Death From Drought In Tropical Forests Is Triggered By Hydraulics Not Carbon Starvation

dc.creatorRowland
dc.creatorL.; da Costa
dc.creatorA. C. L.; Galbraith
dc.creatorD. R.; Oliveira
dc.creatorR. S.; Binks
dc.creatorO. J.; Oliveira
dc.creatorA. A. R.; Pullen
dc.creatorA. M.; Doughty
dc.creatorC. E.; Metcalfe
dc.creatorD. B.; Vasconcelos
dc.creatorS. S.; Ferreira
dc.creatorL. V.; Malhi
dc.creatorY.; Grace
dc.creatorJ.; Mencuccini
dc.creatorM.; Meir
dc.creatorP.
dc.date2015-DEC
dc.date2016-06-07T13:36:11Z
dc.date2016-06-07T13:36:11Z
dc.date.accessioned2018-03-29T01:51:35Z
dc.date.available2018-03-29T01:51:35Z
dc.identifier
dc.identifierDeath From Drought In Tropical Forests Is Triggered By Hydraulics Not Carbon Starvation. Nature Publishing Group, v. 528, p. 119-+ DEC-2015.
dc.identifier0028-0836
dc.identifierWOS:000365606000060
dc.identifier10.1038/nature15539
dc.identifierhttp://www.nature.com/nature/journal/v528/n7580/full/nature15539.html
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/244265
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1307963
dc.descriptionDrought threatens tropical rainforests over seasonal to decadal timescales(1-4), but the drivers of tree mortality following drought remain poorly understood(5,6). 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.
dc.description528
dc.description7580
dc.description
dc.description119
dc.description+
dc.descriptionUK NERC [NE/J011002/1]
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionARC [FT110100457]
dc.descriptionNERC [NER/A/S/2002/00487, GR3/11706, NE/D01025X/1]
dc.descriptionEU FP5-Carbonsink
dc.descriptionEU FP7-Amazalert
dc.descriptionGordon and Betty Moore Foundation
dc.description
dc.description
dc.description
dc.languageen
dc.publisherNATURE PUBLISHING GROUP
dc.publisher
dc.publisherLONDON
dc.relationNATURE
dc.rightsfechado
dc.sourceWOS
dc.subjectAmazonian Rain-forest
dc.subjectEastern Amazon
dc.subjectFoliar Uptake
dc.subjectDie-off
dc.subjectTree
dc.subjectClimate
dc.subjectWater
dc.subjectMortality
dc.subjectVulnerability
dc.subjectDynamics
dc.titleDeath From Drought In Tropical Forests Is Triggered By Hydraulics Not Carbon Starvation
dc.typeArtículos de revistas


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