Trees

, Volume 27, Issue 4, pp 1011–1022

Change in water loss regulation after canopy clearcut of a dominant shrub in Sahelian agrosystems, Guiera senegalensis J. F. Gmel

  • Hassane Bil-Assanou Issoufou
  • Sylvain Delzon
  • Jean-Paul Laurent
  • Mahamane Saâdou
  • Ali Mahamane
  • Bernard Cappelaere
  • Jérôme Demarty
  • Monique Oï
  • Serge Rambal
  • Josiane Seghieri
Original Paper

Abstract

This paper analyzes the effect of the canopy age of Guiera senegalensis J.F. Gmel on water regulation processes and adaptative strategy to drought over a period of 2 years. The species is widespread in the agricultural Sahel. Before sowing, farmers cut back the shrubs to limit competition with crops. The stumps resprout after the millet harvest. Leaf water potential and stomatal conductance were measured in two fallows and in the two adjacent cultivated fields. Leaf transpiration rate and soil-to-leaf hydraulic conductance were deduced. The decrease in both stomatal and plant hydraulic conductance caused by seasonal drought was greater in mature shrubs than in current year resprouts. The decrease in predawn and midday leaf water potentials in response to seasonal drought was isohydrodynamic, and it was greater in mature shrubs, suggesting that current year resprouts are under less stress. In resprouts, the leaf transpiration rate stopped increasing beyond a hydraulic conductance threshold of 0.05 mol. m−2 s−1 MPa−1. Vulnerability to cavitation was determined on segments of stems in the laboratory. The leaf water potential value at which stomatal closure occurred was −2.99 ± 0.68 MPa, which corresponded to a 30 % loss in xylem conductivity. Thanks to its positive safety margin of 0.6 MPa, G. senegalensis can survive above this value. The observed strategy places G. senegalensis among the non-extreme xeric plants, leading us to suppose that this species will be vulnerable to the expected increase in regional drought.

Keywords

Adaptation Embolism Functional limits Guiera senegalensis Hydraulic conductance Transpiration rate 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Hassane Bil-Assanou Issoufou
    • 1
    • 2
  • Sylvain Delzon
    • 3
  • Jean-Paul Laurent
    • 4
  • Mahamane Saâdou
    • 1
  • Ali Mahamane
    • 1
  • Bernard Cappelaere
    • 2
  • Jérôme Demarty
    • 2
  • Monique Oï
    • 2
  • Serge Rambal
    • 5
  • Josiane Seghieri
    • 2
  1. 1.Faculté des Sciences et TechniquesUniversité Abdou MoumouniNiameyNiger
  2. 2.IRD, UMR HydroSciences MontpellierUniversité Montpellier 2MontpellierFrance
  3. 3.INRA, UMR BIOGECOUniversité de BordeauxTalenceFrance
  4. 4.CNRS, LTHEGrenobleFrance
  5. 5.CNRS, CEFE-UMR DREAMUniversité de Montpellier 2MontpellierFrance

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