Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/1079
Título: Vertical distance from drainage drives floristic composition changes in an Amazonian rainforest
Autor(es): SCHIETTI, JULIANA
EMILIO, THAISE
RENNÓ, CAMILO D.
DRUCKER, DEBORA P.
Flávia Regina Capellotto Costa
NOGUEIRA, ANSELMO
Fabricio Beggiato Baccaro
FIGUEIREDO, FERNANDO
Carolina Volkmer de Castilho
KINUPP, VALDELY
Jean-Louis Guillaumet
GARCIA, ANA RAQUEL M.
Albertina Pimentel Lima
William Ernest Magnusson
Assunto: water table
beta diversity
plant species
ISSN: 1755-0874
Revista: Plant Ecology & Diversity
Volume: 7
Resumo: Background: Plant composition changes with topography and edaphic gradients that correlate with soil-water and nutrient availability. Data on soil water for the Amazon Basin are scarce, limiting the possibility of distinguishing between soil and soil-water influences on plant composition. Aim: We tested a new proxy for water table depth, the terrain height above nearest drainage (HAND), as a predictor of composition in trees, lianas, palms, shrubs, and herbs and compared HAND to conventional measures of height above sea level (HASL) and horizontal distances from nearest drainage (HDND). Methods: Plant-species composition in 72 plots distributed across 64 km2 of lowland evergreen terra firme forest was summarised using non-metric multidimensional scaling (NMDS). NMDS scores were regressed against estimates of HAND, HASL and HDND. Results: Plant composition was highly correlated with the vertical distance from water table, capturing up to 82% of variation. All life forms showed highest turnover rates in the zone with seasonally water-saturated soils, which can extend 350 m from stream margins. Conclusions: Floristic composition is closely related to water table depth, and HAND appears to be the most robust available topographical metric of soil-water gradients. Brazilian conservation laws protecting 30-m-wide riparian buffers are likely to be too narrow to encompass the full zone of highest floristic turnover and may be ineffective in safeguarding riparian plant diversity.
URI: http://repositorio.inpa.gov.br/handle/123/1079
ISSN: 1755-0874
DOI: https://dx.doi.org/10.1080/17550874.2013.783642
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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