Table 2).
Absolute microbial activity, based on color change in
microtiter wells that was at least 0.1 absorbance units or
0.05 units greater than the color change in the control
well, showed that microbial activity was significantly
higher in soils from the upper layer of undisturbed sites
relative to the campsites. The average number of
carbon sources utilized by soil microbes from the
surface layer of campsites was 51.5 as compared to 91.3
used by communities from undisturbed sites (Table 3).
The soil microbial community from site 7 utilized more
substrates (83) than soil communities from other