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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