Differences in leaf thermoregulation and water use strategies between three co-occurring Atlantic forest tree species

Autor(es)

Fauset, Sophie ^[1] ; Freitas, Helber C. ^[2] ; Galbraith, David R. ^[1] ; Sullivan, Martin J. P. ^[1] ; Aidar, Marcos P. M. ^[3] ; Joly, Carlos A. ^[4] ; Phillips, Oliver L. ^[1] ; Vieira, Simone A. ^[5] ; Gloor, Manuel U. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire - England

^[2] Univ Estadual Paulista, Dept Fis, Fac Ciencias, Ave Eng Luiz Edmundo Carrijo Coube 14-01, BR-17033360 Sao Paulo - Brazil

^[3] Inst Bot Sao Paulo, Ave Miguel Stefano, BR-04301902 Sao Paulo - Brazil

^[4] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Rua Monteiro Lobato, Cidade Univ, BR-13083862 Sao Paulo - Brazil

^[5] Univ Estadual Campinas, Nucleo Estudos & Pesquisas Ambientais, Rua Flamboyants 155, BR-13083867 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT CELL AND ENVIRONMENT; v. 41, n. 7, p. 1618-1631, JUL 2018.
• Citações Web of Science: 6

Resumo

Given anticipated climate changes, it is crucial to understand controls on leaf temperatures including variation between species in diverse ecosystems. In the first study of leaf energy balance in tropical montane forests, we observed current leaf temperature patterns on 3 tree species in the Atlantic forest, Brazil, over a 10-day period and assessed whether and why patterns may vary among species. We found large leaf-to-air temperature differences (maximum 18.3 degrees C) and high leaf temperatures (over 35 degrees C) despite much lower air temperatures (maximum 22 degrees C). Leaf-to-air temperature differences were influenced strongly by radiation, whereas leaf temperatures were also influenced by air temperature. Leaf energy balance modelling informed by our measurements showed that observed differences in leaf temperature between 2 species were due to variation in leaf width and stomatal conductance. The results suggest a trade-off between water use and leaf thermoregulation; Miconia cabussu has more conservative water use compared with Alchornea triplinervia due to lower transpiration under high vapour pressure deficit, with the consequence of higher leaf temperatures under thermal stress conditions. We highlight the importance of leaf functional traits for leaf thermoregulation and also note that the high radiation levels that occur in montane forests may exacerbate the threat from increasing air temperatures. (AU)

• Processo FAPESP: 12/51509-8 - Composição florística, estrutura e dinâmica do funcionamento da Floresta Ombrófila Densa Atlântica dos núcleos Caraguatatuba, Cunha, Picinguaba e Santa Virgínia, do Parque Estadual da Serra do Mar (PelD)
• Beneficiário: Carlos Alfredo Joly
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 12/51872-5 - ECOFOR: Biodiversidade e funcionamento de ecossistemas em áreas alteradas pelo homem nas Florestas Amazônica e Atlântica
• Beneficiário: Carlos Alfredo Joly
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 14/13322-9 - Ecofisiologia de Mata Atlântica: um novo modelo baseado em processos da comunidade
• Beneficiário: Sophie Fauset
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado