Rainforest trees respond to drought by modifying their hydraulic architecture
Tng, David Y. P. (James Cook University. Centre for Tropical Environmental and Sustainability Science (Austràlia))
Apgaua, Deborah Mattos Guimarães (James Cook University. Centre for Tropical Environmental and Sustainability Science (Austràlia))
Ishida, Yoko F. (James Cook University. Centre for Tropical Environmental and Sustainability Science (Austràlia))
Mencuccini, Maurizio (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Lloyd, Jonathan (James Cook University. Centre for Tropical Environmental and Sustainability Science (Austràlia))
Laurance, William F. (James Cook University. Centre for Tropical Environmental and Sustainability Science (Austràlia))
Laurance, Susan (James Cook University. Centre for Tropical Environmental and Sustainability Science (Austràlia))

Fecha:	2018
Resumen:	Increased drought is forecasted for tropical regions, with severe implications for the health and function of forest ecosystems. How mature forest trees will respond to water deficit is poorly known. We investigated wood anatomy and leaf traits in lowland tropical forest trees after 24 months of experimental rainfall exclusion. Sampling sun-exposed young canopy branches from target species, we found species-specific systematic variation in hydraulic-related wood anatomy and leaf traits in response to drought stress. Relative to controls, drought-affected individuals of different tree species variously exhibited trait measures consistent with increasing hydraulic safety. These included narrower or less vessels, reduced vessel groupings, lower theoretical water conductivities, less water storage tissue and more abundant fiber in their wood, and more occluded vessels. Drought-affected individuals also had thinner leaves, and more negative pre-dawn or mid-day leaf water potentials. Future studies examining both wood and leaf hydraulic traits should improve the representation of plant hydraulics within terrestrial ecosystem and biosphere models, and help fine-tune predictions of how future climate changes will affect tropical forests globally.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Drought ; Functional anatomy ; Plant hydraulics ; Throughfall exclusion ; Trait plasticity ; Tropical rainforest
Publicado en:	Ecology and evolution, Vol. 8, issue 24 (December 2018) , p. 12479-12491, ISSN 2045-7758

DOI: 10.1002/ece3.4601
PMID: 30619559

13 p, 1.1 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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