Drought stress and tree size determine stem CO2 efflux in a tropical forest
Rowland, Lucy (University of Exeter. College of Life and Environmental Sciences)
da Costa, Antonio C. L. (Universidade Federal do Pará. Instituto de Geosciências)
Oliveira, Alex A. R. (Museu Paraense Emílio Goeldi (Brasil))
Oliveira, Rafael S. (Universidade Estadual de Campinas. Instituto de Biologia (Brasil))
Bittencourt, Paulo L. (Universidade Estadual de Campinas. Instituto de Biologia (Brasil))
Costa, Patricia B. (Universidade Estadual de Campinas. Instituto de Biologia (Brasil))
Giles, Andre L. (Universidade Estadual de Campinas. Instituto de Biologia (Brasil))
Sosa, Azul I. (Universidade Estadual de Campinas. Instituto de Biologia (Brasil))
Coughlin, Ingrid (Universidade de São Paulo. Departamento de Biologia (Brasil))
Godlee, John L. (University of Edinburgh. School of GeoSciences)
Vasconcelos, Steel S. (Embrapa Amazonia Oriental (Brasil))
Junior, João A. S. (Universidade Federal do Pará. Instituto de Geosciências)
Ferreira, Leandro V. (Museu Paraense Emílio Goeldi (Brasil))
Mencuccini, Maurizio (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Meir, Patrick (Australian National University. Research School of Biology)
Institució Catalana de Recerca i Estudis Avançats

Data:	2018
Resum:	- CO₂ efflux from stems (CO₂_stem) accounts for a substantial fraction of tropical forest gross primary productivity, but the climate sensitivity of this flux remains poorly understood. - We present a study of tropical forest CO₂_stem from 215 trees across wet and dry seasons, at the world's longest running tropical forest drought experiment site. - We show a 27% increase in wet season CO₂_stem in the droughted forest relative to a control forest. This was driven by increasing CO₂_stem in trees 10-40 cm diameter. Furthermore, we show that drought increases the proportion of maintenance to growth respiration in trees > 20 cm diameter, including large increases in maintenance respiration in the largest droughted trees, > 40 cm diameter. However, we found no clear taxonomic influence on CO₂_stem and were unable to accurately predict how drought sensitivity altered ecosystem scale CO₂_stem, due to substantial uncertainty introduced by contrasting methods previously employed to scale CO₂_stem fluxes. - Our findings indicate that under future scenarios of elevated drought, increases in CO₂_stem may augment carbon losses, weakening or potentially reversing the tropical forest carbon sink. However, due to substantial uncertainties in scaling CO₂_stem fluxes, stand-scale future estimates of changes in stem CO₂ emissions remain highly uncertain.
Nota:	ALTRES AJUTS: NE/N014022/1, NE/J011002/1
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Drought ; Growth respiration ; Maintenance respiration ; Stem CO2 efflux ; Tropical rainforests ; Woody tissue respiration
Publicat a:	The new phytologist, Vol. 218 Núm. 4 (june 2018) , p. 1393-1405, ISSN 1469-8137

DOI: 10.1111/nph.15024
PMID: 29397028

13 p, 1.1 MB

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