Symposi 
Specte 
C.M.Gira 
Institut Nat, 
ABSTRACT : Tl 
over a Frei 
relevés lei 
RESUME: De: 
zone-test : 
d' unités ai 
1 INTRODUC' 
Grassi ands 
of their 1< 
pond mainl’ 
complexity 
phenologic; 
formed on < 
1. Mappinc 
aerial pho' 
all 1985, B: 
2. Eval u< 
tion from 
zis and all 
and all 19f 
or MSS dat; 
The work ] 
a methodolc 
behalf of 1 
reflectanc( 
sensina dal 
2 MATERIAL 
This reseai 
qrassiands 
test-site c 
Vitteaux (< 
The area : 
with a sub 
fresh while 
Geomorphol 
by valleys 
Plateaux < 
leys and tl 
more or les 
Crops are 
grasslands 
Soils var; 
soils. The: 
are : depth 
flanks are 
soils in tl 
high water 
Data were 
ring 1980, 
1985, in 03 
tation. The 
Botanical 
sociologici 
abundancy : 
coefficienl 
Ÿ:9 '