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, Volume 19, Issue 6, pp 712–721 | Cite as

Interactive effects of elevated CO2 and drought stress on leaf water potential and growth in Caragana intermedia

  • Chun-Wang XiaoEmail author
  • Osbert J. Sun
  • Guang-Sheng Zhou
  • Jing-Zhu Zhao
  • Gang Wu
Original Article

Abstract

We studied the responses of leaf water potential (Ψw), morphology, biomass accumulation and allocation, and canopy productivity index (CPI) to the combined effects of elevated CO2 and drought stress in Caragana intermedia seedlings. Seedlings were grown at two CO2 concentrations (350 and 700 μmol mol−1) interacted with three water regimes (60–70%, 45–55%, and 30–40% of field capacity of soil). Elevated CO2 significantly increased Ψw, decreased specific leaf area (SLA) and leaf area ratio (LAR) of drought-stressed seedlings, and increased tree height, basal diameter, shoot biomass, root biomass as well as total biomass under the all the three water regimes. Growth responses to elevated CO2 were greater in well-watered seedlings than in drought-stressed seedlings. CPI was significantly increased by elevated CO2, and the increase in CPI became stronger as the level of drought stress increased. There were significant interactions between elevated CO2 and drought stress on leaf water potential, basal diameter, leaf area, and biomass accumulation. Our results suggest that elevated CO2 may enhance drought avoidance and improved water relations, thus weakening the effect of drought stress on growth of C. intermedia seedings.

Keywords

Biomass allocation Canopy production index Morphology Specific leaf area Caragana intermedia 

Notes

Acknowledgements

The work was financially supported by the Knowledge Innovation Project of the Chinese Academy of Sciences (KZCX1-SW-01-12) and the Project was sponsored by SRF for ROCS, SEM. The authors are very grateful to Prof. Xin-Shi Zhang, Prof. Lian-Min Wang, and Dr. Zhen-Zhu Xu for their constructive comments and help with the research

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Chun-Wang Xiao
    • 1
    Email author
  • Osbert J. Sun
    • 1
  • Guang-Sheng Zhou
    • 1
  • Jing-Zhu Zhao
    • 2
  • Gang Wu
    • 2
  1. 1.Laboratory of Quantitative Vegetation EcologyInstitute of Botany, The Chinese Academy of SciencesBeijingP.R. China
  2. 2.Department of Systems Ecology, Research Center For Eco-Environmental SciencesThe Chinese Academy of SciencesBeijingP.R. China

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