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Mathieu, A.; Letort, V.; Cournède, P.H.; Zhang, B.G.; Heuret, P.; De Reffye, P. |
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Oscillations in functional structural plant growth models |
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2012 |
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Mathematical Modelling of Natural Phenomena |
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7 |
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6 |
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47-66 |
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Cecropia trees; Cucumber plant; Dynamic system of plant growth; Functional-structural plant models; GreenLab |
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The dynamic model of plant growth GreenLab describes plant architecture and functional growth at the level of individual organs. Structural development is controlled by formal grammars and empirical equations compute the amount of biomass produced by the plant, and its partitioning among the growing organs, such as leaves, stems and fruits. The number of organs initiated at each time step depends on the trophic state of the plant, which is evaluated by the ratio of biomass available in plant to the demand of all the organs. The control of the plant organogenesis by this variable induces oscillations in the simulated plant behaviour. The mathematical framework of the GreenLab model allows to compute the conditions for the generation of oscillations and the value of the period according to the set of parameters. Two case-studies are presented, corresponding to emergence of oscillations associated to fructification and branching. Similar alternating patterns are commonly reported by botanists. In this article, two examples were selected: alternate patterns of fruits in cucumber plants and alternate appearances of branches in Cecropia trees. The model was calibrated from experimental data collected on these plants. It shows that a simple feedback hypothesis of trophic control on plant structure allows the emergence of cyclic patterns corresponding to the observed ones. © EDP Sciences, 2012. |
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CIRAD, UMR AMAP, Montpellier, France |
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Export Date: 27 December 2012; Source: Scopus |
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EcoFoG @ webmaster @ |
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452 |
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Fanin, N.; Barantal, S.; Fromin, N.; Schimann, H.; Schevin, P.; Hattenschwiler, S. |
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Distinct Microbial Limitations in Litter and Underlying Soil Revealed by Carbon and Nutrient Fertilization in a Tropical Rainforest |
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2012 |
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PLoS ONE |
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7 |
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12 |
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e49990 |
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Human-caused alterations of the carbon and nutrient cycles are expected to impact tropical ecosystems in the near future. Here we evaluated how a combined change in carbon (C), nitrogen (N) and phosphorus (P) availability affects soil and litter microbial respiration and litter decomposition in an undisturbed Amazonian rainforest in French Guiana. In a fully factorial C (as cellulose), N (as urea), and P (as phosphate) fertilization experiment we analyzed a total of 540 litterbag-soil pairs after a 158-day exposure in the field. Rates of substrate-induced respiration (SIR) measured in litter and litter mass loss were similarly affected by fertilization showing the strongest stimulation when N and P were added simultaneously. The stimulating NP effect on litter SIR increased considerably with increasing initial dissolved organic carbon (DOC) concentrations in litter, suggesting that the combined availability of N, P, and a labile C source has a particularly strong effect on microbial activity. Cellulose fertilization, however, did not further stimulate the NP effect. In contrast to litter SIR and litter mass loss, soil SIR was reduced with N fertilization and showed only a positive effect in response to P fertilization that was further enhanced with additional C fertilization. Our data suggest that increased nutrient enrichment in the studied Amazonian rainforest can considerably change microbial activity and litter decomposition, and that these effects differ between the litter layer and the underlying soil. Any resulting change in relative C and nutrient fluxes between the litter layer and the soil can have important consequences for biogeochemical cycles in tropical forest ecosystems. © 2012 Fanin et al. |
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UMR Ecologie des Forêts de Guyane (EcoFoG), Campus Agronomique, Kourou, French Guiana |
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Export Date: 3 January 2013; Source: Scopus; Art. No.: e49990 |
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EcoFoG @ webmaster @ |
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454 |
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Barabe, D.; Cuerrier, A.; Quilichini, A. |
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Botanical gardens: Between science and commercialization |
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2012 |
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Natures Sciences Societes |
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20 |
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3 |
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334-342 |
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Les jardins botaniques: Entre science et commercialisation. |
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Enseignante-chercheure en Écologie, CNRS, UMR8172 Icologie des Dorêts de Guyane, 97387 Kourou, France |
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Export Date: 3 January 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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455 |
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Dejean, A.; Carpenter, J.M.; Corbara, B.; Wright, P.; Roux, O.; LaPierre, L.M. |
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The hunter becomes the hunted: When cleptobiotic insects are captured by their target ants |
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2012 |
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Naturwissenschaften |
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99 |
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4 |
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265-273 |
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Ant predation; Cleptobiosis; Flies and Reduviidae; Myrmecophyte; Social wasps; Stingless bees |
