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Evaluation et homologation de variétés issues des vergers à graines de l'Etat - Programme 2011. Rapport final

Abstract : This report shows the work done in 2011 by Irstea, INRA, ONF and CNPF in the framework of a research programme dedicated to improved varieties testing. It includes six species (Douglas-fir, larch, Black and Scots pines, wild cherry, ash) and a transversal topic (remote detection). With regard to Douglas-fir, the four partners continued the establishment of a network of comparative trials including the 8 French seed orchards and a control from the natural range. With two new trials, the network is now composed of 17 experimental plots and 10 demonstration plots. On the whole, survival is satisfactory. Most of the improved varieties show a better initial growth than the control. Still, the Californian variety is characterised by a slow growth in every site. Moreover, all the orchards have been ranked for timing of bud flushing. Ranking the varieties for cold hardiness in autumn will be the next step. Research has begun in 2011 in that respect. In larch, INRA studied the interest of IR spectrométry for larch taxa identification. The results obtained in 2011 on needles are encouraging. Furthermore, Irstea analysed the performances of hybrids and pure species individuals in the progenies of four "hybrid" varieties. Simulated thinnings show that the stand will become richer in hybrids if the trees are selected for growth. However, the final percentage of hybrid will depend on the variety. On the other hand, hybrid percentage will remain the same if the preference is given to stem form. Concerning remote sensing, Irstea work has focused on image segmentation. Several experimental plots and orchards have been analysed.
Keywords : DOUGLAS
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https://hal.inrae.fr/hal-02597039
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Submitted on : Friday, May 15, 2020 - 10:05:20 PM
Last modification on : Wednesday, November 17, 2021 - 2:52:04 PM

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  • HAL Id : hal-02597039, version 1
  • IRSTEA : PUB00035417

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Gwenaël Philippe, Patrick Baldet, S. Matz, Frédérique Santi, Brigitte Musch, et al.. Evaluation et homologation de variétés issues des vergers à graines de l'Etat - Programme 2011. Rapport final. [Rapport de recherche] irstea. 2012, pp.174. ⟨hal-02597039⟩

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