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  • CN 62-1070/P
  • ISSN 1000-694X
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Photosynthetic Properties and Water Use Characteristics in Caragana korshinskii in Different Ages

  • Bao Jingting ,
  • Wang Jin ,
  • Su Jieqiong
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  • 1. School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. Shapotou Desert Experiment and Research Station/Key Labortory of Sterss Physiology and Ecology in Cold and Arid Regions of Gansu Province, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received date: 2015-07-14

  Revised date: 2015-08-30

  Online published: 2016-01-20

Abstract

Caragana korshinskii is widely used for sand-binding in Shapotou, Ningxia, China. Ii has adapted well to the habitat during the establishment. With the increasing age and the consumption of available soil water, the initially-planted C. korshinskii had degraded. To examine the relationship between the shrub age and the population degradation, we conducted field experiments on different-aged C. korshinskii (25-, 13- and 3-year-old) for the measurements of leaf water potential, leaf relative water content, leaf-specific apparent hydraulic conductance, photosynthetic rate and water use efficiency. We analyzed the relationships between photosynthetic properties and leaf water potential among the different-aged shrubs. The results showed that the photosynthetic capacities of young-mature and juvenile were higher than those of old-growth, while their water use efficiencies were lower compared to old-growth. The nonlinear relationships between both net assimilation rate (A) and stomatal conductance (Gs) with leaf water potential (Ψ) show that different-aged C. korshinskii plants adopt different drought response strategies. Juveniles reduce water loss through closing stomata, while older C. korshinskii plants respond to drought by adjusting WUE. Although the old-growth C. korshinskii maximized water use by increasing the WUE, the decreased photosynthesis and plant water potentials would slow the growth of plants and lead to their degradation.

Cite this article

Bao Jingting , Wang Jin , Su Jieqiong . Photosynthetic Properties and Water Use Characteristics in Caragana korshinskii in Different Ages[J]. Journal of Desert Research, 2016 , 36(1) : 199 -205 . DOI: 10.7522/j.issn.1000-694X.2015.00135

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