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Presented study documents the effects of green alder (Alnus alnobetula [Ehrh.] C. Koch) on the uppermost forest soil layers in mountain areas, respectively in the top part of the Orlické hory Mts. Three variants effect to the forest soil have been studied: pure groups of green alder, pure groups of Norway spruce and Norway spruce stand under-planted by green alder. The effect of alder stands litter influenced some basic soil characteristics: the surface humus accumulation (low), the bases content and base saturation (decreased). The green alder increased the acidification trends in the forest soils of the humus forms on the studied locality and intensified the mineralization and nutrient losses from the soil profile.

Green alder effects on the forest soils in higher elevations