@article{fdi:010060543,
  title = {{C}hange in water loss regulation after canopy clearcut of a dominant shrub in {S}ahelian agrosystems, {G}uiera senegalensis {J}. {F}. {G}mel},
  author = {{I}ssoufou, {H}. {B}. {A}. and {D}elzon, {S}. and {L}aurent, {J}. {P}. and {S}aadou, {M}. and {M}ahamane, {A}. and {C}appelaere, {B}ernard and {D}emarty, {J}{\'e}rome and {O}i, {M}onique and {R}ambal, {S}. and {S}eghieri, {J}osiane},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper analyzes the effect of the canopy age of {G}uiera senegalensis {J}.{F}. {G}mel on water regulation processes and adaptative strategy to drought over a period of 2 years. {T}he species is widespread in the agricultural {S}ahel. {B}efore sowing, farmers cut back the shrubs to limit competition with crops. {T}he stumps resprout after the millet harvest. {L}eaf water potential and stomatal conductance were measured in two fallows and in the two adjacent cultivated fields. {L}eaf transpiration rate and soil-to-leaf hydraulic conductance were deduced. {T}he decrease in both stomatal and plant hydraulic conductance caused by seasonal drought was greater in mature shrubs than in current year resprouts. {T}he 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. {I}n resprouts, the leaf transpiration rate stopped increasing beyond a hydraulic conductance threshold of 0.05 mol. m(-2) s(-1) {MP}a-1. {V}ulnerability to cavitation was determined on segments of stems in the laboratory. {T}he leaf water potential value at which stomatal closure occurred was -2.99 +/- {A} 0.68 {MP}a, which corresponded to a 30 % loss in xylem conductivity. {T}hanks to its positive safety margin of 0.6 {MP}a, {G}. senegalensis can survive above this value. {T}he 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 = {{A}daptation ; {E}mbolism ; {F}unctional limits ; {G}uiera senegalensis ; {H}ydraulic conductance ; {T}ranspiration rate ; {ZONE} {SAHELIENNE} ; {NIGER}},
  booktitle = {},
  journal = {{T}rees-{S}tructure and {F}unction},
  volume = {27},
  numero = {4},
  pages = {1011--1022},
  ISSN = {0931-1890},
  year = {2013},
  DOI = {10.1007/s00468-013-0852-6},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060543},
}