Syllabus Edition
First teaching 2015
Last exams 2025
Measuring Abiotic Components of Ecosystems
Written by: Alistair Marjot
Reviewed by: Bridgette Barrett
Measuring Abiotic Components of Ecosystems
Abiotic Component | Measurement method | Strengths | Limitations |
---|---|---|---|
Light Intensity | Light-meter | Quick and easy to use, non-invasive, accurate and precise measurement if direction and angle of use is consistent over repeats | Can only measure at a single point, doesn't measure spectral quality or light direction, affected by shading, cloud cover and atmospheric conditions |
Temperature | Thermometer | Simple and easy to use, highly accurate if using an electronic thermometer (temperature probe), which can measure temperature of air, water and varying soil depths | Can only measure at a single point, doesn't measure temperature fluctuations over time (unless used alongside a datalogger) |
Wind Speed | Anemometer | Quick and easy to use, non-invasive, accurate and precise measurement if direction and angle of use is consistent over repeats | Gusty conditions can lead to large variations in data |
Dissolved Oxygen | Oxygen-meter | Can measure changes over time if used alongside a datalogger | Can be expensive and require calibration, can be affected by temperature and salinity, or contaminated by oxygen in air if correct procedure not followed |
Flow Velocity | Flow-meter | Provides accurate measurements and can be attached to a datalogger | Water flow can fluctuate greatly due to rainfall or ice melt, can be affected by turbulence or eddies |
Turbidity | Secchi disc | More accurate if used in shady areas of water | Sun glare and reflections reduce visibility of disc, measurements are subjective, alternative more sophisticated optical equipment (e.g. nephelometer or turbidimeter |
pH | pH meter or pH probe | Soil pH can also be measured (using a soil test kit) | Requires calibration, affected by surrounding environment |
Soil Moisture | Evaporate water or soil moisture probe | Fairly inexpensive (although requires use of an oven) | Time consuming, organic soil content may be burned off during heating, reducing soil weight and giving inaccurate readings |
Last updated:
Did this page help you?