Distinct leaf water potential regulation of tree species and vegetation types across the Cerrado–Amazonia transition

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 potentia...

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Bibliographic Details
Published in:Biotropica 2022-03, Vol.54 (2), p.431-443
Main Authors: Soares Jancoski, Halina, Schwantes Marimon, Beatriz, C. Scalon, Marina, de V. Barros, Fernanda, Marimon‐Junior, Ben Hur, Carvalho, Eder, S. Oliveira, Rafael, Oliveras Menor, Imma
Format: Article
Language:English
Subjects:
Biodiversity
Biodiversity and Ecology
Botanics
Density
Dominant species
Drought
Dry season
Ecology, environment
Ecosystems
Environmental regulations
Environmental Sciences
forest
Forests
Harbors
hydraulic strategies
Leaves
Life Sciences
Neotropical
phenology
Plant species
Pressure effects
Rainy season
savanna
Savannahs
Seasonal variations
Seasonality
Seasons
Stomata
Systematics, Phylogenetics and taxonomy
Threatened species
Vapor pressure
vapor pressure deficit
Vapors
Vapour pressure
Variation
Vegetal Biology
Vegetation
Vegetation type
Water potential
Water use
Wet season
Wood
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Summary: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 (Ψl) during the dry and rainy seasons to analyze variations associated with minimum Ψl, predawn Ψl (ΔΨpd), and midday Ψl (ΔΨmd) under the effect of variable vapor pressure deficit (VPD). The variation in Ψl 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 Ψl regulation under high VPD and lower ΔΨpd. In contrast, most forest species showed lower regulation under high VPD, and higher ΔΨpd. 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 Ψl regulation. in Portuguese is available with online material. Resumo A transição Cerrado‐Amazônia abriga formações florestais e savânicas sob a influência de acentuada sazonalidade climática; no entanto, as estratégias de uso da água nesta região chave ainda não são bem compreendidas. Este estudo visa decifrar a variabilidade intra e interespecífica na regulação do potencial hídrico foliar entre as espécies em três fitosocionamias (cerrado típico, cerradão e floresta estacional semidecidual) da região de transição Cerrado‐Amazônia. Esperávamos uma variação nas estratégias iso / anisoídricas por causa das interações planta‐ambiente, bem como pelos atributos das espécies (fenologia e densidade da madeira). Selecionamos 21 espécies dominantes (sete por fitofisionomia), registramos sua estratégia fenológica e densidade da madeira, e medimos
ISSN:0006-3606
1744-7429
DOI:10.1111/btp.13064