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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Interspecific variation in branch and leaf traits among three Syzygium tree species from different successional tropical forests

Shi-Dan Zhu A , Ya-Jun Chen B , Kun-Fang Cao C and Qing Ye A D
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.

B Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China.

C State Key Laboratory for Conservation and Utilisation of Subtropical Agro-bioresources, the Key Laboratory of Ministry of Education for Microbial and Plant Genetic Engineering, and College of Forestry, Guangxi University, Nanning 530004, China.

D Corresponding author. Email: qye@scbg.ac.cn

Functional Plant Biology 42(4) 423-432 https://doi.org/10.1071/FP14201
Submitted: 22 July 2014  Accepted: 15 January 2015   Published: 13 February 2015

Abstract

Plant functional traits are closely associated with plant habitats. In this study, we investigated the interspecific variations in stem and leaf hydraulics, xylem and leaf anatomy, gas-exchange rates and leaf pressure–volume relationships among three Syzygium tree species in early, mid- and late successional tropical forests. The objective was to understand the response and adaptation of congeneric species, in terms of branch and leaf functional traits, to different environments. A consistent pattern of decline with succession was evident in leaf and sapwood specific hydraulic conductivity (ks), maximum leaf hydraulic conductance (Kleaf), and photosynthetic rates for the three Syzygium species. Variations of ks and Kleaf were correlated with changes in vessel anatomy (i.e. vessel density and diameter) and leaf flux-related structure (i.e. stomatal pore index and vein density) respectively. However, specific leaf area and leaf to sapwood area ratio did not significantly differ among the three species. In addition, the mid-successional species had the lowest values of leaf water potential at full turgor and turgor loss point and 50% loss of Kleaf, but the greatest value of xylem water potential at 50% loss of ks. Our results demonstrate that leaf and branch traits associated with photosynthesis and/or hydraulic conductance, rather than those associated with drought tolerance, are the key factors underlying the response and adaptation of the three Syzygium tree species along the tropical forest succession.

Additional keywords: cavitation, hydraulic architecture, photosynthesis, tropical secondary succession.


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