Table 2 Summary of regression analysis of the effects of species richness (Richness), drought, and repeated harvests on aboveground biomass yield.

From: Higher species richness enhances yield stability in intensively managed grasslands with experimental disturbance

Variable

dfnum

dfden

Wexford

Zürich

F-value

P

F-value

P

Richness level

2

32

23.3

<0.001

11.3

<0.001

Drought

1

32

122.0

<0.001

108.3

<0.001

Harvest

5

320

276.3

<0.001

182.4

<0.001

Richness × drought

2

32

2.3

0.118

1.7

0.190

Richness × harvest

10

320

1.1

0.326

4.7

<0.001

Drought × harvest

5

320

24.0

<0.001

34.7

<0.001

Richness × drought × harvest

10

320

1.0

0.435

0.7

0.710

  1. Notes: dfnum, degrees of freedom of variable; dfden, degrees of freedom of error.
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