Skip to main content
. 2024 Apr 1;7:395. doi: 10.1038/s42003-024-06076-x

Table 2.

Multiple stepwise regression models of the relationship between vertical structural complexity and environmental variables for five vegetation types on the Tibetan Plateau

Height-maxa Height-var Height-even
Forest Pc VIFb R2 P VIF R2 P VIF R2
AI ˂0.001 1.136 0.352 0.43 AI ˂0.001 1.347 0.398 0.589 AI ˂0.001 1.221 0.104 0.229
Wind 0.003 2.546 0.051 MAT ˂0.001 4.972 0.099 UR ˂0.001 1.107 0.032
MAT 0.057 2.713 0.027 pH 0.117 1.28 0.021 Tdiurnal 0.114 1.329 0.019
UR 0.037 1.4 0.012 Wind ˂0.001 1.316 0.074
PO2 0.002 5.343 0.059
Shrublands P VIF R2 P VIF R2 P VIF R2
AI 0.001 2.874 0.603 0.861 AI 0.025 1.987 0.403 0.538 AI 0.001 1.726 0.669 0.854
Wind 0.012 2.234 0.18 Wind 0.083 1.987 0.135 Tdiurnal 0.012 1.46 0.151
pH 0.204 2.792 0.078 SOC 0.235 1.224 0.034
Alpine meadow P VIF R2 P VIF R2 P VIF R2
PO2 ˂0.001 1.86 0.151 0.408 MAT ˂0.001 3.445 0.350 0.664 Wind ˂0.001 1.06 0.11 0.127
Wind ˂0.001 4.133 0.110 Wind ˂0.001 4.122 0.231 SOC 0.098 13.03 0.007
Tdiurnal ˂0.001 1.296 0.074 PO2 ˂0.001 1.858 0.065 TN 0.102 13.164 0.006
MAT 0.115 3.495 0.049 AI 0.06 1.81 0.018 pH 0.161 1.114 0.004
AI 0.095 2.221 0.018
pH 0.074 1.107 0.007
Alpine steppe P VIF R2 P VIF R2 P VIF R2
Tdiurnal ˂0.001 1.163 0.39 0.477 MAT ˂0.001 2.536 0.233 0.506 TN ˂0.001 1.171 0.083 0.194
AI 0.124 1.229 0.058 Wind ˂0.001 3.629 0.186 MAT ˂0.001 1.005 0.071
Wind ˂0.001 1.163 0.029 PO2 ˂0.001 2.074 0.044 UR 0.032 1.166 0.04
AI 0.008 1.269 0.023
SOC 0.037 1.175 0.019
Alpine desert grasslands P VIF R2 P VIF R2 P VIF R2
Tdiurnal ˂0.001 1.362 0.205 0.33 Wind ˂0.001 1.893 0.174 0.445 Wind 0.058 - - 0.046
Wind 0.008 1.168 0.111 UR ˂0.001 1.534 0.151
AI 0.135 1.288 0.015 Tdiurnal 0.007 1.562 0.091
MAT 0.079 2.175 0.029

aHeight-max, maximum plant height within a plot; Height-var, coefficient of variation of plant height; Height-even, Shannon evenness of plant height.

bVIF variance inflation factor, MAT annual mean temperature, AI aridity index, Wind wind speed, PO2 atmospheric oxygen partial pressure, UR ultraviolet radiation, Tdiurnal diurnal temperature range, SOC soil organic carbon, TN soil total nitrogen content.

cAll models were significant at p < 0.001. R2 for each model and its independent variables are provided separately.