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Here we show that trying to rob prey (cleptobiosis) from a highly specialized predatory ant species is risky. To capture prey, Allomerus decemarticulatus workers build gallery-shaped traps on the stems of their associated myrmecophyte, Hirtella physophora. We wondered whether the frequent presence of immobilized prey on the trap attracted flying cleptoparasites. Nine social wasp species nest in the H. physophora foliage; of the six species studied, only Angiopolybia pallens rob prey from Allomerus colonies. For those H. physophora not sheltering wasps, we noted cleptobiosis by stingless bees (Trigona), social wasps (A. pallens and five Agelaia species), assassin bugs (Reduviidae), and flies. A relationship between the size of the robbers and their rate of capture by ambushing Allomerus workers was established for social wasps; small wasps were easily captured, while the largest never were. Reduviids, which are slow to extract their rostrum from prey, were always captured, while Trigona and flies often escaped. The balance sheet for the ants was positive vis-à-vis the reduviids and four out of the six social wasp species. For the latter, wasps began by cutting up parts of the prey's abdomen and were captured (or abandoned the prey) before the entire abdomen was retrieved so that the total weight of the captured wasps exceeded that of the prey abdomens. For A. pallens, we show that the number of individuals captured during attempts at cleptobiosis increases with the size of the Allomerus' prey. © Springer-Verlag 2012. |
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Department of Biology, Lower Columbia College, 1600 Maple St., Longview, WA 98632, United States |
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Cited By (since 1996): 1; Export Date: 16 January 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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458 |
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Lamarre, G.P.A.; Baraloto, C.; Fortunel, C.; Dávila, N.; Mesones, I.; Rios, J.G.; Ríos, M.; Valderrama, E.; Pilco, M.V.; Fine, P.V.A. |
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Title |
Herbivory, growth rates, and habitat specialization in tropical tree lineages: implications for Amazonian beta-diversity |
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Journal Article |
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2012 |
Publication |
Ecology |
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Ecology |
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93 |
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sp8 |
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S195-S210 |
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Ecological Society of America |
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0012-9658 |
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doi: 10.1890/11-0397.1 |
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EcoFoG @ webmaster @ |
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459 |
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Barabe, D.; Lacroix, C.; Gibernau, M. |
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Developmental floral morphology of Syngonium in the context of the tribe Caladieae (Araceae) |
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Journal Article |
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2012 |
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Willdenowia – Annals of the Botanic Garden and Botanical Museum Berlin-Dahlem |
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42 |
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2 |
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297-305 |
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Aroids; Inflorescence; Phylogeny; Oxalate Crystals; Flower |
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The floral development of Syngonium angustatum is analysed in the context of a recently published molecular phylogeny of the Araceae. The initiation of discoid floral primordia occurs acropetally on the surface of the inflorescence. Female flowers, atypical bisexual flowers, sterile male flowers and male flowers are inserted on the same phyllotactic spirals on the spadix. Stamen primordia are initiated simultaneously on the periphery of more or less circular floral primordia. There are four stamens per flower (rarely three). In a synandrium, the fusion of stamens occurs very early during their developmental cycle. In some flowers one or two stamens remain free. The staminodes are also initiated on the periphery of the discoid floral primordium and their number varies from four to six. The growth of the fused staminodes will eventually form a longitudinal cavity in the centre of the mature synandrode. On the synandrodes located near the female zone, one or two staminodes remain free during development. No atypical bisexual flowers were observed on the inflorescence of Syngonium. The presence of a few calcium oxalate crystals was observed on the surface of all types of flowers. All the atypical flowers located at the base of the sterile zone corresponded to sterile male flowers and resulted from a more or less random disorganisation of the typical structure of a synandrode. In the Aroideae, free stamens or staminodes represent a plesiomorphic condition. The association of synandria and synandrodes is present in all early diverging genera of the tribe Caladieae and could represent the ancestral state. It is not clear if free stamens have evolved once or twice in the tribe Caladieae, both scenarios are possible. |
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EcoFoG @ webmaster @ |
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460 |
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Tritsch, I.; Gond, V.; Oszwald, J.; Davy, D.; Grenand, P. |
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Territorial dynamics in the wayãpi and teko amerindian communities of the middle oyapock, camopi, French Guiana |
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Journal Article |
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2012 |
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Bois et Forets des Tropiques |
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Bois Forets Tropiques |
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66 |
Issue |
311 |
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49-61 |
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Amerindian populations; French Guiana; Protected area; Slash-and-burn cultivation; System of natural resource use; Territorial management |
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Amerindian populations have been experiencing major socio-economic changes for several decades, in a context of rapid demographic growth. This article addresses the ways in which the Amerindian populations of French Guiana have adapted their land use and natural resource management systems to cope with the pressures exerted on their lands and lifestyles. The aim was to investigate the resilience of their systems for land and natural resource use. The concentration of Amerindian habitats around the town of Camopi, which is linked to the availability of health and school infrastructure and to efforts to promote a sedentary lifestyle, is a factor of increasing natural resource scarcity and social alienation. The system is adapting by fragmenting the Amerindian habitat into peripheral villages and extending farmlands along rivers to access to more space. These villages replicate patterns of spatial organisation that are similar to those found in traditional Wayãpi and Teko villages, except that habitation is sedentary, as families hope to have their villages equipped with at lEast drinking water and electrification. Habitat fragmentation is spatially limited by the time taken for daily journeys to school, and therefore by school bus services (dugout), which means that land use is effectively conditioned by services and infrasrtucture. Other living quarters are maintained at a distance from the village, so that the habitat is bi-local: families have a main home where services and infrastructure are available, and a secondary itinerant home further away, which is chosen according to the quality of farmland, the hunting yield of hunting resources, the history of the location and family networks. These distant homes are kept up by spending income from social assistance on transport. It's thus shown that these Amerindian systems for land and natural resource uses are highly adaptable, in that their sustainability is guaranteed by the reconstruction of a circular pattern of mobility in accordance with the intensity of resource use. |
