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Hydraulic architecture of crown in three Brazilian species

In: IAWA Journal
Authors:
Olívia Pereira Lopes Laboratório de Anatomia da Madeira, Universidade Federal de Uberlândia, Avenida XV de novembro 521, Boa Vista, CEP 38500000, MG, Brazil

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https://orcid.org/0000-0001-6158-4765
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Valentina Buttò Département des Sciences Fondamentales, Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, QC, Canada G7H 2B1
Institut de recherche sur les forêts (IRF), Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC, Canada J9X 5E4

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https://orcid.org/0000-0003-1595-6745
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Sergio Rossi Département des Sciences Fondamentales, Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, QC, Canada G7H 2B1

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https://orcid.org/0000-0002-9919-0494
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Bruna Zanatto Instituto de Pesquisas Ambientais, Centro de Inovação Tecnológica, Avenida Professor Frederico Hermann Junior 345, Alto de Pinheiros, Code 05459-900, SP, Brazil

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Guillermo Angeles A.C. Red de Ecología Funcional, Instituto de Ecología, VER 11 351, El Haya, 91070 Xalapa-Enríquez, Veracruz, México

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https://orcid.org/0000-0002-0455-4997
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Eduardo Luiz Longui Instituto de Pesquisas Ambientais, Centro de Inovação Tecnológica, Avenida Professor Frederico Hermann Junior 345, Alto de Pinheiros, Code 05459-900, SP, Brazil

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https://orcid.org/0000-0002-7610-9147
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Summary

The hydraulic limitation hypothesis postulates an increase in resistance to water conductivity as trees become taller. Accordingly, we expect that the hydraulic architecture of trees shares a close relationship with the crown architecture and that anatomical traits can directly or indirectly influence hydraulic conductivity. The aim of this work was to investigate the variations in vessels, hydraulic properties and wood density of three native Brazilian tree species. We selected 40-year-old Balfourodendron riedelianum, Cariniana legalis and Handroanthus vellosoi trees and measured maximum vessel length, specific hydraulic conductivity, the percentage loss of conductivity, leaf hydraulic conductivity, and density of branches at three different positions of the crown. Variability in anatomical and hydraulic properties was mostly explained by differences between species, while small differences were related to the position of the branch along the crown-position gradient. Within the measured variables, only the maximum vessel length differed between one crown position and the other. We posit that poor differences between anatomical and hydraulic positions in the crown-position gradient could be related to sample positions within the crown, which were relatively close to each other, with branches having similar ages and diameters. Our findings demonstrate that despite growing in the same environment and having the same age, our species deploy contrasting carbon allocation and hydraulic species-specific strategies. These strategies mirror different growth performances resulting from a different trade-off between hydraulic capacity and safety.

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