Publication
Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest
| dc.contributor.author | Metcalfe, Daniel B. | |
| dc.contributor.author | Lobo-do-Vale, Raquel | |
| dc.contributor.author | Chaves, Maria Manuela | |
| dc.contributor.author | Maroco, João | |
| dc.contributor.author | Aragão, Luiz E. O. C. | |
| dc.contributor.author | Malhi, Yadvinder | |
| dc.contributor.author | Costa, António L. da | |
| dc.contributor.author | Braga, Alan P. | |
| dc.contributor.author | Gonçalves, Paulo L. | |
| dc.contributor.author | Athaydes, João de | |
| dc.contributor.author | Costa, Mauricio da | |
| dc.contributor.author | Almeida, Samuel S. | |
| dc.contributor.author | Campbell, Catherine | |
| dc.contributor.author | Hurry, Vaughan | |
| dc.contributor.author | Williams, Mathew | |
| dc.contributor.author | Meir, Patrick | |
| dc.date.accessioned | 2012-09-20T19:43:50Z | |
| dc.date.available | 2012-09-20T19:43:50Z | |
| dc.date.issued | 2010 | |
| dc.description.abstract | 1. The Amazon region may experience increasing moisture limitation over this century. Leaf dark respiration (R) is a key component of the Amazon rain forest carbon (C) cycle, but relatively little is known about its sensitivity to drought. 2. Here, we present measurements of R standardized to 25 C and leaf morphology from different canopy heights over 5 years at a rain forest subject to a large-scale through-fall reduction (TFR) experiment, and nearby, unmodified Control forest, at the Caxiuana˜ reserve in the eastern Amazon. 3. In all five post-treatment measurement campaigns, mean R at 25 C was elevated in the TFR forest compared to the Control forest experiencing normal rainfall. After 5 years of the TFR treatment, R per unit leaf area and mass had increased by 65% and 42%, respectively, relative to pre-treatment means. In contrast, leaf area index (L) in the TFR forest was consistently lower than the Control, falling by 23% compared to the pre-treatment mean, largely because of a decline in specific leaf area (S). 4. The consistent and significant effects of the TFR treatment on R, L and S suggest that severe drought events in the Amazon, of the kind that may occur more frequently in future, could cause a substantial increase in canopy carbon dioxide emissions from this ecosystem to the atmosphere. | por |
| dc.identifier.citation | Functional Ecology, 24, 524-533 | por |
| dc.identifier.issn | 0269-8463 | |
| dc.identifier.uri | http://hdl.handle.net/10400.12/1710 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | Wiley-Blackwell | por |
| dc.subject | Tropical forest | por |
| dc.subject | Climate change | por |
| dc.subject | Moisture deficit | por |
| dc.subject | Leaf dark respiration | por |
| dc.subject | Night-time foliar carbon emissions | por |
| dc.subject | Specific leaf area | por |
| dc.subject | Leaf area index | por |
| dc.subject | Through-fall exclusion experiment | por |
| dc.title | Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Oxford | por |
| oaire.citation.endPage | 533 | por |
| oaire.citation.startPage | 524 | por |
| oaire.citation.title | Functional Ecology | por |
| oaire.citation.volume | 24 | por |
| rcaap.rights | restrictedAccess | por |
| rcaap.type | article | por |