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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Seasonal changes in water sources used by woody species in a tropical coastal dune forest

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Antunes, C. [1, 2] ; Silva, C. [3] ; Maguas, C. [1] ; Joly, C. A. [4] ; Vieira, S. [2]
Total Authors: 5
[1] Univ Lisbon, CE3C, Fac Ciencias, Lisbon - Portugal
[2] Univ Estadual Campinas, Lab Ecol & Manejo Ecossistemas, Nucleo Estudos & Pesquisas Ambientais, Sao Paulo - Brazil
[3] Univ Estadual Campinas, PPG Biol Vegetal, Inst Biol, Sao Paulo - Brazil
[4] Univ Estadual Campinas, Inst Biol, Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: PLANT AND SOIL; v. 437, n. 1-2, p. 41-54, APR 2019.
Web of Science Citations: 1

AimsOur aim was to investigate the water sources used by woody species under contrasting water availability and the extent of water-sources-use differentiation among dominant woody species in a tropical coastal dune forest.MethodsWe sampled 15 woody species in a Brazilian restinga forest and, through Bayesian isotope mixing models, we estimated the proportion of water sources used. We tested whether water-sources-use was (i) different between contrasting water availability conditions; (ii) dependent on growth form, plant size or crown illumination; and (iii) influenced by stand density, evenness or biomass.ResultsWe found a seasonal variation in water-sources-use, but no vertical soil-water partitioning among woody species. In wetter periods, plants used mainly water from top-soil, as a shallow water table limited water uptake to top-soil layers recharged with rainwater. Contrastingly, during drier periods, with the absence of rain and a deeper water table, plants generally relied on deeper (50 cm) soil layers. Only under less-wet conditions, a greater evenness and density implied higher water-uptake depth heterogeneity among plants. However, changes in the main water-sources used by plants were neither evoked in more dense or diverse plots, nor induced by plant size.ConclusionsOur study shows that restinga species have dynamic shifts in water-uptake depth caused by seasonal water availability changes, influenced by the combined effect of insufficient moisture at shallow soil layers and water-table lowering in drier periods. These temporal shifts are common among species, implying that restinga woody community has a homogeneous strategy of water-resources acquisition. This study enhances our understanding of the effects that water variations can have on water-resource use in restinga forests. (AU)

FAPESP's process: 12/51872-5 - ECOFOR: Biodiversity and ecosystem functioning in degraded and recovering Amazonian and Atlantic Forests
Grantee:Carlos Alfredo Joly
Support type: BIOTA-FAPESP Program - Thematic Grants
FAPESP's process: 03/12595-7 - Floristic composition, structure and functioning of the Dense Rainforest nuclei of Picinguaba and Santa Virgínia of Parque Estadual da Serra do Mar, State of São Paulo, Brazil
Grantee:Carlos Alfredo Joly
Support type: BIOTA-FAPESP Program - Thematic Grants