane enabled us to identify the mechanism responsible for the development of asymmetric mechanical stress in the bark of stems of these species. This mechanism does not result from cell wall maturation like in wood, or from the direct action of turgor pressure like in unlignified organs, but is the consequence of the interaction between wood radial pressure and a smartly organized trellis structure in the inner bark. |
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John Wiley & Sons, Ltd (10.1111) |
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0028-646x |
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doi: 10.1111/nph.15375 |
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EcoFoG @ webmaster @ |
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853 |
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Ferry, B.; Bontemps, J.-D.; Blanc, L.; Baraloto, C. |
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Is climate a stronger driver of tree growth than disturbance? A comment on Toledo et al. (2011) |
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Journal Article |
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Year |
2012 |
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Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
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100 |
Issue |
5 |
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1065-1068 |
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Basal area change; Bolivia; Climate; Disturbance; Logging; Plant-climate interactions; Tree growth; Tropical forest |
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1.A recent article published by Toledo (2011b) investigates the effects of spatial variations in climate and soil, and of logging disturbance, on tree and forest growth in Bolivia. It concludes that climate is the strongest driver of tree and forest growth and that climate change may therefore have large consequences for forest productivity and carbon sequestration. However, serious methodological and conceptual discrepancies have been found that challenge these conclusions. 2.Because of an errant coding of 'time after logging' in the regression analysis, and because floristic changes induced by logging could not be incorporated into the analysis, the effect of logging on the average diameter growth is likely to have been strongly underestimated. 3.Basal area growth was improperly calculated as basal area change, and it displayed surprisingly high values, even among unlogged plots. We hypothesize that either these plots may be actually located in secondary forests recovering from past logging, or measurement biases may have hampered the data set. 4.Regardless of climate-growth relationships established across these plots, any inference concerning the potential effects of climate change on forest growth would require a specific quantitative assessment. 5.Synthesis. It is critical to re-assess the relative weight of climate and logging disturbance as driving factors of tree and forest growth, and to find an explanation for the very high basal area increment reported among the unlogged plots. We provide specific recommendations for further analyses of this and similar data sets. © 2012 British Ecological Society. |
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INRA, UMR Ecologie des Forêts de Guyane, 97379 Kourou, French Guiana |
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00220477 (Issn) |
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Cited By (since 1996): 1; Export Date: 4 September 2012; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2011.01895.x; Language of Original Document: English; Correspondence Address: Ferry, B.; AgroParisTech, ENGREF-Nancy, UMR 1092, F-54000 Nancy, France; email: bruno.ferry@engref.agroparistech.fr |
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EcoFoG @ webmaster @ |
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426 |
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Gourlet-Fleury, S.; Rossi, V.; Rejou-Mechain, M.; Freycon, V.; Fayolle, A.; Saint-André, L.; Cornu, G.; Gérard, J.; Sarrailh, J.-M.; Flores, O.; Baya, F.; Billand, A.; Fauvet, N.; Gally, M.; Henry, M.; Hubert, D.; Pasquier, A.; Picard, N. |
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Title |
Environmental filtering of dense-wooded species controls above-ground biomass stored in African moist forests |
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Journal Article |
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Year |
2011 |
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Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
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99 |
Issue |
4 |
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981-990 |
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Basal area; Central African Republic; Determinants of plant community diversity and structure; Life-history strategy; Soil fertility; Species sorting; Vital rates; Water reserve; Wood density; aboveground biomass; basal area; climate change; data set; database; diameter; forest ecosystem; forest inventory; life history trait; nutrient availability; physical property; plant community; resource availability; soil fertility; soil nutrient; soil texture; soil type; stem; tropical forest; wood; Central African Republic |
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1.Regional above-ground biomass estimates for tropical moist forests remain highly inaccurate mostly because they are based on extrapolations from a few plots scattered across a limited range of soils and other environmental conditions. When such conditions impact biomass, the estimation is biased. The effect of soil types on biomass has especially yielded controversial results. 2.We investigated the relationship between above-ground biomass and soil type in undisturbed moist forests in the Central African Republic. We tested the effects of soil texture, as a surrogate for soil resources availability and physical constraints (soil depth and hydromorphy) on biomass. Forest inventory data were collected for trees ≥20cm stem diameter in 2754 0.5ha plots scattered over 4888km2. The plots contained 224 taxons, of which 209 were identified to species. Soil types were characterized from a 1:1000000 scale soil map. Species-specific values for wood density were extracted from the CIRAD's data base of wood technological properties. 3.We found that basal area and biomass differ in their responses to soil type, ranging from 17.8m2ha-1 (217.5tha-1) to 22.3m2ha-1 (273.3tha-1). While shallow and hydromorphic soils support forests with both low stem basal area and low biomass, forests on deep resource-poor soils are typically low in basal area but as high in biomass as forests on deep resource-rich soils. We demonstrated that the environmental filtering of slow growing dense-wooded species on resource-poor soils compensates for the low basal area, and we discuss whether this filtering effect is due to low fertility or to low water reserve. 4.Synthesis. We showed that soil physical conditions constrained the amount of biomass stored in tropical moist forests. Contrary to previous reports, our results suggest that biomass is similar on resource-poor and resource-rich soils. This finding highlights both the importance of taking into account soil characteristics and species wood density when trying to predict regional patterns of biomass. Our findings have implications for the evaluation of biomass stocks in tropical forests, in the context of the international negotiations on climate change. © 2011 The Authors. Journal of Ecology © 2011 British Ecological Society. |
