Periodicity of growth rings in some flood-prone trees of the Atlantic Rain Forest in Rio de Janeiro, Brazil |
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Authors: | Cátia Callado Sebastião da Silva Neto Fábio Scarano Cecília Costa |
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Affiliation: | Universidade do Estado do Rio de Janeiro – IBRAG/DBAV, Rua S?o Francisco Xavier, 524 PHLC, sala 224, Maracan? 20550–000, Rio de Janeiro, Brazil, Funda??o Botanica Margaret Mee / Programa Mata Atlantica / Instituto de Pesquisas Jardim Botanico do Rio de Janeiro, Rua Pacheco Le?o 915, Jardim Botanico 22460–030, Rio de Janeiro, Brazil, Universidade Federal do Rio de Janeiro, Departamento de Ecologia, IB, CCS, Ilha do Fund?o, Caixa Postal 68020, 21941–970, Rio de Janeiro, Brazil, Instituto de Pesquisas Jardim Botanico do Rio de Janeiro, Rua Jardim Botanico 1008, Jardim Botanico, 20460–000, Rio de Janeiro, Brazil,
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Abstract: | The periodicity of growth ring formation was studied in Tabebuia cassinoides (Lam.) DC, Tabebuia umbellata (Sond.) Sandwith, Symphonia globulifera L., and Alchornea sidifolia Müll. Arg. in a swamp forest within the Atlantic Rain Forest of the state of Rio de Janeiro, southeastern Brazil. Mechanical wounds of the vascular cambium allowed cyclic growth to be observed, and the position of latewood relative to the wounds was analysed. Radial growth was correlated with phenology, temperature, precipitation, photoperiod, flooding regime, and endogenous rhythms. All species showed annual growth rings; however, there were different patterns of radial growth. Phenology was an important factor influencing the activity of the vascular cambium. The period of leaf abscission was correlated with the formation of latewood in three of the species studied, but it occurred at different times for each species. Flooding was a determinant of periodic growth in T. cassinoides; photoperiod was indirectly responsible for radial growth rhythm in T. umbellata, and endogenous rhythms accounted for the radial growth rhythm of S. globulifera and A. sidifolia. |
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