Microbial C[O.sub.2] respiration. (Junior Division).
This research was conducted to (1) quantify C[O.sub.2] respired by
soil microbes inhabiting the soil beneath Artemisia tridentata,
Bouteloua gracilis, and bare ground in grazed and ungrazed rangeland,
which is an indirect measure of microbial biomass, (2) to determine
percent carbon, percent nitrogen, and organic matter content of the
soil, and (3) determine the correlation between 1 and 2. It was found
that the microorganisms in the ungrazed rangeland emitted higher levels
of C[O.sub.2] than that of the grazed soil under A. tridentata,
specifically. The grazed rangeland showed a higher respiration rate under the bare ground and B. gracilis. Percent nitrogen and carbon
overall was higher in the grazed soil. Organic matter was found in
higher concentrations in the ungrazed soils. It was concluded that
grazing does not have a negative effect on the rangeland ecology, since
results proved that there was no significant differences in percent
carbon, percent nitrogen, and organic content of the soils of the two
Tyler Benton, Hi-Plains High School.