Skip to main content

Table 4 Mixed effects logistic regression model coefficients (standard error in parentheses), raw output from glmer {lme4}, R version 3.5.2. P values denoted with asterisks (** <  0.01, * <  0.05, . < 0.1), alpha level 0.10

From: Predisposing factors’ effects on mortality of oak (Quercus) and hickory (Carya) species in mature forests undergoing mesophication in Appalachian Ohio

Variable White Oak Chestnut Oak Northern Red Oak Black Oak Pignut Hickory
Intercept −1.128 (±3.995) −0.844 (5.761) −17.087 (±6.142)** −12.183 (±18.762) 2.420 (±6.837)
Basal area of tree 1990s (m2∙ha−1) − 0.148 (±0.124) − 0.171 (±0.188) − 0.264 (±0.160) −0.386 (±0.295) 0.802 (±0.502)
Basal area of plot 1990s (m2∙ha− 1) −0.087 (±0.048). 0.087 (±0.046). 0.045 (±0.048) −0.127 (±0.110) 0.141 (±0.077).
Age (years) 0.015 (±0.020) 0.000 (±0.021) 0.055 (±0.025)* 0.022 (±0.038) −0.034 (±0.029)
Depth of solum (centimeters) −0.014 (±0.011) 0.020 (±0.024) −0.058 (±0.023)* −0.027 (±0.025) 0.019 (±0.013)
B horizon acidity (pH) 0.368 (±0.492) −0.610 (±0.723) 0.958 (±0.576). 3.241 (±3.387) −1.272 (±0.907)
Slope percent 0.018 (±0.019) −0.026 (±0.026) 0.025 (±0.025) −0.016 (±0.029) −0.011 (±0.027)
Slope aspect (cosine-transformed, TASP) −0.067 (±0.850) 0.223 (±0.889) 4.515 (±1.720)** 0.086 (±1.652) 0.891 (±1.256)
Slope position (prop. distance to ridge, PDR) 0.493 (±1.973) −2.641 (±3.408) 12.750 (±4.524)** −1.609 (±3.434) −1.404 (±2.769)
TASP:PDR −1.807 (±1.684) 0.820 (±2.25) −8.266 (±3.266)* −0.344 (±3.353) 2.638 (±2.740)