The Role of Microsite Conditions in Restoring Trembling Aspen (Populus tremuloides Michx) from Seed

Abstract

Encouraging natural regeneration of Populus tremuloides Michx (trembling aspen) from seed is a largely unexplored means for reintroducing the species into reclamation areas. We evaluated the effects of microsite (surface contour and substrate type) on aspen seedling establishment and growth on a reclaimed coal mine. The 4.6ha study site was divided into six 48m-wide strips that had 15 or 40cm capping material salvaged from a nearby forest floor added to the mine surface. We surveyed 126m long transects located in the center of each strip for microsite conditions, and the presence and height of aspen seedlings. We found that aspen seedlings generally preferred mineral-organic substrates and concave microsites. To facilitate the regeneration of aspen by seed, we suggest that land managers increase small-scale roughness and microtopographic diversity on reclaimed sites. © 2014 Society for Ecological Restoration.