Effects of cold conditions on the growth rates of a subtropical conifer

Autor(es)

Scipioni, Marcelo Callegari ^[1] ; Fontana, Claudia ^[2] ; Oliveira, Juliano Morales ^[3] ; Junior, Luiz Santini ^[4] ; Roig, Fidel A. ^{[4, 5]} ; Tomazello-Filho, Mario ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Santa Catarina UFSC, Lab Recursos Florestais, Rod Ulysses Gaboardi, Km 03, BR-89520000 Florianopolis, SC - Brazil

^[2] Univ Sao Paulo, ESALQ, Identificacao Densitometria RaiosX Madeira, Lab Anat, BR-13418900 Sao Paulo, SP - Brazil

^[3] Univ Vale Rio Sinos UNISINOS, Lab Ecol Vegetal, Av Unisinos 950, BR-93022750 Sao Leopoldo, RS - Brazil

^[4] Univ Mayor, Fac Ciencias, Hemera Ctr Observac Tierra, Escuela Ingn Forestal, Santiago - Chile

^[5] CONICET Univ Nacl Cuyo, IANIGLA, Lab Dendrocronol Historia Ambiental, Mendoza - Argentina

• Tipo de documento: Artigo Científico
• Fonte: DENDROCHRONOLOGIA; v. 68, AUG 2021.
• Citações Web of Science: 1

Resumo

Araucaria angustifolia is an endangered species that occurs in the high and cold regions of southern Brazil. This species has economic importance due to its wood and seeds, as well as playing a fundamental ecological role for the southern fauna and flora. Climate change can affect its distributional area and conservation, making it urgent to investigate the effect of climate on its development. The objective of our study was to investigate how growth rates of A. angustifolia vary in relation to interannual precipitation, temperature, frost and snowfall events. For this purpose, we used two samples obtained from each of 33 individual trees from a forest fragment on the Santa Catarina plateau, Brazil. Classical dendrochronological methods were applied for the preparation and dating of the samples. The tree rings were measured using specialized software. Superposed Epoch analysis was used to test the snow accumulation events. The climatic variables were tested by means of a correlation analysis. The Superposed Epoch analysis was used to test the snow accumulation events. Our results indicate that the species shows significant sensitivity to the climate, with the maximum and minimum absolute temperatures respectively correlated with positive and negative growth rates. Snowfall also reduced growth of A. angustifolia. Overall, extreme cold events are threats to the conservation of the species. (AU)

• Processo FAPESP: 19/27110-7 - Densitometria de raios-X para identificação e medição de anéis de árvores em espécies semi-áridas
• Beneficiário: Cláudia Fontana
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/50085-3 - PIRE: educação e pesquisa em clima das Américas usando os exemplos de anéis de árvores e espeleotemas (PIRE-CREATE)
• Beneficiário: Francisco William da Cruz Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/53951-7 - EMU: implantação de laboratório multiusuário especializado em métodos de espectroscopia de infravermelho próximo (NIR) e de densitometria de raios X em aplicações agro-florestais
• Beneficiário: Mario Tommasiello Filho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários