CHRISTOFFERSEN, B.

COSTA, A. C. L. da

FERREIRA, L.

MEIR, P.

MENCUCCINI, M.

ROWLAND, L.

VASCONCELOS, S.

English

Repository Open Access to Scientific Information from Embrapa

OOS 58-6Resistance and mortality in tropical forest trees during experimental droughtThursday, August 13, 2015: 9:50 AM310, Baltimore Convention CenterPatrick Meir, School of Geosciences, University of Edinburgh, Edinburgh, Scotland ; Research School of Biology,Australian National University, Canberra, AustraliaLucy Rowland, School of GeoSciences, University of Edinburgh, Edinburgh, United KingdomACL da Costa, Geosciences, Federal University of Para, Belém, BrazilSteel Vasconcelos, , Embrapa, Belem, BrazilMaurizio Mencuccini, , ICREA - CREAF and University of Edinburgh, Edinburgh, United KingdomBradley Christo4ersen, Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, USALeandro Ferreira, , Museu Paraense Emilio Goeldi, Belém, BrazilBackground/Question/MethodsSevere drought has been shown repeatedly to lead to significant mortality in tropical forests, from SE Asia toAmazonia. The e4ects can be large, even for single severe droughts, sometimes switching the sign of net carbon fluxto/from the land surface. Representing sensitivity to moisture availability remains a challenge for vegetation models,especially those used to represent vegetation change, with consequent uncertainty in predictions of the e4ects ofincreased frequency or severity of drought on the tropical forest carbon cycle. Part of the di4iculty is that we have aninsu4icient understanding of the tree mortality process during drought; this is true for forests globally, but is especiallytrue for tropical forests for which fewer data are available. Here, we use a uniquely long-running soil moisturemanipulation study in Amazonia to address this question. A large-scale throughfall exclusion study has beenmaintained at an eastern Amazon forest site since 2002. We have previously reported empirical and modelling resultsfor the response in productivity, growth and mortality to long term soil moisture deficit.Results/ConclusionsHere we present new long term (13 yr) growth and  mortality data to test whether the strong mortality response todrought at this forest continues under extended drought, or whether we see recovery; we also examine how growthrates behave in the context of potentially lethal drought stress. In addition, we divide groups of taxa previouslyobserved to be vulnerable or resistant to drought in terms of their mortality risk and use the drought manipulationtreatment to test for di4erences in key ecophysiological traits, such as gas exchange capacity, non-structuralcarbohydrate content, autotrophic respiration and plant hydraulics. Our results include evidence of some grouping byhydraulic parameters, surprisingly few di4erences in photosynthetic capacity, and notable di4erences in autotrophicrespiration rates. We will use our results in combination with those from other studies to develop and test dynamicAbstract: Resistance and mortality in tropical forest trees during... http://esa.org/meetings_archive/2015/webprogram/Paper51476...1 de 2 02/03/2016 14:18When: August 09 - 14, 2015Where: Baltimore, MDvegetation model performance, with a particular focus on regional di4erences or similarities in tropical forest droughtresponse characteristics.See more of: The Ecological Impacts of Drought As Revealed Through Experimental ApproachesSee more of: Organized Oral Sessions<< Previous Abstract | Next Abstract >>StartSearchBrowse by DayAuthor IndexMeeting InformationAdditional InformationMeeting WebsiteAbout BaltimoreBaltimore Transit© 2015 ESAAbstract: Resistance and mortality in tropical forest trees during... http://esa.org/meetings_archive/2015/webprogram/Paper51476...2 de 2 02/03/2016 14:18

Resistance and mortality in tropical forest trees during experimental drought.

http://www.alice.cnptia.embrapa.br/bitstream/doc/1039360/1/rESISTANCE.pdf

Resistance and mortality in tropical forest trees during experimental drought.

Abstract

Similar works

Full text

Available Versions

Repository Open Access to Scientific Information from Embrapa