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Fig. 2 | Fire Ecology

Fig. 2

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

Fig. 2

Species richness (a and b), species alpha diversity (c and d), and understory green cover (e and f) graphed against predictor variables identified in NPMR analysis for wildfires in Montana, Idaho, and Washington, USA, that burned in July and August between 2003 and 2007. Both species richness and alpha diversity show a non-linear relationship with the burn severity index dNBR, with the highest richness and diversity at intermediate levels of burn severity (a through c). Abbreviations for predictor variables are: ffp = length of frost-free period (days), cc = canopy cover (%), sprp = spring precipitation (mm), dnbr = burn severity index, mat = mean annual temperature (10×°C), map = mean annual precipitation (mm). See Table 5 for model evaluations. The model surface is displayed in a red-to-black gradient: lighter colors indicate higher values and darker colors indicate lower values on the 3-dimensional surface. The vertical lines at the corners of some graphs are included to assist with reading the value on the y-axis and with seeing the 3-dimensional relationship. Areas colored in gray did not have enough data for model prediction

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