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Inter-species variation of photosynthetic and xylem hydraulic traits in the deciduous and evergreen Euphorbiaceae tree species from a seasonally tropical forest in south-western China

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Ecological Research

Abstract

The objective of the present study was to examine the functional coordination among hydraulic traits, xylem characteristics and gas exchange rates across three deciduous Euphorbiaceae tree species (Hevea brasiliensis, Macaranga denticulata and Bischofia javanica) and three evergreen Euphorbiaceae tree species (Drypetes indica, Aleurites moluccana and Codiaeum variegatum) from a seasonally tropical forest in south-western China. The deciduous tree species were more vulnerable to water stress-induced embolism than the evergreen tree species. However, the deciduous tree species generally had higher maximal rates of sapwood and leaf-specific hydraulic conductivity (K S and K L), respectively. Compared with the evergreen tree species, the deciduous tree species, however, possessed a lower density of sapwood and a wider diameter of xylem vessels. Regardless of leaf phenology, the hydraulic vulnerability and conductivity were significantly correlated with sapwood density and mean vessel diameter. Furthermore, the hydraulic vulnerability was positively correlated with water transport efficiency. In addition, the deciduous tree species exhibited higher maximal photosynthetic rates (A max) and stomatal conductance (g max), but lower water use efficiency (WUE). Interestingly, the A max, g max and WUE were strongly correlated with K S and K L across the deciduous and evergreen tree species. These results suggest that xylem structure, rather than leaf phenology, accounts for the difference in hydraulic traits between the deciduous tree species and the evergreen tree species. Meanwhile, our results show that there is a significant trade-off between hydraulic efficiency and safety, and a strong functional correlation between the hydraulic capacity and gas exchange rates across the deciduous and evergreen tree species.

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Acknowledgments

This study was funded by the National Science Foundation of China (project no. 90302013). The authors thank Zhi-Hui Liu, Xue-Wei Fu, Jin-Yu Liu and Hong Ma for their experimental assistance. The authors also thank Guang-You Hao and Pei-Li Fu for their helpful comments on the manuscript.

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Authors and Affiliations

  1. Kunming Division, Xishuangbanna Tropical Botanical Garden, The Chinese Academy of Sciences, 88 Xuefu Road, Kunming, Yunnan, 650223, People’s Republic of China

    Jun-Wen Chen, Qiang Zhang & Kun-Fang Cao

  2. Graduate University of the Chinese Academy of Sciences, Beijing, 100094, People’s Republic of China

    Jun-Wen Chen & Qiang Zhang

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  1. Jun-Wen Chen
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  2. Qiang Zhang
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  3. Kun-Fang Cao
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Correspondence to Jun-Wen Chen.

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Chen, JW., Zhang, Q. & Cao, KF. Inter-species variation of photosynthetic and xylem hydraulic traits in the deciduous and evergreen Euphorbiaceae tree species from a seasonally tropical forest in south-western China. Ecol Res 24, 65–73 (2009). https://doi.org/10.1007/s11284-008-0482-4

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  • DOI: https://doi.org/10.1007/s11284-008-0482-4

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