Table 2 Fertilization factorial results

From: Forb diversity globally is harmed by nutrient enrichment but can be rescued by large mammalian herbivory

 

Forb Species Richness

Forb Family Richness

Forb Cover

Grass Species Richness

Grass Cover

Predictors

Estimates

t-value; p-value

Estimates

t-value; p-value

Estimates

t-value; p-value

Estimates

t-value; p-value

Estimates

t-value; p-value

Intercept

0.01 (−0.06 to 0.08)

0.38; 0.704

−0.01 (−0.07 to 0.05)

−0.19; 0.850

0.04 (−0.11 to 0.19)

0.53; 0.594

−0.01 (−0.07 to 0.05)

−0.40; 0.689

−0.03 (−0.14 to 0.07)

−0.64; 0.525

N

−0.15 *** (−0.20 to −0.10)

−6.12;  < 0.001

−0.08 *** (−0.13 to −0.04)

−3.49;  < 0.001

−0.07 ** (−0.12 to −0.03)

−3.18; 0.001

−0.01 (−0.06 to 0.03)

−0.67; 0.503

0.08 *** (0.05 to 0.12)

4.44;  <0.001

P

−0.06 * (−0.11 to −0.01)

−2.32; 0.020

−0.01 (−0.06 to 0.03)

−0.54; 0.592

−0.01 (−0.05 to 0.04)

−0.36; 0.715

−0.01 (−0.05 to 0.03)

−0.59; 0.557

0.10 *** (0.06 to 0.13)

5.29;  <0.001

Kμ

−0.06 ** (−0.11 to −0.02)

−2.59; 0.010

−0.04 (−0.09 to 0.00)

−1.78; 0.075

−0.00 (−0.05 to 0.04)

−0.10 0.921

0.00 (−0.04 to 0.04)

0.11; 0.911

−0.01 (−0.05 to 0.02)

−0.78; 0.438

N × P

−0.00 (−0.07 to 0.07)

−0.06; 0.951

−0.03 (−0.09 to 0.04)

−0.80; 0.421

  

0.02 (−0.04 to 0.08)

0.60; 0.552

  

N  × Kμ

0.05 (−0.02 to 0.12)

1.39; 0.165

0.05 (−0.02 to 0.11)

1.44; 0.149

  

−0.00 (−0.06 to 0.06)

−0.01; 0.991

  

P  × Kμ

0.02 (−0.05 to 0.09)

0.61; 0.540

−0.03 (−0.09 to 0.04)

−0.83; 0.405

  

0.04 (−0.02 to 0.10)

1.27; 0.204

  

N × P × Kμ

−0.05 (−0.15 to 0.04)

−1.07; 0.285

−0.03 (−0.12 to 0.06)

−0.67; 0.500

  

−0.14 ** (−0.22 to −0.05)

−3.10; 0.002

  

Random Effects

σ2

0.26

0.22

0.86

0.17

0.49

τ00

0.28 block

0.23 block

0.63 block

0.24 block

0.45 block

 

0.12 site_code

0.11 site_code

0.25 site_code

0.09 site_code

0.23 site_code

N

6 block

6 block

6 block

6 block

6 block

 

84 site_code

84 site_code

84 site_code

87 site_code

87 site_code

Observations

13,686

13,684

13,686

14,259

14,259

  1. Mixed effects model results for the effects of fertilization by nutrient type on Forb Family Richness, Forb Species Richness, Normalized Forb Cover, Grass Species Richness, and Normalized Grass Cover. The intercept is the mean value of the unfenced and unfertilized control plots.
  2. All response variables were calculated using LRRs. The parenthetical numbers are the confidence interval. Bolded numbers indicate statistical significance. N = 89 biologically independent sites.
  3. * p < 0.05 ** p < 0.01 *** p < 0.001
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