Abstract
Three-year-old Pinus sylvestris were planted in either a podsol or an oligotrophic brown earth in polyethylene bags. Trees in each soil were exposed to 143 μg m −3 SO 2 or filtered air for 18 months. Mean Relative Growth Rate was 14% lower in SO 2 treatments than in filtered air and 12% lower on the podsol than on the brown earth, but there was no significant interaction between gas treatment and soil type. SO 2 decreased stem diameter but this effect was detected only after a year's treatment. The total dry weight of needles produced in 18 months was less on the podsol than on the brown earth, but was not affected by fumigation. On the other hand, SO 2 accelerated senescence which was the same on both soils. There was little effect of soil type on mineral composition of foliage at the end of the experiment, but age and gas treatment had major effects, with strong gas/age interactions. SO 2 decreased N and P concentrations of older needles and increased K, Ca, Mg and S. The increase in cation concentration was approximately equivalent to the increased sulphur concentration caused by exposure to SO 2. It is concluded that under the conditions studied, the effects of soil type and gas treatment are additive.
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