Below an extract from the downloadable article in pdf format (see below).
Map of the vegetation of the France presented here (figure 2) is one extract, slightly modified, of the 'stories of vegetation of the Western and Northern Europe map' accompanying a double report prepared for the BRGM (default 1991 and 1992) in recent years, and which was printed in only 40 copies.
Adopted contours correspond to "vegetation floors", not upstairs' phytoclimatiques '. The more often they are borrowed from the CEC map (1987), after re-interpretation of the vegetation according to my system. but locally I took into account other documents, including UNESCO-FAO (1970) for the delimitation between SX5 and BS in the Alps and the Pyrenees, Géhu & al. (1984) for the delimitation between Cb and Cc in Britain and England, Dupias (1985) for the same problem in the Pyrenees, Géhu & Géhu – Franck (1984), supplemented by Ozenda (1994), for the expansion of forests sclerophyllous relict of the mid-Atlantic. I also used the maps of the vegetation of France at 1 / 200 000e edited by the CNRS.
Scale forced me to an extreme simplification in the mountains, and the mapping is more symbolic than real. The glaciers of the Alps are not all reported, and those of the Pyrenees, endangered, it even been downright omitted. Furthermore SX 4 could not be distinguished map of BM in Corsica, or SX 5 of BS. Finally the subalpine depleted of the Massif Central (BS) has been ignored, despite the fact that there are here and there above 1500 m.
My text of 1991 / 92 was taken after (but without the card) and synthesized in default, 1996; reference may be made to this last publication for further guidance. I limit myself here to the essential explanation for reading the mapping document. I remind however that it is of "bioclimatology", and specifically, "phytoclimatology", that is to say a climate cutting based on vegetation (which is considered here on a phytosociological basis); It is therefore well another thing vegetable description of a climate cutting prior and arbitrary, as so often found in the literature.
In the first part of the final discussion I will liken the map in figure 2 with two recent vegetation maps, built on different principles. And in the second part I will show that the distribution of many species of Orthoptera overlaps correctly this plant mapping, which helps justify it afterwards.
Article presented in this pdf file is the synthesis of a study carried out previously by B.Defaut and the single subject of volume 1 of the journal materials Orthopteriques & Entomocenotiques.
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Default B., 1996 – a story phytoclimatiques for the palaearctic domain system. Correlations between vegetation and climate parameters. Materials Entomocenotiques, 1: 5-46.
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 Default (1996: 7): "upstairs phytoclimatique is the virtual floor of vegetation, in agreement with climatic parameters, and average site conditions: moderately permeable soil, at near neutral pH, low slope (on the order of 10 °).» Upstairs of vegetation, it is real. If site corrections are non-existent, it coincides with the phytoclimatiques floor. otherwise, there is disagreement between the (expected) phytoclimatique floor and upstairs of vegetation (observed). The gap between the two gives the size of the correction.