Journal of Forestry Research

, Volume 14, Issue 3, pp 197–201

Effects of water stress onHaloxylon ammodendron seedlings in the desert region of Heihe inland river watershed, Gansu Province, China

  • Liu Fa-min
  • Wu Yan-qing
  • Su Jian-ping
  • Du Ming-wu
Article

DOI: 10.1007/BF02856829

Cite this article as:
Fa-min, L., Yan-qing, W., Jian-ping, S. et al. Journal of Forestry Research (2003) 14: 197. doi:10.1007/BF02856829
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Abstract

The water relation and leaf gas exchange of saxoul (Haloxylon Ammodendron Bge, a C4 shrub) seedlings were studied under water stress in 2001. Saxoul seedlings maintained high transpiration when the soil moisture was above 11%. The seedlings were able to take up water from soil with above 6% soil water content, which was the threshold level of soil moisture for seedlings. The relationship between transpiration and potential evaporation was linear for well-watered seedlings. The decrease of soil water availability led to different degrees of down-regulation of stomatal conductance, leaf transpiration and net CO2 assimilation rate. The stomata played a relatively small part in determining the net CO2 assimilation rate for the same seedling. The relationship between net CO2 assimilation rate and transpiration was linear diurnally, and reduction scale of leaf transpiration was much bigger than that of net CO2 assimilation rate by waters tress treatments, therefore intrinsic water-use-efficiency increased. High evaporative demand increased the leaf transpiration but inhibited net CO2 assimilation rate. Because of the effect of VPD on transpiration in this region, the transpiration of well-watered and mild water stress seedlings becomes responsive to change in stomatal conductance over a wider range.

Keywords

Haloxylon ammodendron Water stress Leaf gas exchange Water relation Stomatal conductance Seedling 

CLC number

S718.43 

Document code

Copyright information

© Editorial Board of Journal of Forestry Research. All rights reserved 2003

Authors and Affiliations

  • Liu Fa-min
    • 1
  • Wu Yan-qing
    • 1
  • Su Jian-ping
    • 1
  • Du Ming-wu
    • 1
  1. 1.Cold and Arid environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouP. R. China

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