The soil pH under 20 coniferous plantations on abandoned farmland at the Petawawa National Forestry Institute was remeasured after 46 years and showed a significant decrease. Soils under white spruce (Piceaglauca (Moench) Voss) showed the greatest degree of acidification, with the average pH in 13 plantations decreasing by 1.28.
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Brand et al. (1986) studied this question.
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