Fig. 4: Comparison of relative abundance and relativized carbon (C) use of soil bacterial genera. Points show relative contributions from individual bacterial genera.
From: Nutrients cause consolidation of soil carbon flux to small proportion of bacterial community
Values are averages across soil replicates from four ecosystems (mixed conifer forest, ponderosa pine forest, piñon pine-juniper scrubland, and desert grassland) and amended with either water (Control, labeled with 18O), glucose (C), or glucose and [NH4]2SO4 (C + N) (n = 3 experimental replicates). a Comparison of the relative abundance and relativized C use of the top 36 most abundance genera. Colors correspond to bacterial phyla (six phyla accounted for >99% of C flux). Symbols correspond to the metric being compared for each taxon (relative abundance of 16S rRNA gene amplicon sequences, relativized use of soil C, or relativized use of native soil C excluding added glucose). b Comparison of relative abundance and relativized C use across all genera. Trend lines show best fit from a linear mixed model accounting for differences between ecosystems and bacterial genera. Asterisks represent significant differences of slopes from the 1:1 line (two-sided unadjusted t-tests; C:Control t287 = −0.60 ± 0.06 (std error), p = 0.548, effect-size r = −0.0007; C + N:Control t489 = 2.42 ± 0.06, p = 0.016, effect-size r = 0.012). c Comparison of relativized glucose use and relativized native soil carbon use across all genera, with variance (var) around trend lines included. Asterisks represent significant differences in variance in C + N soils compared to C soils (F22,770 = 3.53, p < 0.001, Cohen’s d = 0.134).
