Soil Respiration
Record the Carbon Dioxide released from a sample of soil as soil respiration progresses. In addition, increase the temperature of the system and determine respiration rates for both sets of data.
Collected data illustrates very clear differences in CO2 production at different temperatures. Challenge your students to explain why they are observing this phenomenon.
Lab Summary
In this exploration, students will use a carbon dioxide gas sensor to measure the carbon dioxide (CO2) generated in a sample of soil. Since CO2 is a colorless and odorless gas, it is difficult to detect using our senses. The carbon dioxide gas sensor is a detection device that allows students to measure the CO2 produced and determine a respiration rate, from living, respiring organisms.
This activity will help students understand that soil is a living entity by exposing the biological attributes of soil. Measurement of CO2 production in soil contributes to an understanding of total “soil life”, without requiring a precise cataloging of the organisms involved.
Downloads
- Download Free Lab (PDF, 472 KB) (471 KB, .pdf)
(student version)
Method
Use the Carbon Dioxide Gas Sensor to measure the biological activity in a sample of soil.
Here's What You Need
U.S. Educator prices shown.
Probeware
PASPORT Carbon Dioxide Gas Sensor (PS-2110) - $259
Measures carbon dioxide concentration (parts per million) in gases such as air. For use with PASPORT Interfaces.
PASPORT Temperature Sensor (PS-2125) - $30
Durable stainless steel temperature sensor with a wide measurable range. For use with PASPORT Interfaces.
Xplorer GLX (PS-2002) - $349
The Xplorer GLX is a data collection, graphing, and analysis tool designed for science students and educators.
Other Materials
- Beaker, 500-mL
- Hot Plate
- Protective Gear
- Fertile soil sample (garden), 25.0 g
- Water, 250.0 mL
