Table 1 Community metrics for the 4 land uses: 6 indices of bacterial diversity and 7 indices of bacterial network. Different letters indicate a significant statistical difference between land uses, based on a parametric variance analysis followed by a Tukey HSD post-hoc comparison (n = 100 for each land use).

From: Biogeography of Soil Bacterial Networks along a Gradient of Cropping Intensity

Community metrics

Forest

Grassland

Crop system

Vineyards

Mean

sd

Diff.

Mean

sd

Diff.

Mean

sd

Diff.

Mean

sd

Differences

Diversity

Richness in OTUs

1,083.3

224.0

c

1,238.1

157.1

b

1,305.9

167.9

a

1,342.8

152.3

a

Shannon’s index for OTUs

5.27

0.39

c

5.41

0.32

b

5.50

0.31

a

5.57

0.23

a

Eveness for OTUs

0.18

0.04

ns

0.18

0.04

ns

0.19

0.04

ns

0.19

0.03

ns

Richness in genera

284.6

54.1

c

333.4

32.0

b

360.2

28.4

a

359.5

24.6

a

Shannon’s index for genera

4.04

0.31

c

4.19

0.21

b

4.25

0.2

a

4.26

0.12

ab

Eveness for genera

0.21

0.03

ns

0.2

0.03

ns

0.2

0.03

ns

0.2

0.02

ns

Co-occurrence network

Number of links

16,430.8

3,109.3

a

5,846.4

2,208.0

b

4,122.6

1,138.8

c

2,046.7

281.3

d

Number of positive links

12,042.4

2174.9

a

4,539.5

1,917.4

b

3,101.2

697.3

c

1,794.0

172.2

d

Number of negative links

4,388.4

1,123.6

a

1,306.8

486.5

b

1,021.4

475.8

c

342.7

115.3

d

Positive:Negative links

2.9

0.7

c

3.7

1.8

b

3.5

1.2

b

5.5

1.7

a

Connectance

0.008

0.002

a

0.003

0.001

b

0.002

0.0005

c

0.001

0.0001

d

Average path length

0.139

0.007

a

0.129

0.019

b

0.116

0.016

c

0.080

0.009

d

Average degree

16.2

3.1

a

5.8

2.2

b

4.1

1.1

c

1.0

0.3

d

  1. Letters indicate differences of values between land uses. They are provided by Tukey-HSD pairwise comparison.