6.4 Buffering Capacity of Soils
Acid Deposition and Buffering Capacity of Soils
The impact of acidic deposition can depend very much on the soil type of the area. Acidic soils are affected much more quickly than a soil with a higher pH. A student of mine investigated this for her Extended Essay, collecting soils from different areas in her home country of Sweden, performing this simple experiment, and relating it to the abundant secondary data available for Sweden.
Another student took a slightly different approach and simply looked at the impact of liming (by adding calcium carbonate) on the pH of one type of soil.
This strategy can also be used to compare the soil underneath coniferous and deciduous forests.
Measuring the soil buffering capacity of soil
Measuring the utility of liming to ameliorate acid deposition
Use the methodology for soil buffering capacity but add different amounts of calcium carbonate to one soil type.
Tip: Ensure that repeats are made 5 times and either 5 soil types or 5 amounts of calcium carbonate are tested.