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Table 3 Linear mixed effect model results of tree regeneration density and the first three principal components

From: Tree regeneration characteristics in limestone forests of the Cat Ba National Park, Vietnam

Variables

Value

Standard Error

df

t-value

p-value

Intercept

3220.53

363.098

80

8.870

 < 0.001

PC1

− 88.09

54.555

80

− 1.615

0.110

PC2

− 127.70

71.060

80

− 1.797

0.076

PC3

− 75.87

81.576

80

− 0.930

0.355

PC1:PC2

10.77

32.874

80

0.328

0.744

PC1:PC3

− 79.89

41.627

80

− 1.919

0.058

PC2:PC3

7.55

42.768

80

0.177

0.860

PC1:PC2:PC3

− 0.90

21.475

80

− 0.042

0.966

  1. PC1 = light availability gradient, PC2 = soil fertility, rock surface, soil moisture, and pH gradient; PC3 = soil texture gradient. Given are the estimates (Value) and the respective standard error, the degrees of freedom (df), the t-value of each variable, and its significance (p-value). Significance was assumed with p < 0.05