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Fig. 3. Mean relative biomass of invasive plant species in post-fire study plots at the Buffalo Creek wildfire site amended with biosolids and adjacent unamended reference areas. Thin bars represent the standard errors of the means (n = 4). Letters above the bars indicate significant differences between treatments within a year as indicated by a Fisher's least significant difference test. Invasive species are those defined as such by USDA Natural Resources Conservation Service (2002). Reference areas were not sampled in 1998.
