Data/hora: 03/06/2024 04:29:25

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 02/12/2015
Data da última atualização: | 27/05/2022
Autoria: | ROWLAND, L.; COSTA, A. C. L. da; GALBRAITH, D. R.; OLIVEIRA, R. S.; BINKS, O. J.; OLIVEIRA, A. A. R.; PULLEN, A. M.; DOUGHTY, C. E.; METCALFE, D. B.; VASCONCELOS, S. S.; FERREIRA, L. V.; MALHI, Y.; GRACE, J.; MENCUCCINI, M.; MEIR, P.
Afiliação: | L. Rowland, University of Edinburgh; A. C. L. da Costa, UFPA; D. R. Galbraith, University of Leeds; R. S. Oliveira, UNICAMP; O. J. Binks, University of Edinburgh; A. A. R. Oliveira, UFPA; A. M. Pullen, University of Cambridge; C. E. Doughty, University of Oxford; D. B. Metcalfe, Lund University; STEEL SILVA VASCONCELOS, CPATU; L. V. Ferreira, MPEG; Y. Malhi, University of Oxford; J. Grace, University of Edinburgh; M. Mencuccini, University of Edinburgh / ICREA at CREAF; P. Meir, University of Edinburgh / Australian National University.
Título: | Death from drought in tropical forests is triggered by hydraulics not carbon starvation.
Ano de publicação: | 2015
Fonte/Imprenta: | Nature, v. 528, N. 7580, p. 119-122, 3 Dec. 2015.
DOI: | 10.1038/nature15539
Idioma: | Inglês
Conteúdo: | Drought threatens tropical rainforests over seasonal to decadal timescales1, 2, 3, 4, but the drivers of tree mortality following drought remain poorly understood5, 6. It has been suggested that reduced availability of non-structural carbohydrates (NSC) critically increases mortality risk through insufficient carbon supply to metabolism (?carbon starvation?)7, 8. However, little is known about how NSC stores are affected by drought, especially over the long term, and whether they are more important than hydraulic processes in determining drought-induced mortality. Using data from the world?s longest-running experimental drought study in tropical rainforest (in the Brazilian Amazon), we test whether carbon starvation or deterioration of the water-conducting pathways from soil to leaf trigger tree mortality. Biomass loss from mortality in the experimentally droughted forest increased substantially after >10 years of reduced soil moisture availability. The mortality signal was dominated by the death of large trees, which were at a much greater risk of hydraulic deterioration than smaller trees. However, we find no evidence that the droughted trees suffered carbon starvation, as their NSC concentrations were similar to those of non-droughted trees, and growth rates did not decline in either living or dying trees. Our results indicate that hydraulics, rather than carbon starvation, triggers tree death from drought in tropical rainforest.
Palavras-Chave: | Ecossistema ecológico; Morte.
Thesagro: | Árvore; Floresta Tropical; Mudança Climática; Seca.
Categoria do assunto: | K Ciência Florestal e Produtos de Origem Vegetal
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (51816-1) - UPC - AP - DD -  -  -  - DIS