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Approche quantitative de la réponse écologique des espèces végétales forestières à l'échelle de la France

Abstract : The objective of this work is to assess the interest of large databases that store a large number of complete floristic and ecological relevés, in order to quantitatively investigate forest plant species ecological behaviour on large areas.
The data used in this work are extracted from EcoPlant, which has been developped at the French Instute of Forestry, Agricultural and Environmental Engineering (ENGREF, Nancy, France), to store thousands of complete phytoecological relevés (floristic relevés with precise climatic and edaphic characteristics), performed in forests from France. The definition of 54 theoretical plant species response curves with regard to pH, and the creation of artificial binary data sets of varying size to try to re-create the theoretical response curves, revealed that it was difficult to model the ecological behaviour of not frequent species in a reasonable way with logistic regression. Indeed, it is shown that 50 to 100 occurrences of a species represent a minimum threshold to accurately determine the optimum, the amplitude, and the maximal probability of the response curve with logistic regression, and this justifies the need to work with large databases.
In order to test the stability of species ecological behaviour on large areas, we compared the response of 46 forest herbs to pH between north-east and north-west France, and the response of 21 forest herbs to pH between the Vosges and the Jura mountains. In either flat or mountainous context, most plant species did not reveal strong regional differences in terms of ecological optimum or amplitude with regard to pH of the first A soil horizon. The slight observed regional differences were explained in both contexts by different competition conditions in each region. We conclude that the investigation of the ecological response can be performed on large areas like France, provided that competition conditions are not too different between studied regions.
A major feature of EcoPlant is to store edaphic and climatic information, coupled with floristic relevés performed at the same sites. The investigation of plant species ecological behaviour to both climatic and edaphic factors has been rarely performed, since most studies currently investigate the climatic behaviour of plant species. We illustrate the need to take edaphic variables into account in ecological niche and predictive distribution models for terrestrial plant species, by modelling Acer campestre L. (Field Maple) ecological behaviour and geographic distribution in French forests.
Results show the interest of large databases such as EcoPlant, that are ecologically complete, in order to increase the knowlege of the different dimensions of species ecological niche on large areas.
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Contributor : Christophe Coudun <>
Submitted on : Monday, January 9, 2006 - 9:04:23 PM
Last modification on : Thursday, November 5, 2020 - 7:00:04 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:03:11 PM


  • HAL Id : tel-00011330, version 1
  • PRODINRA : 318724



Christophe Coudun. Approche quantitative de la réponse écologique des espèces végétales forestières à l'échelle de la France. Ecologie, Environnement. ENGREF (AgroParisTech), 2005. Français. ⟨tel-00011330⟩



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