Table 1 Results of Z-test in comparing effects of nitrogen (N) on plant and any group of soil biota based on Fig. 1

From: Global nitrogen enrichment impacts plant diversity more than soil bacterial and fungal diversity: a meta-analysis

Comparison

Biodiversity index

Overall dataset

Ecosystem types

Climate Zones

Forest

Grassland

Tropical

Temperate

Boreal

Z

P

Z

P

Z

P

Z

P

Z

P

Z

P

Plant vs. soil bacteria

Shannon index

2.87

0.004

0.70

0.480

2.92

0.004

1.78

0.070

0.99

0.320

4.48

<0.001

Richness

8.06

<0.001

1.77

0.080

5.00

<0.001

1.19

0.240

7.81

<0.001

1.97

0.050

Plant vs. soil fungi

Shannon index

3.40

<0.001

1.08

0.280

3.28

0.001

1.67

0.099

1.36

0.170

5.62

<0.001

Richness

17.53

<0.001

5.36

<0.001

13.87

<0.001

4.06

<0.001

15.63

<0.001

6.86

<0.001

Plant vs. soil nematodes

Shannon index

0.40

0.690

0.59

0.550

0.39

0.700

1.11

0.270

1.38

0.170

NA

NA

  1. The Z value with a P < 0.05 or P < 0.10 (two-sided test) indicates significant or marginal significant difference in N effects between plants and soil biota.
  2. NA not applicable.
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