Diversifying crop rotations with temporary grasslands - Université de ...

A) France B) Study site
~1000 km
Percentage of surface
Fig. 9: A) Geographic position of the study region in Year western France, B) map of crops grown at the study site in
2008, C) the ‘star’ configuration of the 32 vegetation relevés in each field centre, D) temporal development of
the principal crops on the study region from 1995 to 2008.
Figures B and D are reproduced from a slideshow presented by Vincent Bretagnolle at the final ECOGER
meeting 24-25 March 2009 18
B.I.3 Statistical analysis
For each analysis, the numbers of fields in the different field categories were set according to
the frequencies in the study area. Only the group of wheat fields following perennial alfalfa
was increased to improve statistical power (see Table 1 in Article 2). For both analyses, weed
18 available at http://www.inra.fr/content/download/15865/269357/version/1/file/bretagnolle.pdf and at
http://www.inra.fr/audiovisuel/web_tv/colloques/ecoger/bretagnolle.
40
30 km
D) Crops
Crop
x x x
x
x
x
C) one field
120 m