2 
270 
Figure 1. Clustering of the 8 agro-ecological units 
for the 26 more abundant species. 
Thblel. Model for phytosociological releves analysis 
of grasslands in calcareous Burgundy. 
BuomuS QAectuS 
Lollum peaenne April 
Juncus glaucus 
all period 
Ranunculus ac/us April 
all period 
Lotus coanlculatus 
Cynosunus cats tatus June 
Casidamlnc paatcnsls 
April 
Thl^oLLum ficpcns July 
April 
Plantago media 
1 
Ranunculus A&pens 
April 
May 
Talfiollum aepens 
GRAZED 
GRASSLANDS ON TOP,MIDDLE OR 
BOTTOM 
Holcus lanatus 
June 
OF SLOPE 
June 
GRAZED GRASSLANDS ON 
BOTTOM OF VALLEYS, 
OR SLOPE BOGS, ON 
DEEP,MORE OR LESS 
MUDDY SOILS. 
Ranunculus 
acAls 
April 
Anthoxan- 
thum 
odofiatum 
May 
MUDDY 
SOILS 
Caltka 
palustnis 
April 
Pcstuca 
oaundlnacca 
May 
Poa 
talvlalls 
May 
T 
VERY 
MUDDY SOILS 
© © 
GRAZED GRASS 
LANDS ON SLOPE 
MORE OR LESS 
SHALLOW SOIL, 
DRY. 
© 
GRAZED GRASS 
LANDS ON 
MIDDLE OR 
BOTTOM OF 
SLOPE,DEEP, 
MOIST SOIL 
GRAZED GRASS 
LANDS ON 
MIDDLE OR 
BOTTOM OF 
SLOPE, DEEP, 
HUMID SOIL 
GRAZED GRASS 
LANDS ON 
BOTTOM OF 
SLOPE, DEEP, 
VERY HUMID 
SOIL.