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Table 2 Linear mixed effect model results of tree regeneration density and six environmental factors which were most strongly correlated with the first three PCs (see more in "Appendix": Table 11)

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

Variables

Value

Standard Error

df

t-value

p-value

Intercept

3819.32

992.92

81

3.847

 < 0.001

L_TSF

− 21.48

64.85

81

− 0.331

0.741

L_GF

− 3.73

46.41

81

− 0.080

0.936

S_CEC

− 38.19

106.73

81

− 0.358

0.721

T_RS

− 9.02

5.68

81

− 1.587

0.116

S_clay

− 20.11

15.63

81

− 1.286

0.202

S_silt

25.63

16.11

81

1.591

0.115

  1. Acronyms of variables are defined in Table 5. 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