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Dendrologie et fonctionnement hydrique de jeunes plants forestiers en relation avec la lumière et la sécheresse édaphique

Abstract : This work had as first objective the analysis of water relations of five forest species (Fagus sylvatica, Betula verrucosa, Quercus petraea, Quercus péd onculé et acer pseudoplatanus) in relation with the irradiance. We used a conductmetre (the hydraulic methods) to measure the loss of the conductivity PLC in the side-branches (2years) for these different species. Clear differences observed between species and treatments. This gradient is strongly correlated with irradiance that branches received during the growth. Vulnerability curves for the four studied species are presented figure. We noticed a higher vulnerability for birch. The shape of the curves for the other species were very close. In each case, seedlings grown under shade presented an higher vulnerability than full light. Differences were highly significant. Differences between Psi 50% for extreme treatments (full light and deep shade) could reach 1 MPa. Xylem anatomy presents for all the studied species a high dependence with irradiance. The Oak presented the largest vessels and the weakest vessel densities globally. The impact of the luminous climate was very clean, with a gradual reduction of the diameter and the density of vessels in weak light with a clean reduction of the diameter and the density of vessels in all species.....
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Theses
univLorraine_urlFulltext :
http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0094_IBRAHIM.pdf
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https://hal.univ-lorraine.fr/tel-01746603
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Submitted on : Thursday, March 29, 2018 - 10:41:07 AM
Last modification on : Thursday, November 5, 2020 - 9:02:01 AM

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  • HAL Id : tel-01746603, version 1
  • PRODINRA : 10775

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Tharwat Ibrahim. Dendrologie et fonctionnement hydrique de jeunes plants forestiers en relation avec la lumière et la sécheresse édaphique. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10094⟩. ⟨tel-01746603⟩

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