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

1000
A)
Total weed density (plants m -2 , log scale)
B)
Mean number of species
C)
Ratio richness/abundance
100
10
1
14
12
10
8
6
4
2
0
1
0.8
0.6
0.4
0.2
0
1/9/06 1/1/07 1/5/07 1/9/07 1/1/08
Time
1/5/08 1/9/08 1/1/09 1/5/09
81
Crop treatment
T2 Med Aut C-
T4 Med Aut C+
T5 Med Spr C+
T6 Dac Spr C+
T7 Dac Aut C+
T8 Dac Aut C-
T9 WB T+
T10 WB T-
T11 WB T+M
Fig. 12: Development of emerged weed densities (plants per m 2
) (A), emerged weed species richnesses (B), and
richness/abundance ratios (C) in nine crop treatments.
Med, Medicago sativa (green circles); Dac, Dactylis glomerata (blue rhombi); Aut, autumn sown perennial crops
(continuous—traits); Spr, spring-sown perennial crops (broken----trait, symbols filled with grey); C+, 5
cuts/year; C-, 3 cuts/year (small symbols filled with yellow); WB, succession of annual crops (wheat-barley)
(triangles); T+, with soil tillage after cereal harvest (red triangles); T-, without soil tillage after harvest (small
orange triangles filled with grey); M, mustard intercrop (pink triangles filled with blue); see Table 6 for more
details on the nine crop treatments.