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Table 4 Summary of species richness and diversity measures by burn severity level for wildfire sites in Montana, Idaho, and Washington, USA, that burned in July and August between 2003 and 2007. Species richness denotes the number of species recorded at each severity level. The number of species unique to each severity class is also noted. Species diversity (Shannon’s diversity index) average is the average alpha diversity for sites within each severity class, SE denotes the standard error. Gamma diversity within a severity class is the Shannon’s index calculated for all sites within that severity class. Beta diversity represents the dissimilarity in species composition between sampling units. Letters (A, B, C) indicate statistically significant difference (P < 0.05) between burn severity classes for species diversity and richness. There was no difference in green cover between severity classes

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

Burn severity classSites(n)Species richness total (n)Species unique to class (n)Species richness (mean±SE)Alpha diversity(mean±SE)Gamma diversityBeta diversityGreen cover(mean%±SE)
Unburned171152619.2±1.7AC2.029±0.136A3.6511.62256.3±7.0
Low211672623.6±1.4AB2.379±0.064B4.0451.66670.1±4.8
Moderate321903525.6±1.5B2.316±0.069AB3.9611.64574.1±4.1
High191301621.0±1.2ABC2.171±0.081AB3.5051.33470.0±4.5
Total89270 22.9±0.82.245±0.0444.0971.85269.2±2.5