Soares Jancoski H., Marimon B.S., Scalon M.C., de Vasconcellos Barros F., Marimon Junior B.H., Carvalho E., Oliveira R.S., Oliveras Menor Imma. (2022). Distinct leaf water potential regulation of tree species and vegetation types across the Cerrado-Amazonia transition. Biotropica, 54 (2), 431-443. ISSN 0006-3606.
Titre du document
Distinct leaf water potential regulation of tree species and vegetation types across the Cerrado-Amazonia transition
Année de publication
2022
Auteurs
Soares Jancoski H., Marimon B.S., Scalon M.C., de Vasconcellos Barros F., Marimon Junior B.H., Carvalho E., Oliveira R.S., Oliveras Menor Imma
Source
Biotropica, 2022,
54 (2), 431-443 ISSN 0006-3606
The Cerrado-Amazonia transition harbors forest and savanna formations under the influence of pronounced climate seasonality; however,
the water use strategies of this key region is not yet well understood. This study aimed at deciphering in intra- and interspecific
variability in leaf water potential regulation among species across three distinct vegetation types (typical cerrado, cerradão, and
semideciduous seasonal forest) of the Cerrado-Amazonia transition region. We expected a variation across iso/anisohydric strategies
driven by plant-environment interactions and by species attributes (phenology and wood density). We selected 21 dominant species
(seven per vegetation type), recorded their phenological strategy and wood density, and measured leaf water potential (Psil) during
the dry and rainy seasons to analyze variations associated with minimum Psil, predawn Psil (Dela Psi pd), and midday Psi l (Dela Psi md) under the effect
of variable vapor pressure deficit (VPD). The variation in Psi l across species was higher in the dry season than in the rainy season for
all vegetation types. Most species from typical cerrado and cerradão showed similar behavior patterns, with higher Psil regulation under
high VPD and lower Dela Psi pd. In contrast, most forest species showed lower regulation under high VPD, and higher Delta Psi pd. Total or partial
deciduousness together with strong stomatal regulation seems to be common water regulation strategies in the dry season for cerrado
species but not for forest species. Our results suggest that, if drought events become more intense and frequent as predicted, seasonal
forest species may be more vulnerable due to their lower Psi l regulation.
Plan de classement
Sciences du milieu [021]
;
Hydrologie [062]
;
Sciences du monde végétal [076]
;
Etudes, transformation, conservation du milieu naturel [082]
Localisation
Fonds IRD [F B010092539]
Identifiant IRD
fdi:010092539
