Figure 2.

Effects of substrate addition upon dominant soil bacterial populations in vegetated and bare soils. Two-dimensional NMDS ordination analysis of bacterial T-RFLP data from soils incubated with ¹³C-labeled glucose, glycine, and phenol, and the water control treatments at 0, 24, 72, and 193 h. Differences in the relative abundances of Alphaproteobacteria and Acidobacteria T-RFs were found to account for the majority of differences between vegetated and bare soil communities. Bacterial communities from vegetated and bare soils are denoted by black and gray symbols, respectively.