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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 sites.

Tyler Benton, Hi-Plains High School.
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Author:Benton, Tyler
Publication:Journal of the Colorado-Wyoming Academy of Science
Article Type:Brief Article
Geographic Code:1USA
Date:Apr 1, 2002
Words:171
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