Abstract for CNVC00238


Populus tremuloides (Betula papyrifera) / Diervilla lonicera

Trembling Aspen (Paper Birch) / Northern Bush-honeysuckle
Peuplier faux-tremble (Bouleau à papier) / Dièreville chèvrefeuille

CNVC00238 is a boreal hardwood forest Association that ranges from Manitoba to Quebec. It has a closed canopy dominated by trembling aspen (Populus tremuloides), usually with paper birch (Betula papyrifera), overtopping a well-developed to dense shrub layer. The shrub layer includes a mix of regenerating tree species, primarily trembling aspen, balsam fir (Abies balsamea), paper birch and black spruce (Picea mariana), as well as low shrub species, such as velvet-leaved blueberry (Vaccinium myrtilloides), northern bush-honeysuckle (Diervilla lonicera) and early lowbush blueberry (V. angustifolium). The herb layer is well developed and typically includes bunchberry (Cornus canadensis), wild lily-of-the-valley (Maianthemum canadense), wild sarsaparilla (Aralia nudicaulis), yellow clintonia (Clintonia borealis), twinflower (Linnaea borealis) and northern starflower (Lysimachia borealis). The forest floor cover is mainly broad-leaf litter so the moss layer is sparse, with only minor cover of red-stemmed feathermoss (Pleurozium schreberi). CNVC00238 is an early seral condition that typically establishes after fire or harvesting. It occurs in a region with a continental boreal climate that grades from subhumid in the west to humid in the east and is usually found on mesic, nutrient-medium sites. Three subassociations are distinguished: typic, Alnus viridis and Kalmia angustifolia.