| Texto completo | |
| Autor(es): |
Rosado, Bruno H. P.
[1]
;
Oliveira, Rafael S.
[1]
;
Joly, Carlos A.
[1]
;
Aidar, Marcos P. M.
[2]
;
Burgess, Stephen S. O.
[3, 4]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Dept Biol Vegetal, IB, Campinas, SP - Brazil
[2] Inst Bot, Secao Fisiol & Bioquim Plantas, Sao Paulo - Brazil
[3] Univ Western Australia, Sch Plant Biol, Perth, WA 6009 - Australia
[4] Univ Sydney, Fac Agr Food & Nat Resources, Sydney, NSW 2006 - Australia
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Agricultural and Forest Meteorology; v. 158, p. 13-20, JUN 15 2012. |
| Citações Web of Science: | 30 |
| Resumo | |
Nighttime transpiration (NT) has been documented in many plant species but we do not yet have a thorough understanding of the abiotic and biotic controls of this phenomenon. In this study we examined interspecific variation in NT behaviors in plants with distinct crown exposures (CE) and occurring at lowland (100 m) and montane forests (1000 m) in the Brazilian Atlantic rainforest to answer the following questions: are there different NT behaviors in plants subjected to distinct conditions associated with degree of CE and/or altitude? Are there higher rates of NT relative to daily maximum values at the montane forest due to higher vapor pressure deficit (VPD)? Taking into account that low VPD should generally produce low relative NT fluxes, should we expect that understory species in both altitudes will have quite uniform low relative rates of NT in comparison to overstory species owing to the buffered nature of within-canopy microclimate? NT did show differences between altitude and species. Of most significance was a prominent non-linear relationship between the NT and VPD, observed at the montane site. This non-linearity is in contrast to most previously published NT kinetics and suggests stomatal and/or leaf energy balance controls on NT. Our findings raise a new perspective concerning thermodynamic contributions to non-linear NT kinetics and some possible reasons for this interesting behavior are discussed. (C) 2012 Elsevier BM. All rights reserved. (AU) | |
| Processo FAPESP: | 03/12595-7 - Composição florística, estrutura e funcionamento da Floresta Ombrófila Densa dos Núcleos Picinguaba e Santa Virgínia do Parque Estadual da Serra do Mar, estado de São Paulo, Brasil |
| Beneficiário: | Carlos Alfredo Joly |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Temático |