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Ecological Processes

Table 1 Results of general linear models testing the effects of grazing intensities on forb, grass and total percentage cover, Shannon diversity and total biomass

From: Grazing effects on vegetation dynamics in the savannah ecosystems of the Sahel

 

Df

Deviance/Sum Sq

Mean Sq

LR Chisq/F value

p value

Percentage of forb cover

     

 Grazing intensity

3

50.11

 

420.3

< 0.001

 Residuals

 

9.58

   

Percentage of grass cover

     

 Grazing intensity

3

50.21

 

437.1

< 0.001

 Residuals

 

9.26

   

Total percentage cover

     

 Grazing intensity

3

17.23

 

80.6

< 0.001

 Residuals

 

9.50

   

Shannon diversity

     

 Grazing intensity

3

7.43

2.48

20.79

< 0.001

 Residuals

95

11.31

0.12

  

 Shapiro–Wilk test (W = 0.98;

p = 0.525)

Total biomass

     

 Grazing intensity

3

9.59

3.19

23.61

< 0.001

 Residuals

95

12.88

0.14

  

 Shapiro–Wilk test (W = 0.97;

p = 0.105)

  1. Df: degrees of freedom: sum Sq: sum of squares; Mean Sq: mean square; LR Chisq: likelihood ratio Chi-square
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