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dc.contributor.authorRibeiro, Gabriel Henrique Pires de Mello-
dc.contributor.authorChambers, Jeffrey Quintin-
dc.contributor.authorJ, Peterson, Chris-
dc.contributor.authorTrumbore, Susan Elizabeth-
dc.contributor.authorMarra, Daniel Magnabosco-
dc.contributor.authorWirth, Christian B.-
dc.contributor.authorB, Cannon, Jeffery-
dc.contributor.authorNegrón-Juárez, Robinson I.-
dc.contributor.authorLima, Adriano José Nogueira-
dc.contributor.authorPaula, E. V.C.M. de-
dc.contributor.authorSantos, Joaquim dos-
dc.contributor.authorHiguchi, Niro-
dc.date.accessioned2020-06-15T21:40:11Z-
dc.date.available2020-06-15T21:40:11Z-
dc.date.issued2016-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/17230-
dc.description.abstractHigh descending winds generated by convective storms are a frequent and a major source of tree mortality disturbance events in the Amazon, affecting forest structure and diversity across a variety of scales, and more frequently observed in western and central portions of the basin. Soil texture in the Central Amazon also varies significantly with elevation along a topographic gradient, with decreasing clay content on plateaus, slopes and valleys respectively. In this study we investigated the critical turning moments (Mcrit - rotational force at the moment of tree failure, an indicator of tree stability or wind resistance) of 60 trees, ranging from 19.0 to 41.1 cm in diameter at breast height (DBH) and located in different topographic positions, and for different species, using a cable-winch load-cell system. Our approach used torque as a measure of tree failure to the point of snapping or uprooting. This approach provides a better understanding of the mechanical forces required to topple trees in tropical forests, and will inform models of wind throw disturbance. Across the topographic positions, size controlled variation in Mcrit was quantified for cardeiro (Scleronema mincranthum (Ducke) Ducke), mata-matá (Eschweilera spp.), and a random selection of trees from 19 other species. Our analysis of Mcrit revealed that tree resistance to failure increased with size (DBH and ABG) and differed among species. No effects of topography or failure mode were found for the species either separately or pooled. For the random species, total variance in Mcrit explained by tree size metrics increased from an R2 of 0.49 for DBH alone, to 0.68 when both DBH and stem fresh wood density (SWD) were included in a multiple regression model. This mechanistic approach allows the comparison of tree vulnerability induced by wind damage across ecosystems, and facilitates the use of forest structural information in ecosystem models that include variable resistance of trees to mortality inducing factors. Our results indicate that observed topographic differences in windthrow vulnerability are likely due to elevational differences in wind velocities, rather than by differences in soil-related factors that might effect Mcrit. © 2016en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 380, Pags. 1-10pt_BR
dc.rightsRestrito*
dc.subjectBiologyen
dc.subjectEcologyen
dc.subjectEcosystemsen
dc.subjectRegression Analysisen
dc.subjectBlow Downen
dc.subjectFunctional Traitsen
dc.subjectTree Allometryen
dc.subjectTree Static Winchingen
dc.subjectTurning Momenten
dc.subjectWind Disturbanceen
dc.subjectForestryen
dc.subjectAllometryen
dc.subjectDisturbanceen
dc.subjectEcological Modelingen
dc.subjectEcosystem Structureen
dc.subjectForest Ecosystemen
dc.subjectMortalityen
dc.subjectSoil Textureen
dc.subjectSpecies Diversityen
dc.subjectTreeen
dc.subjectTropical Foresten
dc.subjectVulnerabilityen
dc.subjectWind Velocityen
dc.subjectWindthrowen
dc.subjectWoody Planten
dc.subjectAmazoniaen
dc.subjectEschweileraen
dc.subjectScleronemaen
dc.titleMechanical vulnerability and resistance to snapping and uprooting for Central Amazon tree speciesen
dc.typeArtigopt_BR
dc.identifier.doi10.1016/j.foreco.2016.08.039-
dc.publisher.journalForest Ecology and Managementpt_BR
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