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Ird Observatoire Hommes-Milieux Oyapock, Cnrs Guyane, 2, avenue Gustave Charlery, 97300 Cayenne, France |
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0006579x (Issn) |
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Export Date: 17 April 2013; Source: Scopus; Language of Original Document: French; Correspondence Address: Tritsch, I.; Université des Antilles et de la Guyane/Cirad, Umr Écologie des forêts de Guyane, Campus agronomique de Kourou, 97310 Kourou, France |
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EcoFoG @ webmaster @ |
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482 |
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Sist, P.; Blanc, L.; Mazzei, L.; Baraloto, C.; Aussenac, R. |
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Current knowledge on overall post-logging biomass dynamics in Northern Amazonian forests |
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Journal Article |
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2012 |
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Bois et Forets des Tropiques |
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Bois Forets Tropiques |
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66 |
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314 |
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41-49 |
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Above ground-biomass; Amazonian rainforests; Logging impact; Silviculture |
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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. |
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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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Vincent, G.; Caron, F.; Sabatier, D.; Blanc, L. |
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LiDAR shows that higher forests have more slender trees |
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Journal Article |
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2012 |
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Bois et Forets des Tropiques |
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Bois Forets Tropiques |
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66 |
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314 |
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51-56 |
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Competition; Fertility; French Guiana; LiDAR; Tree allometry |
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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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Hmimina, G.; Dufrêne, E.; Pontailler, J.-Y.; Delpierre, N.; Aubinet, M.; Caquet, B.; de Grandcourt, A.; Burban, B.; Flechard, C.; Granier, A.; Gross, P.; Heinesch, B.; Longdoz, B.; Moureaux, C.; Ourcival, J.-M.; Rambal, S.; Saint André, L.; Soudani, K. |
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Evaluation of the potential of MODIS satellite data to predict vegetation phenology in different biomes: An investigation using ground-based NDVI measurements |
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2013 |
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Remote Sensing of Environment |
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132 |
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145-158 |
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Crops; Deciduous forests; Evergreen forests; Ground-based NDVI; Modis; Phenology |
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Vegetation phenology is the study of the timing of seasonal events that are considered to be the result of adaptive responses to climate variations on short and long time scales. In the field of remote sensing of vegetation phenology, phenological metrics are derived from time series of optical data. For that purpose, considerable effort has been specifically focused on developing noise reduction and cloud-contaminated data removal techniques to improve the quality of remotely-sensed time series. Comparative studies between time series composed of satellite data acquired under clear and cloudy conditions and from radiometric data obtained with high accuracy from ground-based measurements constitute a direct and effective way to assess the operational use and limitations of remote sensing for predicting the main plant phenological events. In the present paper, we sought to explicitly evaluate the potential use of MODerate resolution Imaging Spectroradiometer (MODIS) remote sensing data for monitoring the seasonal dynamics of different types of vegetation cover that are representative of the major terrestrial biomes, including temperate deciduous forests, evergreen forests, African savannah, and crops. After cloud screening and filtering, we compared the temporal patterns and phenological metrics derived from in situ NDVI time series and from MODIS daily and 16-composite products. We also evaluated the effects of residual noise and the influence of data gaps in MODIS NDVI time series on the identification of the most relevant metrics for vegetation phenology monitoring. The results show that the inflexion points of a model fitted to a MODIS NDVI time series allow accurate estimates of the onset of greenness in the spring and the onset of yellowing in the autumn in deciduous forests (RMSE ≤ one week). Phenological metrics identical to those provided with the MODIS Global Vegetation Phenology product (MDC12Q2) are less robust to data gaps, and they can be subject to large biases of approximately two weeks or more during the autumn phenological transitions. In the evergreen forests, in situ NDVI time series describe the phenology with high fidelity despite small temporal changes in the canopy foliage. However, MODIS is unable to provide consistent phenological patterns. In crops and savannah, MODIS NDVI time series reproduce the general temporal patterns of phenology, but significant discrepancies appear between MODIS and ground-based NDVI time series during very localized periods of time depending on the weather conditions and spatial heterogeneity within the MODIS pixel. In the rainforest, the temporal pattern exhibited by a MODIS 16-day composite NDVI time series is more likely due to a pattern of noise in the NDVI data structure according to both rainy and dry seasons rather than to phenological changes. More investigations are needed, but in all cases, this result leads us to conclude that MODIS time series in tropical rainforests should be interpreted with great caution. © 2013 Elsevier Inc. |
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INRA, Unité Biogéochimie des Ecosystèmes Forestiers, Champenoux, France |
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Export Date: 21 February 2013; Source: Scopus |
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no |
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EcoFoG @ webmaster @ |
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467 |
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| Permanent link to this record |
