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Etude taxonomique des chênes de la forêt domaniale de La Harth (Haut-Rhin) : Dépérissement forestier en vallée du Rhin

Abstract : Oaks species among Quercus robur. Q. petraea, Q. pubescens have been identified through leaf morphology analysis on 69 plots from the Ecological Survey Network of the Harth Forest (Alsacian plain). For each of the 7000 leaves (10 leaves per tree. 10 trees per plot) . . about 30 parameters have been measured and 30 other variables have been computed. Pilosity has also been described (length. density) on twigs of the current year. Statistical multivariable analysis of the data has been performed mean variables computed on 10 leaves and 5 twigs variables per tree. Leaf morphology analysis has lead to a good separation of two oak populations. Q. robur (39% of the sampled trees) and the others, including Q. petraea and Q. pubescens (61%). On the other hand, Q. petraea and Q. pubescens form a continum without any clear distinction between the 2 species. Only few trees have been identify like Q. pubescens oaks on the studied oaks from the Harth Forest. Plots generally included a mixture of species and very few mono specific stands have been found. Spatial distribution of the 3 species was not homogeneous and pedonculate oaks were mainly located in the North part of the forest. The few plots including pubescent oaks were located either in the farthest North or farthest South of the forest. This spatial pattern of the 3 oak species were poorly explained by ecological condition. Pedonculate oaks were randomly distributed and especially without any correlation with local soil water capacity. It was frequently found on carbonated soils and in coppice with standards. This sylvicultural practice is actually mainly applied in the North part of the forest. Pubescent oaks have been identify either on dry sites in the North or on sites with high extractable water in the South. They were never found in pure stands and were mixed with sessile or pedonculate oaks. Tree vitality has been analysed in accordance with oak species from the observations of the National Forest Office. Difference among species has been found neither for the intensity 0 f caterpillar defoliation nor for the presence of Collybia jiLssipes. But crown condition (DEPEFEU assessment), integrating tree vitality over the past few years, was significantly worse for pedonculate than sessile oaks
Keywords : CHENE
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Submitted on : Sunday, June 7, 2020 - 1:59:39 PM
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  • HAL Id : hal-02840255, version 1
  • PRODINRA : 33243



Nathalie Bréda, Jean-Luc Dupouey, Marianne Peiffer. Etude taxonomique des chênes de la forêt domaniale de La Harth (Haut-Rhin) : Dépérissement forestier en vallée du Rhin. [Contrat] 1998. ⟨hal-02840255⟩



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