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CIRAD, BP 4035, Libreville, Gabon |
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00220477 (Issn) |
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Cited By (since 1996): 1; Export Date: 23 October 2011; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2011.01829.x; Language of Original Document: English; Correspondence Address: Gourlet-Fleury, S.; Cirad, UR BandSEF, Biens et Services des Ecosystèmes Forestiers tropicaux, Campus International de Baillarguet, TA C-105/D, F-34398, Montpellier, France; email: sylvie.gourlet-fleury@cirad.fr |
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EcoFoG @ webmaster @ |
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361 |
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Vincent, G.; Sabatier, D.; Blanc, L.; Chave, J.; Weissenbacher, E.; Pélissier, R.; Fonty, E.; Molino, J.-F.; Couteron, P. |
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Title |
Accuracy of small footprint airborne LiDAR in its predictions of tropical moist forest stand structure |
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Journal Article |
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Year |
2012 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
Remote Sens. Environ. |
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125 |
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23-33 |
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Keywords |
Basal area; Lidar; Tropical moist forest |
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We predict stand basal area (BA) from small footprint LiDAR data in 129 one-ha tropical forest plots across four sites in French Guiana and encompassing a great diversity of forest structures resulting from natural (soil and geological substrate) and anthropogenic effects (unlogged and logged forests). We use predictors extracted from the Canopy Height Model to compare models of varying complexity: single or multiple regressions and nested models that predict BA by independent estimates of stem density and quadratic mean diameter. Direct multiple regression was the most accurate, giving a 9.6% Root Mean Squared Error of Prediction (RMSEP). The magnitude of the various errors introduced during the data collection stage is evaluated and their contribution to MSEP is analyzed. It was found that these errors accounted for less than 10% of model MSEP, suggesting that there is considerable scope for model improvement. Although site-specific models showed lower MSEP than global models, stratification by site may not be the optimal solution. The key to future improvement would appear to lie in a stratification that captures variations in relations between LiDAR and forest structure. © 2012 Elsevier Inc. |
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ONF, Direction régionale de la Guyane, Cayenne, 97300 France |
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00344257 (Issn) |
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Export Date: 9 August 2012; Source: Scopus; Article in Press; Coden: Rseea; doi: 10.1016/j.rse.2012.06.019; Language of Original Document: English; Correspondence Address: Vincent, G.; IRD AMAP CIRAD, TA A-51/PS2, 34398 Montpellier cedex 5, Franceemail: gregoire.vincent@ird.fr |
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EcoFoG @ webmaster @ |
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418 |
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Dezecache, C.; Salles, J.-M.; Herault, B. |
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Title |
Questioning emissions-based approaches for the definition of REDD+ deforestation baselines in high forest cover/low deforestation countries |
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Journal Article |
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Year |
2018 |
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Carbon Balance Manage. |
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13 |
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21 |
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Keywords |
Baseline; Deforestation; Guiana Shield; HFLD countries; Redd+; Reference level; Spatial modelling |
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Abstract |
Background: REDD+ is being questioned by the particular status of High Forest/Low Deforestation countries. Indeed, the formulation of reference levels is made difficult by the confrontation of low historical deforestation records with the forest transition theory on the one hand. On the other hand, those countries might formulate incredibly high deforestation scenarios to ensure large payments even in case of inaction. Results: Using a wide range of scenarios within the Guiana Shield, from methods involving basic assumptions made from past deforestation, to explicit modelling of deforestation using relevant socio-economic variables at the regional scale, we show that the most common methodologies predict huge increases in deforestation, unlikely to happen given the existing socio-economic situation. More importantly, it is unlikely that funds provided under most of these scenarios could compensate for the total cost of avoided deforestation in the region, including social and economic costs. Conclusion: This study suggests that a useful and efficient international mechanism should really focus on removing the underlying political and socio-economic forces of deforestation rather than on hypothetical result-based payments estimated from very questionable reference levels. |
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BioMed Central Ltd. |
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ISSN |
17500680 (Issn) |
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EcoFoG @ webmaster @ |
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837 |
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