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Table 2 Mean species richness, abundance and ecological specialization of weed communities per field:

From: A specialist-generalist classification of the arable flora and its response to changes in agricultural practices

 

a - Between cropping systems

b - Over time

 

Mo

Ro

P

1970s

2000s

P

Wilcoxon Test

      

Mean species richness

12.59

14.06

P = 0.07

16.56

9.34

P < 0.01

Mean abundance

9.56

8.11

P = 0.07

61.5

20.2

P < 0.01

Khi2 Test

Khi2 = 84.5

P < 0.01

Khi2 = 64.0

P < 0.01

Sum of occurrences for:

      

Generalist species

1129

1154

 

2180

1351

 

Intermediate species

777

485

 

676

405

 

Specialist species

429

268

 

344

99

 

Total

2959

2377

 

3200

1885

 
  1. a- in maize fields cultivated as monoculture (Mo, n = 235) and in maize-wheat rotations (Ro, n = 169) in the 2000 s,
  2. b- for the same fields over time between the 1970 s and the 2000 s (n = 158 fields).
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BMC Ecology

ISSN: 1472-6785

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