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acidic soils (Eichorst et al. 2007, 2011). To determine if this relationship was signifi-
cant for other terrestrial environments, previously published sequences from a vari-
ety of soil environments were similarly analyzed. The combined datasets revealed a
significant correlation ( p < 0.004) between pH and the percentage of Acidobacteria
in subdivision 1 (Fig. 6.3A). The potential for plant polymers to influence the dis-
tribution of Acidobacteria was assessed in a molecular survey using clone libraries
(A) Acidobacteria Subdivision 1
100
80
60
40
20
0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Soil pH
(B) Acidobacteria Subdivision 4
80
60
40
20
0
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
Carbon Concentration (g C g -1 dry soil)*100
Figure 6.3 . The relationship between environmental characteristics and Acidobacteria,
one of the most abundant phyla in soils. (A) The proportion of Acidobacteria belonging to
Subdivision 1 is related to the pH of the soil environment both at KBS LTER (solid sym-
bols) and in soils worldwide (open symbols). Adapted from Eichorst et al. (2007). (B) The
proportion of Acidobacteria in Subdivision 4 correlates with soil carbon in the agricultural
and managed grassland systems at the KBS LTER. Adapted from Eichorst et al. (2011). Both
panels demonstrate how data from molecular surveys are laying a foundation for understand-
ing factors that influence the distribution of microbes in soil.
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