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Table 6 Correlation of the explanatory variables to the ordination axes derived from species data by state (Kendall’s tau statistic, Ƭ) for wildfire sites in Montana, Idaho, and Washington, USA, that burned in July and August between 2003 and 2007. Explanatory variables are: elevation, index of burn severity (dNBR), transformed aspect (trasp), overstory canopy cover (cc), length of frost-free period (ffp), mean annual temperature (mat), mean maximum temperature of the warmest month (mmax), mean minimum temperature of the coldest month (mmin), mean annual precipitation (map), growing season precipitation (gsp), summer precipitation (smrp), spring precipitation (sprp), and winter precipitation (winp). Correlations in bold (Ƭ > 0.200) are shown as vectors in Fig. 3

From: Does burn severity affect plant community diversity and composition in mixed conifer forests of the United States Intermountain West one decade post fire?

  Montana fires Idaho fires Washington fires
Variable Axis 1
Ƭ
Axis 2
Ƭ
Axis 3
Ƭ
Axis 1
Ƭ
Axis 2
Ƭ
Axis 3
Ƭ
Axis 1
Ƭ
Axis 2
Ƭ
Axis 3
Ƭ
elevation 0.090 0.098 0.229 0.050 0.603 0.212 0.583 −0.150 −0.117
dNBR 0.224 −0.22 0.354 −0.018 −0.111 0.099 −0.017 0.550 0.250
trasp 0.005 −0.202 0.041 0.222 0.117 −0.145 −0.133 0.067 −0.000
cc −0.123 0.282 0.270 −0.250 −0.081 −0.125 0.117 −0.050 0.550
ffp −0.097 −0.092 0.175 −0.039 −0.575 0.270 −0.600 0.133 0.133
gsp 0.334 0.185 −0.059 −0.048 0.282 0.270 0.594 −0.142 −0.126
map 0.316 0.194 −0.079 −0.109 0.234 0.202 0.567 −0.133 −0.133
mat −0.293 −0.151 0.171 −0.008 −0.613 0.254 −0.600 0.133 0.133
mmax −0.322 −0.178 0.159 0.057 −0.558 0.259 −0.600 0.133 0.133
mmin −0.237 −0.102 0.059 −0.089 −0.574 −0.218 −0.600 0.133 0.133
smrp 0.298 0.149 −0.042 −0.081 0.410 0.304 0.600 −0.133 −0.100
sprp 0.333 0.216 −0.140 −0.129 0.125 0.145 0.594 −0.142 −0.126
winp 0.307 0.193 −0.076 −0.107 0.377 −0.071 0.517 −0.150 −0.117