Root, shoot and leaf traits of the congeneric Styrax species may explain their distribution patterns in the cerrado sensu lato areas in Brazil
Gustavo Habermann A B and Anna C. G. Bressan A
+ Author Affiliations
- Author Affiliations
A Instituto de Biociências, UNESP – Univ Estadual Paulista, Departamento de Botânica, Av. 24-A, 1515, 13506-900 Rio Claro, SP, Brazil.
B Corresponding author. Email: ghaber@rc.unesp.br
Functional Plant Biology 38(3) 209-218 https://doi.org/10.1071/FP10182
Submitted: 2 September 2010 Accepted: 28 December 2010 Published: 29 March 2011
Abstract
Shoot and root lengths, the number of leaves, biomass and leaf area were measured in Styrax ferrugineus Nees and Mart., Styrax camporum Pohl. and Styrax pohlii A. DC cultivated in rhizotrons. Additionally, young individuals of these species were planted in a cerrado sensu stricto (s. str.), at the edge and in the understorey of a cerradão, and in the understorey of a riparian forest. Six months after planting, the specific leaf area (SLA) and the CO2 assimilation rate were assessed on an area (Aarea) and mass (Amass) basis. S. ferrugineus exhibited greater root and lower shoot length in comparison to S. pohlii. The high shoot growth and concomitantly substantial root length of S. camporum may illustrate why this species is widely distributed in the cerrado sensu lato areas, whereas the deep roots of S. ferrugineus could account for its occurrence in the cerrado s. str. In the field, an irradiance-diminishing gradient enlarged the SLA of S. pohlii, which positively influenced its Amass, and which could partially explain its occurrence in shady habitats. However, a non-plastic trait, such as the high shoot length of S. pohlii, is more likely to be responsible for the success of this species in forest habitats.
Additional keywords: Brazilian savanna, leaf gas exchange, photosynthetic capacity, Styracaceae, wet season.
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