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Indicator Type: Environmental Condition
This indicator shows pH data collected at six sites in forested areas in Alberta. This information was collected for a long-term soil acidification monitoring program. The program was initiated in 1981 at sites with soils that are sensitive to acid deposition. These sites are used to warn of soil acidification that may affect a broader area. The indicator shows trends in pH levels in surface soils over a time frame of more than 20 years.
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Trend: Increasing soil acidity
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What does the indicator show?
The indicator shows a slight downward trend in pH over more than 20 years of monitoring shallow soil (0-2 cm beneath the surface). Soils at this depth show the greatest response to acid deposition. At most sites, the soil pH is still above 4.5. However, the most recent sampling from the Fort McMurray site showed average pH levels to be just under 4. The pH level at which the intensity is great enough to cause damage is considered to be 3.7. The Fort McMurray region is an area of the province with significant emissions of acidifying compounds. Extensive soil and vegetation monitoring by industry is also under way through the Wood Buffalo Environmental Association .
For other trends related to soil acidification, refer to these indicators: the base cation to aluminum ratio and the base saturation percentage of the soil.
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Why is this indicator important?
Soil acidification monitoring is used to identify trends in soil pH and other related matters that can have an impact on vegetation growth. Increasing oil and gas activity, other industrial development and power generation in Alberta increase the amount of acidifying emissions. These emissions have potential to significantly affect sensitive soils. Fortunately, most of Alberta's land base is moderately well buffered against soil acidification. However, some areas have very sensitive soils, which can be significant affected.
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What actions are being taken?
This indicator is used as an early warning system for measuring the effects of acid deposition. It helps identify areas of sensitivity and areas where further management of acidic emissions is required. The information is then used for mapping the risk of soil sensitivity for the Acid Deposition Strategy. This information, in turn, is used to establish restrictions on industrial emissions. This is particularly important in areas of the province where cumulative industrial development can result in increased regional emissions of acidifying compounds.
Other monitoring for acid deposition and its effects is ongoing in Alberta. The wet deposition monitoring program is one example. Various provincial, industry and airshed monitoring initiatives are also under way.
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Links to additional information
Soil pH and Plant Nutrients
Acid Rain
Acidifying Precipitation in Alberta
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Feedback
E-mail the SOE Coordinator: SOE.Coordinator@gov.ab.ca or complete this short on-line questionnaire to provide your feedback: http://www.zoomerang.com/
survey.zgi?p=WEB224DW6P3E2K.
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