Establishment, expansion and regeneration of aspen (Populus tremula) in the Torneträsk area, subarctic Sweden, supplement to: Van Bogaert, Rik; Jonasson, Christer; De Dapper, Morgan; Callaghan, Terry V (2010): Range expansion of thermophilic aspen (Populus tremula L.) in the swedish Subarctic. Arctic, Antarctic, and Alpine Research, 42(3), 362-375

Rik Van Bogaert, Christer Jonasson, Morgan De Dapper & Terry V Callaghan
In subarctic Sweden, recent decadal colonization and expansion of aspen (Populus tremula L.) were recorded. Over the past 100 years, aspen became c. 16 times more abundant, mainly as a result of increased sexual regeneration. Moreover, aspen now reach tree-size (>2 m) at the alpine treeline, an ecotone that has been dominated by mountain birch (Betula pubescens ssp. czerepanovii) for at least the past 4000 years. We found that sexual regeneration in aspen probably occurred...
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