CHRISTOFFERSEN, B.

COSTA, A. C. L. da

FERREIRA, L.

KRUIJT, B.

MEIR, P.

MENCUCCINI, M.

ROWLAND, L.

VASCONCELOS, S.

Portuguese

Repository Open Access to Scientific Information from Embrapa

Resilience of Tropical Ecosystems – Future Challenges and Opportunities | Zurich, April 7-10, 2015IMPRESSUMEditorsChris J Kettle and Ainhoa MagrachEcosystem ManagementDepartment of Environmental  System Science Universitaetstrasse 16, CHN G75.1ETH Zurich 8092 Zurich SwitzerlandThe respective authors are solely responsible for the contents of their contributions in this book.Cover DesignWendy MartinFront cover photoHirzi LuqmanBack cover photoZurich Tourism and ETH ZurichConcept & Layoutroman.tschirf@gmail.comThis book is available at www.gtoe.dePrinted on 100% recycled paper.ISBN 978-3-00-048918-1RESILIENCE OF TROPICAL ECOSYSTEMS – FUTURE CHALLENGES AND OPPORTUNITIESAnnual Conference of the Society for Tropical Ecology (Gesellschaft für Tropenökologie e.V. – gtö)ETH Zürich, April 7-10, 20151159Resilience of Tropical Ecosystems – Future Challenges and Opportunities | Zurich, April 7-10, 2015SESSION 11-O1 - DROUGHT EFFECTS IN TROPICAL FORESTSRESPONSES TO SEVERE DROUGHT BY TROPICAL FOREST TREESPatrick Meir1,2, Lucy Rowland1, Antonio CL da Costa3, Maurizio Mencuccini1, Bradley Christoffersen1, Steel Vasconcelos4, Bart Kruijt5, Leandro Ferreira61University of Edinburgh, Edinburgh, UK, pwmeir@gmail.com2Australian National Unversity, Canberra, AU, pwmeir@gmail.com3Universidade Federal de Para, Belem, BR4Embrapa, Belem, BR5Alterra, Wageningen, NL6Museu Paraense Emilio Goeldi, Belem, BRTropical forests responses to drought include reductions in assimilation and growth, but under strong drought significant mortality can occur leading to substantial changes in the cycles of carbon and water, also affecting canopy structure and species composi-tion. Understanding of the drought-mortality process is particularly limited for tropical forests, despite the risk of drought to these ecosystems during the coming decades. We present new findings from the only current long-term ecosystem-scale   ha  rainfall manipulation experiment in tropical rainforest, the Esecaflor experiment at Caxiuana National Forest, Para State, Brazil. Throughfall has been partially excluded from experimental forest at the Esecaflor experiment for more than a decade. We have previously demonstrated a capacity to model short-term physiological responses well, but longer term physiology and ecological dynamics remain challenging to understand and represent. In particular, high mortality and increased autotrophic respiration fol-lowing extended drought are poorly understood phenomena, and their interaction with hydraulic responses and limitations needs to be characterised. We present initial data that combine carbon use and hydraulic metrics, comparing drought-vulnerable and non-vulnerable species that have experienced extended soil moisture deficit, as imposed in the experiment, and discuss modelling implications for this and other tropi-cal forest regions.THURSDAY 09:15

Responses to severe drought by tropical forest trees.

http://www.alice.cnptia.embrapa.br/bitstream/doc/1031479/1/P159.pdf

Responses to severe drought by tropical forest trees.

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