The pH variability of Swiss stone pine (Pinus cembra L.) and Norway spruce [Picea abies (L.) Karst.] needles
The pH measurements of Swiss stone pine and Norway spruce needles showed that quicker-than-normal loss of needles by younger sets and of law and the sets pH contributes to the acidification of forest soils. The Swiss stone pine needles had lower acidification impact on soil than the Norway spruce needles. That was due to the water extract higher pH values of about 0,5 unit. The Swiss stone pine needle pH depends mostly on the type of soil the tree grows on – the lime soils caused the needles to be more alkaline. In the conditions of mountain forests the measurements of the water extract pH values of Norway spruce needles do not seem to be an adequate indicator of the degree of air pollution.
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