Dendroclimatologia da espécie arbórea Macrolobium acaciifolium (Fabaceae) em florestas de igapó na Amazônia central
Forest dynamics in the Amazonian floodplains is strongly triggered by the flood-pulse. Trees respond to the unfavorable growth conditions during the flooded period by a cambial dormancy resulting in the formation of annual growth rings. In this study by indexed tree-ring chronologies of the tree...
| Autor principal: | Batista, Eliane Silva |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12628 http://lattes.cnpq.br/0320211310861330 |
| Resumo: |
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Forest dynamics in the Amazonian floodplains is strongly triggered by the flood-pulse.
Trees respond to the unfavorable growth conditions during the flooded period by a
cambial dormancy resulting in the formation of annual growth rings. In this study by
indexed tree-ring chronologies of the tree species Macrolobium acaciifolium were
established and compared with hydrological and climatic factors from three different
black-water floodplain forests (igapó) in Central Amazonia growing under nutrient-poor
conditions (Amanã and Uatumã Sustainable Development Reserves – RDSA e RDSU,
respectively, National Park Anavilhanas - PNA). For data sampling in the field 20
emergent trees with diameter at breast height (DBH) above 60 cm were chosen at each
site. Diameter and inundation height of each tree was measured and a wood sample of the
trunk was obtained by an increment borer. Wood samples were sanded and tree rings
were identified by marginal parenchyma bands to determine tree age and mean diameter
increment rates. By cross-dating techniques indexed tree-ring chronologies were
constructed for the PNA (1752-2006) and RDSU (1758-2004) using ten trees at each site.
For the RDSA it was not possible to develop a tree-ring chronology due to a low number
of samples with congruent ring-width patterns. Maximum tree age at the three sites varied
between 341 years at RDSA, 418 years at PNA and 443 years at the RDSU. Diameter
increment rates did not significantly differ between the three studied sites. Ring-width
indices were significantly correlated with the duration of the terrestrial phase calculated
from nearby hydrological stations for the period 1973-2008. Signals from sea surface
temperature (SST) anomalies were more evident in the tree-ring series at the RDSU
compared to the PNA. El Niño signals were not detected in the tree-ring chronologies. |