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Table 4 Analysis of log-response ratios \(\left( {{ \log }\frac{\text{treatment biomass }}{\text{control biomass}}} \right)\) for treatment effects in spring 2010 and summer 2009 (see Fig. 3). See Table 2 for explanation of symbols

From: No consistent effect of plant species richness on resistance to simulated climate change for above- or below-ground processes in managed grasslands

 

df

Springa

Summer

SS

F

SS

F

Explo

2

0.265

0.347n.s.

0.392

2.02n.s

LUT

2

0.250

0.327n.s.

0.260

1.34n.s

Species richnessb

1

1.77

4.77*

0.0177

0.182n.s

Explo:LUT

4

  

0.342

0.883n.s

Explo:species richness

2

  

0.0544

0.281n.s

LUT:species richness

2

  

0.764

3.94*

Explo:LUT:species richness

4

  

1.125

2.90*

Residuals

 

9.03

(df = 26)

2.42

(df = 25)

  1. Models were manually simplified until all model terms were significant. Design effects were always kept in the model. SS were computed sequentially (type I). LUT and Explo refer to land-use type and exploratory region, respectively
  2. aSpecies richness was modelled as log(species richness) in the spring analysis. Using a linear scale yielded similar, but non-significant effects of species richness
  3. bEstimate for the spring effect of log(species richness): 0.792 ± 0.363; partial model R 2adj  = 0.036