| Full text | |
| Author(s): |
Total Authors: 5
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| Affiliation: | [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
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| Document type: | Journal article |
| Source: | PLANT AND SOIL; v. 437, n. 1-2, p. 41-54, APR 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
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 Opportunities: | 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 Opportunities: | BIOTA-FAPESP Program - Thematic Grants |