[EBOOK] Measuring Soil Microbial Activity, Published by Great Lakes Bioenercy Research Center

This activity examines how soil microbes, such as bacteria and fungi, are involved in carbon cycling. Students design experiments to explore the relationship between microbial respiration rates and soil variables such as temperature, habitat, soil type, and agricultural management choices. Four methods for measuring CO, released from soil are provided, one in the field (CO, probe), and three in the lab (CO; probe, bromothymol blue (BTB) and acid base titration).

Activity time varies by technique and experimental design. The entire activity takes approximately three-seven 50-minute class periods spread out over a one to two week period.

Learning Outcomes: Students will...

•Describe the role soil microbes play in the carbon cycle.

•Recognize and describe factors which affect the respiration rate of soil microbes, including oxygen and water levels in the soil, temperature, and availability of digestible detritus.

•Design, conduct and analyze an experiment to measure CO, emissions from soil under different conditions.

•Describe the movement of carbon through a field ecosystem, including above and below ground components.

•Explain how laud management practices (tilling, fertilization, etc) and different plants (prairie, grass, etc) have an effect on carbon cycling.

This lesson assumes prior knowledge in the components of experimental design, data collection and basic statistics, cellular respiration, the carbon cycle, and the relationship between increased atmospheric CO, and climate change.

[EBOOK] Measuring Soil Microbial Activity, Published by Great Lakes Bioenercy Research Center

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