Seasonal cambium activity in the subtropical rain forest tree Araucaria angustifolia |
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Authors: | Juliano Morales Oliveira Emiliano Santarosa Valério DePatta Pillar Fidel Alejandro Roig |
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Institution: | (1) Laboratório de Ecologia Quantitativa, Departamento de Ecologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91540-000, Brazil;(2) Laboratorio de Dendrocronología, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, Centro Científico Tecnológico CONICET-Mendoza, CC 330, 5500 Mendoza, Argentina |
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Abstract: | Information on the timing and dynamics of tree ring formation is essential to assess the seasonal behavior of secondary wood
growth and its associated environmental influences. Araucaria angustifolia is a dominant species in highland pluvial ecosystems of southeastern South America. Previous investigations indicated that
their growth rings are formed annually, but no information exists about the timing of growth ring formation and the environmental
triggers influencing cambium activity. In this paper we examine inter- and intra-annual cambial activity in A. angustifolia, through anatomical and dendrochronological evidence at two study sites, and model the relationships between regional climate
variation and intra-annual tree ring formation. The results confirm the annual growth ring formation in A. angustifolia and indicate that its growth season extends from October to April. Day length and temperature were the main environmental
factors influencing the seasonal cambium activity. Our results evidence the dendrochronological potential of A. angustifolia for ecological and climatological studies in southeastern South America. |
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Keywords: | Cambium activity Growth ring Secondary growth Wood anatomy |
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